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RPT 301 Digital Output Pressur e Transducer User Manual K177 GE Sensing.
© General Electric Company. All rights reserved..
K177 Issue No. 3 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 oth.
K177 Issue No. 3.
RPT 301 User Manual i K177 Issue No. 3 Safety 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.
K177 Issue No. 3 ii RPT 301 User Manual Abbreviations and Symbols The following abbreviations are used in this manual. Note: Abbreviations are the same in the singular and plural.
RPT 301 User Manual ii i K177 Issue No. 3 Table of Contents 1 Introduction ................................... 1 1.1 Description ................................................ 1 1.2 Specification .............................................. 1 2 Installation .
K177 Issue No. 3 iv RPT 301 User Manual.
K177 Issue No. 3 RPT 301 User Manual 1 1 Introduction 1.1 Description The RPT 301 Digital Output Pressure Transducer measures air pressure applied to the connection port and produces an electrical output.
K177 Issue No. 3 2 RPT 301 User Manual Power supply Electrical Safety: .......................................... E N61 010 (I EC 1 010 ) as app lic abl e Voltage .............................................................. 4.5 to 32 V DC Power ....
K177 Issue No. 3 RPT 301 User Manual 3 Accessories The following items are delivered with the instrument after manufacture. User manual K177 (this publication) Calibration certificate Mati.
K177 Issue No. 3 4 RPT 301 User Manual 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.
K177 Issue No. 3 RPT 301 User Manual 5 Figure 2-2 Instrument Dimensions.
K177 Issue No. 3 6 RPT 301 User Manual Power supply The instrument is internally fused with reverse polarity and overvoltage protection. Note: The power input is transformer isolated from the logic circuits and the serial data link. The isolation voltage is 50V dc.
K177 Issue No. 3 RPT 301 User Manual 7 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.
K177 Issue No. 3 8 RPT 301 User Manual 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.
K177 Issue No. 3 RPT 301 User Manual 9 Figure 2-3 Changing the communication interface PL3 LK2 B B LK1 A B PL1.
K177 Issue No. 3 1 0 RPT 301 User Manual connect screen to connector shell screened cable computer enclosure RPT 301 Screening to ensure EMC performance Screening Make sure that the chassis connection between the control computer and the instrument is continuous.
RPT 301 User Manual 1 1 K177 Issue No. 3 3 Operation 3.1 System Operation The frequency output from the sensor is counted for a fixed number of cycles.
1 2 RPT 301 User Manual K177 Issue No. 3 Command Summary Table * Short form of the 'R<CR>' command Command Function Measurement R Return stored read ing <CR> * Return stored read.
RPT 301 User Manual 1 3 K177 Issue No. 3 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.
1 4 RPT 301 User Manual K177 Issue No. 3 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 interval.
RPT 301 User Manual 1 5 K177 Issue No. 3 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.
1 6 RPT 301 User Manual K177 Issue No. 3 Error Message Format The form of the error message: ERROR nn - where nn is a decimal number Defined error numbers are: 01 - Bad command 02 - Bad password 04 - .
RPT 301 User Manual 1 7 K177 Issue No. 3 3.6 Detailed Command Definitions Measurement Commands R - Return stored reading This command retrieves the current stored reading, as the reading is the stored and filtered (if the filter is selected) there will be no delay in the reply.
1 8 RPT 301 User Manual K177 Issue No. 3 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.
RPT 301 User Manual 1 9 K177 Issue No. 3 Set-up Commands U - Unit Set-up This command sets the units of the pressure measurement; the selection is nonvolatile.
2 0 RPT 301 User Manual K177 Issue No. 3 F - Filter Set-up This command sets the instrument reading filter coefficients. Command: F, step, average Where: step is a pressure band within which the filter operates. If the pressure steps outside this band, the filter is bypassed.
RPT 301 User Manual 2 1 K177 Issue No. 3 O - Set Communications Options This command sets the communication port parameters to match those of the control computer. Note: When changing these settings care must be taken to avoid losing communication with the instrument.
2 2 RPT 301 User Manual K177 Issue No. 3 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.
RPT 301 User Manual 2 3 K177 Issue No. 3 4 Calibration 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.
2 4 RPT 301 User Manual K177 Issue No. 3 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.
RPT 301 User Manual 2 5 K177 Issue No. 3 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.
2 6 RPT 301 User Manual K177 Issue No. 3 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.
RPT 301 User Manual 2 7 K177 Issue No. 3 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.
2 8 RPT 301 User Manual K177 Issue No. 3 5.5 Approved Service Agents Find approved agents for the servicing of Druck Instruments at: www.gesensing.com.
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