GE Marine Radio RPT 301 User Manual

GE  
Sensing  
RPT 301  
Digital Output Pressure Transducer  
User Manual K177  
 
RPT 301  
Digital Output Pressure Transducer  
User Manual  
K177  
© Druck Limited 1998  
This document is the property of Druck Limited and may not, either in part or whole, be copied or  
otherwise reproduced, communicated in any way to third parties, nor stored in any Data Processing  
System, without the express written authority of Druck Limited.  
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RPT 301 User Manual  
Safety  
i
The manufacturer has designed this instrument to be safe when operated  
using the procedures detailed in this manual. Do not use this instrument for  
any other purpose than that stated. Do not apply values greater than the  
maximum value stated.  
This manual contains operating and safety instructions that must be  
followed for safe operation and to maintain the instrument in a safe  
condition. The safety instructions are either warnings or cautions issued to  
protect the user and the equipment from injury or damage. Use qualified*  
technicians and good engineering practice for all procedures in this manual.  
Pressure  
Do not apply pressure greater the maximum safe working pressure to the  
instrument.  
Electrical Safety  
This instrument is designed to be safe when using options and accessories  
supplied by the manufacturer.  
Toxic Materials  
There are no known toxic materials used in this instrument.  
Maintenance  
The instrument must be maintained using the manufacturer’s procedures  
andshouldbecarriedoutbyauthorisedserviceagentsorthemanufacturer’s  
service departments.  
Technical Advice  
For technical advice contact the manufacturer or subsidiary refer to section  
5.5.  
*
A qualified technician must have the necessary technical knowledge,  
documentation, special test equipment and tools to carry out the required  
work on this instrument.  
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RPT 301 User Manual  
Abbreviations and Symbols  
The following abbreviations are used in this manual.  
Note:  
EMC  
FS  
Abbreviations are the same in the singular and plural.  
electromagnetic compatibility  
full-scale  
IEC  
inHg  
International Electrical Council  
inch of mercury  
kg/cm2  
kPa  
mA  
kilogram per centimetre squared  
kilo Pascal  
milli Ampere  
mm  
NL, H & R  
PCB  
psi  
milli metre  
non-linearity, hysteresis and repeatability  
printed circuit board  
pound per square inch  
resonant pressure transducer  
Volt  
RPT  
V
VA  
Volt amp  
The following symbols are used in this manual  
Hazard, a warning highlighting a danger that would result in  
injury. Also a marking on the instrument referring the user to  
this publication.  
This symbol, on the instrument or in the manual, indicates a  
static sensitive component.  
This product meets the essential protection requirements of  
the relevant EEC directives. Further details of applied stand-  
ards may be found in the product specification.  
CE  
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iii  
Table of Contents  
1
Introduction ................................... 1  
Description ................................................ 1  
Specification.............................................. 1  
1.1  
1.2  
2
Installation ..................................... 4  
Mounting the Transducer ......................... 4  
Pressure Connection ................................ 4  
Electrical Connection ................................ 6  
2.1  
2.2  
2.3  
3
Operation ....................................... 11  
System Operation ..................................... 11  
Command Summary ................................. 11  
General Command Format ....................... 13  
General Reply Format ............................... 15  
Error Message .......................................... 15  
Detailed Command Definitions ................ 17  
3.1  
3.2  
3.3  
3.4  
3.5  
3.6  
4
Calibration ..................................... 23  
5
Maintenance .................................. 26  
General ...................................................... 26  
LED Indicator ............................................ 26  
Diagnostic Mode....................................... 26  
Cleaning .................................................... 27  
Approved Service Agents ......................... 28  
5.1  
5.2  
5.3  
5.4  
5.5  
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Introduction  
1
1
1.1 Description  
TheRPT301DigitalOutputPressureTransducermeasuresairpressure  
applied to the connection port and produces an electrical output. It  
comprises a resonant sensor connected to a printed circuit board to  
produce a serial digital output and is contained in a metal enclosure to  
IP65 standard. The instrument is designed to communicate with  
compatible equipment using a serial communications system which  
can be selected by the user for either RS232 or RS485 standard  
communications interface. The power supply for the instrument is a  
wide tolerance DC voltage with a low power consumption A remote  
start-up facility enables the instrument to be remotely switched on and  
off to save power.  
1.2 Specification  
Accuracy  
Non-linearity, hysteresis and repeatability:  
Standard.................................................................± 0.02% FS  
Option A.................................................................. ±0.01% FS  
Temperature affects:............... ±0.02% FS over operating temperature range  
Long term stability:  
Standard............................................. 150 ppm per 12 months  
Option A............................................. 100 ppm per 12 months  
Ranges  
.................................................................. 750 to 1150 mbar a  
.................................................................... 35 to 1300 mbar a  
.................................................................... 35 to 2620 mbar a  
.................................................................... 35 to 3500 mbar a  
Dimensions  
Weight:  
...................................................................................... 0.65 kg  
...................................................... 125 mm x 80 mm x 57 mm  
Size:  
Environment  
Operating temperature range ..................................................... -20 to + 60C  
Storage temperature range ......................................................... -40 to + 80C  
Sealing:  
........................................................................................... IP65  
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Power supply  
Electrical Safety: .......................................... EN61010 (IEC 1010) as applicable  
Voltage .............................................................. 4.5 to 32 V DC  
Power .......................... 0.6 Watts at 5 V to 0.75 Watts at 32 V  
Electromagnetic compatibility  
............................................................ EN50081-1 (emissions)  
............................................................. EN50082-2 (immunity)  
Switch on  
Settling Time: ... Less than 5 seconds (with filtering disabled)  
Pressure measurement  
Measurement cycle: ........................................ Fixed, nominally 0.5 seconds  
Reading Filter:  
Single pole low pass filter, variable time constant and step response  
Reading Resolution: ........................ Programmable number of decimal places  
Data Communications:  
Serial RS232 or RS485 (selectable)  
Software or hardware handshaking on RS232  
software handshaking only on RS485.  
Power Control  
(Remote Start-Up)  
A floating ‘volt free’ two-wire control input is provided  
to enable the instrument to be remotely switched on  
or off.  
Pressure connection  
.............................................................................. G1/8 female  
overpressure ................................... 1.25 x calibrated full-scale  
pressure containment ................................................... 5 bar a  
Pressure medium compatibility: .......................  
Dry gases compatible with:  
Glass, Silicon, Titanium, Stainless Steel and Epoxy adhesive  
Note: Continuing development sometimes necessitates specification changes  
without notice.  
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Accessories  
Thefollowingitemsaredeliveredwiththeinstrumentaftermanufacture.  
User manual K177 (this publication)  
Calibration certificate  
Mating electrical connector (if ordered)  
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RPT 301 User Manual  
2
Installation  
Installation must be carried out by a qualified technician.  
2.1 Mounting the Instrument (Figure 2.1)  
The instrument can be mounted on a vertical surface using two screws  
or bolts to a maximum diameter of 4 mm.  
Figure 2-1 Mounting Arrangement  
2.2 Pressure Connection  
The pressure port is a G1/8. If a pipe is connected to this port a bonded  
seal must be used. The instrument is very sensitive to air movement  
(small local pressure changes), when the pressure port is directly  
sensing the atmosphere, the fitting of a filter or restrictor is  
recommended.  
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Figure 2-2 Instrument Dimensions  
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2.3 Electrical Connection  
The electrical connector is a 10-way connector (MIL C26482) for serial,  
parallel and power connections.  
Instrument Connector -  
Cable Connector  
Plug, Amphenol 62GB 12E12 - 10P  
Socket, Amphenol 62GB 16F12 - 10S  
-
Communication connections  
When configured for:  
RS485  
RS232  
A
B
C
D
E
F
=
=
=
=
=
=
=
=
=
=
Power Supply -ve  
Power Supply +ve  
Chassis  
A
B
C
D
E
F
=
=
=
=
=
=
=
=
=
=
Power Supply -ve  
Power Supply +ve  
Chassis  
Data out +ve  
Data out -ve  
Data In +ve  
RTS Input  
Data Out  
CTS Output  
Data In  
G
H
J
Data In -ve  
G
H
J
Data Ground  
Start-Up -ve  
Start-Up +ve  
Data Ground  
Start-Up -ve  
Start-Up +ve  
K
K
Power supply  
Theinstrumentisinternallyfusedwithreversepolarityandovervoltageprotection.  
Note: The power input is transformer isolated from the logic circuits and the  
serial data link. The isolation voltage is 50V dc.  
For continuous operation the ‘Start-up’ connections should be connected to the  
supply, make sure the polarity is correct and the current requirements are met.  
When RS232 is used, the RTS line can be connected to the `Start-up' input and  
the RTS input on pin D so that the control computer can turn on the instrument.  
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The start-up +ve and -ve connections must be connected for the  
instrument to operate. There are many ways of connecting the  
start-up facility for example:  
Power control  
The current consumed by the instrument is approximately 1 mA at 3 V, 2 mA at  
5 V rising to 16 mA at 32 V. If necessary, when using a supply greater than 5  
V, a series resistor can be used to reduce the current drain to 1 mA.  
Connections for remote on/off control  
current limiting resistor  
for high supply voltages  
see text  
Connections for continuous operation  
7
4
Connections for remote on/off control using RS232 output  
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Communications  
The installed instrument is controlled by the serial data interface.  
Software or hardware handshaking can be used on the RS232 interface  
and only software handshaking on the RS485 interface.  
Changing the communication interface standard (Figure 2-3)  
The communication interface standard is set at manufacture to RS232  
but can be changed as follows:  
Remove the lid of the instrument to gain access to the PCB.  
CAUTION:  
THE PCB CONTAINS SENSITIVE ELECTRONIC COMPONENTS.  
Carefully connect the interface connector lead and the link LK2 in the  
following positions:  
RS232  
interface lead to PL1  
LK2 to position A  
RS485  
interface lead to PL3  
LK2 to position B  
Refit and secure the lid of the instrument.  
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LK1 LK2  
B
B
A
B
PL3  
PL1  
Figure 2-3 Changing the communication interface  
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RPT 301 User Manual  
Screening  
Make sure that the chassis connection between the control computer  
and the instrument is continuous. Use screened cable and bond the  
cable screening to the connector shell of the instrument and to the  
computer enclosure.  
computer  
screened cable  
RPT  
301  
enclosure  
connect screen  
to connector shell  
Screening to ensure EMC performance  
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Operation  
11  
3
3.1 System Operation  
The frequency output from the sensor is counted for a fixed number of  
cycles. A mid-scale pressure gives a measurement period of  
approximately 0.5 seconds. During this time a high frequency clock is  
also being counted and at the end of the measuring cycle it is this value  
which is transferred to the processor for conversion into its pressure  
equivalent.  
Measurement cycles are continuous, unless specifically interrupted  
(see the G command). Each cycle delivers a new pressure value to the  
programmable filter. The output of this filter is stored in a buffer and  
may be requested by the control computer or sent automatically at a  
programmable interval to the control computer.  
3.2 Command Summary  
The instrument has a range of commands summarised in the table and  
detailed in this section. Some of these commands generate a reply  
from the instrument, the general format of these replies is given in  
section 3.4.  
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Command Summary Table  
Command  
Function  
Measurement  
Return stored reading  
Return stored reading  
R
<CR>  
*
Get New Reading  
G
A
X
Auto send reading  
Auto send from power-up  
Set-up  
Set units  
U
F
B
O
S
I
Set filter  
Set reading resolution  
Set communication parameters  
Status  
Identity  
User calibration  
User calibration (linearity)  
C
P
Change protection PIN  
Command Terminators  
CR CRLF  
* Short form of the 'R<CR>' command  
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3.3 General Command Format  
The instrument is controlled by a sequence of single letter commands.  
Some commands require one or more numeric values to follow the  
letter, the correct number of parameters must be sent with this type of  
command. All command fields must be separated by a comma. The  
instrument accepts upper-case or lower-case letters.  
Single commands  
Single commands should be of the form:  
Command, P1, P2, ,Pn<CT>  
Where, Command is a single ASCII character, P1 to Pn are numbers in  
the form:  
(-) mmm.ddd  
or  
(-)m.ddddE(-)xx  
e.g.  
123.456 or 1.23456E02  
Example:  
Single Command  
<CT> is the command terminator (CR or CRLF)  
A,3<CR> selects auto-send mode with 3 second period  
a,3<CRLF> has the same effect  
Command Strings  
Commands can be strung together with a separating semicolon. The  
whole command string is only interpreted and actioned when a valid  
terminator is received.  
Example:  
Multiple Commands (Command String)  
1.  
O, PIN, address, baud, data bits, stop bits, parity, handshake; U, units;  
P, PIN, New PIN  
Reply: None  
This command string sets: port address (00), baud rate, units and new PIN  
.
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2.  
U, O; G; R; G; R; U, 16; G; R; G; R; G; R; A, 100  
Reply: Reading 1 mbar  
Reading 2 mbar  
Reading 3 psi  
Reading 4 psi  
Reading 5 psi  
Then at 100 second intervals - Reading psi  
This command string sets the instrument units to mbar, returns two  
consecutive readings, changes units to psi, returns three consecutive  
readingsandthenselectsauto-sendmodewithaperiodof100seconds  
between readings.  
Command String Limitations  
Auto-send mode and diagnostics mode are cancelled when a further  
command is received, this should be used at the end of a command  
string.  
Note:  
The C, L and T commands are interactive and are not  
suitable for multiple commands.  
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3.4 General Reply Format  
For commands that have a reply string, the reply terminator <RT> is  
always transmitted and is always <CR> followed by <LF>.  
<RT> is expected with all commands but only shown in some of the  
following sections for clarity (e.g.: Section 5.3 Diagnostics Mode).  
Command Terminator  
Command strings must end with the command terminator <CT>.  
For Dumb Terminal applications press the carriage return (or enter)  
key.  
With a Terminal Emulator communications application, the  
applicationmustbeset-uptogivetherequiredoutputwhenthecarriage  
return (or enter) key is pressed.  
For Custom applications, <CR> (decimal 13) or <CRLF> (decimal 13  
followed by decimal 10) must be added to the end of each complete  
command string.  
<CT> is expected with all commands except for some interactive  
commandswherefurtherexplanationisnecessary(e.g.:Section4User  
Calibration).  
3.5 Error Message  
Error messages are generated from two sources:  
a.  
b.  
The command decoder. A command error causes the return  
of an error message and stops the rest of the command string.  
The instrument sends an error message corresponding to the  
command error.  
A pressure sensor fault causes an error message to be sent.  
Serious faults block the transmission of pressure data and  
sends the error message in place of data.  
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Error Message Format  
The form of the error message:  
ERROR nn - where nn is a decimal number  
Defined error numbers are:  
01  
02  
04  
08  
16  
32  
64  
-
-
-
-
-
-
-
Bad command  
Bad password  
Bad data detected by checksum  
Data out of range  
Hardware fault  
Pressure outside range  
System not ready  
Error messages are sent when an error is detected.  
Example  
When first detected the hardware fault error is sent once even though  
the fault persists, sending the S (status) command provides further  
details of the fault.  
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3.6 Detailed Command Definitions  
Measurement Commands  
R - Return stored reading  
Thiscommandretrievesthecurrentstoredreading, asthereadingisthe  
stored and filtered (if the filter is selected) there will be no delay in the  
reply.  
Command:  
R
Reply: nnnnnnn<SP>UNITS  
Where:  
‘nnnnnnn’ is the stored reading as a floating point  
number ‘Units’ are the units for nnnnnnn (i.e. mbar,  
mH2O, psi etc.)  
G - Get reading  
This command initiates a new measuring cycle. The reading is not  
returned by this command, string ‘G’ and ‘R’ together to return the  
reading(i.e. G;R<CR>). Theinstrumentproceedstothenextcommand  
after the end of the measurement cycle (see specification for duration)  
or in the event of a reading failure (fault condition) after a time-out of  
approximately2seconds. Thecommandsynchronisesthemeasurement  
cycle with an external event.  
Note:  
Use of the G command overrides any filter that has been  
selected. The reading obtained is passed without filtering  
to the reading store.  
Command:  
G
Reply: None  
Result: Initiates new measurement cycle  
A - Auto send reading  
This command places the instrument into a mode where the value  
currently held in the reading store is sent to the control computer with  
aspecifiedintervalbetweeneachtransmission. Autosendisterminated  
by any following command.  
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Command:  
A,nnnnnn  
Where: ‘nnnnnn’ is a number between 1 and 999999. This is  
the period in seconds between successive  
transmissions.  
Reply: None  
Result: A reading is transmitted every nnnnnn seconds.  
The transmission format is the same as the reply of the  
‘R’ command.  
X - Auto Send from switch-on  
The ‘A’ command is cancelled by any following commands and is not  
restored at switch-on. If the pressure transducer continuously sends  
readings and does so even after power failure, (this includes using the  
‘shutdown’ facility) then the ‘X’ command can be used to select this  
facility. This command allows a transmission period to be stored in  
nonvolatile memory which will be automatically loaded and actioned as  
if the ‘A’ command had been sent at switch-on.  
Command:  
X,nnnnnn  
Where: ‘nnnnnn’ is a number between 0 and 999999.  
This is the transmission interval in seconds as for the  
‘A’ command. A value of 0 disables the Auto send at  
switch-on.  
Reply: None  
Result: Instrument powers up in auto-send mode with the  
selected transmission interval.  
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Set-up Commands  
U - Unit Set-up  
19  
This command sets the units of the pressure measurement; the  
selection is nonvolatile.  
Command:  
U,nn  
Where: ‘nn’ can be up to two digit number taking one of the  
following values:  
*
0
-
-
-
-
-
-
-
-
-
-
-
-
mbar  
Pa  
13  
14  
-
-
-
-
-
-
-
-
-
-
-
-
mH20  
torr  
1
2
kPa  
15  
atm  
3
MPa  
16  
psi  
lb/ft2  
4
hPa  
17  
5
bar  
18  
inHg  
6
kg/cm2  
kg/m2  
mmHg  
cmHg  
mHg  
mmH2O  
19  
inH2O04  
ftH2O04  
mbar  
7
20  
8
*21  
22  
9
inH2O20  
ftH2O20  
mbar  
10  
11  
23  
*24  
12  
-
cmH2O  
* Note:  
mbar can be selected using code 0, 21 or 24.  
Reply: None  
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F - Filter Set-up  
This command sets the instrument reading filter coefficients.  
Command:  
Where:  
F, step, average  
stepisapressurebandwithinwhichthefilteroperates.  
If the pressure steps outside this band, the filter is  
bypassed. This gives an unfiltered response to  
non-noise step changes.  
step takes a value expressed as a percentage (0 -  
100%) of full-scale.  
If step = 0 then the filter is disabled.  
average is the number of sequential readings (1 -  
99) averaged by the filter. High values effectively  
give the filter a long time-constant.  
Reply: None  
B - Set Resolution  
This command enables the decimal place of the reading to be adjusted  
within the instrument’s resolution, see specification. The reading  
resolution is automatically selected according to the instrument full-  
scale and the units that have been selected using the units set-up  
command. An algorithm is used that gives a resolution which does not  
interfere with the accuracy of measurement and is as noise-free as  
possible before filtering. The set resolution command allows the  
number of decimal places of the transmitted value to be specified, this  
overrides the automatic selection of resolution for the current selected  
units.  
Changing units cancels any previous set resolution command.  
The command is nonvolatile and remains selected until the units are  
changed. Changing and restoring the units can be used to cancel the  
set resolution command.  
Command:  
B,n  
Reply: None  
Result: Sets the transmitted number of decimal places to be ‘n’ 0-5  
max depends on units resolution.  
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O - Set Communications Options  
Thiscommandsetsthecommunicationportparameterstomatchthose  
of the control computer.  
Note: When changing these settings care must be taken to avoid losing  
communication with the instrument. If this should happen the default  
communications settings can be restored (those operational at the time  
of shipment) by moving Link 1 to the ‘A’ (Restore) position and  
switching the power off and back on. The link should then be moved  
back to the ‘B’ (Normal) position. If the link is left in the ‘A’ (Restore)  
position it is not possible to permanently change the communications  
settings; this may be considered useful in some applications. Default  
on shipment is set to the command O, 000,00,0,0,0,0,0 which means:  
9600 baud, 8 data bits, 2 stop bits, no parity, no handshake.  
Command:  
O, PIN, address, baud, data bits, stop bits,  
parity, handshake  
Where: PIN is a three-character password = 000 - 999  
address always = 00  
baud rate value = 0 - 7: 0 = 9600, 1 = 4800, 2 = 2400, 3 = 1200,  
4 = 600, 5 = 300, 6 = 150, 7 = 75  
data bits:  
stop bits:  
parity:  
0 for 8 data bits1 for 7 data bits  
0 for 2 stop bits  
1 for 1 stop bit  
0 = no parity 1 = even parity 2 = odd parity  
0 = no handshake  
handshake:  
1 = software handshake (XON/XOFF)  
2 = hardware handshake (RTS/CTS)  
Reply: None  
Note: When RS485 hardware has been selected the serial link is configured as  
full duplex with no hardware handshaking. Handshake = 2 is not valid  
for RS485 hardware.  
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S - Status  
This command returns the instrument status.  
Command:  
S
Reply:  
STATUS nn  
Where nn:  
01 = Frequency outside limits  
02 = Diode voltage outside limits  
04 = Electronics failure  
Combination errors: a status 06 represents diode  
voltage and electronics failure.  
Result:  
no change  
I - Identity  
This command requests the unit to send items of data which describe  
the unit identity.  
Command:  
Reply:  
I
type, range, S/N, cal date  
Result:  
No change in status or operation  
Where:  
Type =  
Range =  
Equipment model (Druck RPT 301)  
Pressure range, lower and upper and  
pressure type  
S/N  
Cal date =  
=
Transducer serial number  
Date of last calibration  
Command:  
I,S/PIN, Name Value<CR> format  
i.  
When Name = S, Value = nnnn/yy-mm  
Reply: S/N = nnn/yy-mm  
Result: sets displayed serial number  
ii.  
iii.  
When Name = H, Value = nnnn  
Reply: HIGH RANGE = nnn mbar  
Result: sets displayed highest operating pressure (mbar)  
When Name = L, Value = nnnn  
Reply: LOWEST RANGE = nnn mbar  
Result: sets displayed lowest operating pressure (mbar)  
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4 Calibration  
23  
The instrument is supplied with a calibration certificate. For the  
instrument to stay accurate it is recommended that it is checked every  
12 months.  
The use of a Class A compensated deadweight pressure standard is  
recommended.  
The following procedures should be carried out in a controlled  
environment by qualified personnel.  
Iftheaccuracyoftheinstrumentisnotwithinthespecification, carryout  
a calibration adjustment procedure.  
A qualified person must have attended a product training  
course given by the manufacturer or appointed agent and  
successfully completed the training course on this equipment.  
The manufacturer offers a comprehensive and, if required,  
NAMAS accredited calibration service.  
Calibration Check  
A calibration check should be carried out at chosen intervals. The  
readingsoftheinstrumentshouldbecomparedwithapressurestandard  
and, after any adjustments for accuracy (traced to National Standards),  
the differences recorded. The adjusted differences can then be  
compared with the required accuracy for the instrument. If necessary  
a calibration adjustment can be carried out.  
The recommended procedure is to check at increasing and then  
decreasing intervals of 0, 20, 40, 60, 80 and 100% of full-scale.  
C - User Calibration (Linearity/Drift Compensation)  
This command performs a `best straight line fit' to the remaining errors  
of the transducer or does a single pressure point correction. Entering  
one pressure point causes the offset between the transducer and the  
pressure standard to be added/subtracted across the whole pressure  
range. Entering two pressure points (near zero and near full-scale)  
cancelszeroandfull-scaledrift. Enteringmorepressurepointsreduces  
the remaining non-linearity and makes the zero and full-scale correction  
more accurate.  
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RPT 301 User Manual  
The calibration routine requires a minimum of two pressures within the  
operating extremes (maximum of six pressures). The instrument  
software calculates an offset and gain correction to be applied to all  
subsequent readings using a statistical best straight line method.  
For single point calibration, the gain factor is set to unity.  
Notes  
1
For the pressure sensor to rapidly respond to the applied pressure,  
disable the filter by sending the filter command F, 0,0<CR>.  
2
Before sending the ‘C’ command set the instrument to operate in the  
pressure measurement units required for calibration. i.e. U, 0<CR>  
selects mbar. Always use the same units when entering applied  
pressures.  
Command:  
Reply:  
C, PIN  
APPLY PRESSURE nn  
apply pressure, when steady send <CT>  
ENTER APPLIED PRESSURE nn  
type pressure value - decimal number followed by  
Reply:  
<CT>  
Reply:  
MORE? (Y/N)  
type Y <CT> to calibrate more points  
or  
or  
type N <CT> to complete calibration point entry  
SLOPE XX INTERSECT YY  
ACCEPT CALIBRATION (Y/N)  
Reply (if N):  
type Y <CT>  
to accept and permanently update the calibration  
type N <CT> to terminate without saving  
Reply (if N): CALIBRATION TERMINATED  
end of calibration procedure  
Reply (if Y):  
ENTER CAL DATE  
type date in the format DD/MM/YY  
CALIBRATION COMPLETE  
Where:nn = pressure point 1-6  
Reply:  
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25  
P - Change PIN  
This command changes the PIN (Personal Identification Number) that  
protects the calibration data. The instrument is shipped with the PIN  
000. If the PIN is lost, the default (000) may be restored by fitting the  
‘default’ link and switching off and then on.  
Note: Restoring the defaults restores ALL of the factory settings including the  
communication parameters.  
Command:  
Where:  
P, PIN, New PIN  
PIN is the existing 3-digit code (000 to 999) and New  
PIN is the replacement PIN.  
Reply:  
None  
Result:  
PIN is replaced by New PIN  
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RPT 301 User Manual  
5
Maintenance  
5.1 General  
User maintenance on this instrument is limited to checking the LED  
indicator, a diagnostic mode and cleaning the case.  
5.2 LED Indicator  
With the lid of the instrument removed, an LED located on the PCB  
flashes when a pressure conversion is carried out. This indicates that  
the instrument has power, that the processor is functioning and the  
transducer frequency and diode voltage are within normal limits.  
5.3 Diagnostic Mode  
D - Diagnostic Mode  
This command places the instrument into the diagnostic mode.  
Command:  
Where:  
D, mode  
mode is a single digit:  
1
2
3
4
5
Dump all 512 stored values.  
Dump transducer coefficients (checks LOAD L command).  
Dump calibration factors i.e. gain, offset etc.  
Continuous output of sensor diode voltage (temperature) mV.  
Continuous output of sensor frequency in Hz.  
Result: The reply depends on the mode as follows:  
Mode 1  
32 lines of output as follows:  
aaa - nn nn nn nn nn nn nn nn nn nn nn nn nn nn nn nn<RT>  
where: aaa = hexadecimal address offset (0 to 1FFH) and  
nn = hexadecimal data  
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Mode 2  
“K00”,Coeff 1<RT>...”K55",Coeff 25<RT>,  
”KX”,Coeff X<RT>,  
”KY”,Coeff Y<RT>,  
“CS”,RPT barometric checksum<RT>,  
“SN”,RPT serial number<RT>,  
“RH”,RPT max. operating pressure (mbar)<RT>,  
“LH”,RPT min. operating pressure (mbar)<RT>,  
“TYPE”,RPT type<RT>  
Mode 3  
Frequency constant, pressure gain, pressure offset, diode volts offset  
Mode 4  
DIODE = value - For every reading where value is the diode voltage in  
mV  
Mode 5  
FREQUENCY = value - For every reading  
Where: ‘value’ is the sensor frequency measured in Hz  
*
Modes 4 and 5 are cancelled by any other command.  
5.4 Cleaning  
Cleantheexternalcaseoftheinstrumentwithadamplint-freeclothand  
mild detergent. Make sure that there is no debris in the pressure port.  
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5.5  
Approved Service Agents  
Find approved agents for the servicing of Druck Instruments at:  
K177 Issue No. 3  
 

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