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78 LF-Series Flowmeters: Sensor/Transmitter Installation
Dimensions and Specifications
Table A-20 DIN transmitter digital communications
All transmitters One pair of terminals supports Modbus/RS-485 signal or SP (service port) mode.
HART/Bell 202 signal is superimposed on the primary mA output, and is available
for host system interface
• Frequency: 1.2 and 2.2 kHz
• Amplitude: 0.8 V peak-to-peak
• 1200 baud
• Requires 250 to 600 ohms load resistance
Table A-21 DIN transmitter power supply
Requires DC power
Meets Installation (Overvoltage) Category II, Pollution Degree 2 requirements
Contains an IEC 1.6A slowblow fuse
Power requirements 19.2 to 28.8 VDC, 6.3 watts maximum
At startup, transmitter power source must provide a minimum of 1.0 amperes of
short-term current per transmitter
Length and conductor diameter of the power cable must be sized to provide
19.2 VDC minimum at the power terminals, at a load current of 330 mA
Table A-22 DIN transmitter environmental limits
Ambient temperature limits Operating: –40 to +131 °F (–40 to +55 °C)
Storage: –40 to +185 °F (–40 to +85 °C)
If temperature is above 113 °F (45 °C) and you are mounting multiple transmitters,
they must be mounted at least 8.5 mm apart.
Humidity limits 5 to 95% relative humidity, non-condensing at 140 °F (60 °C)
Vibration limits Meets IEC68.2.6, endurance sweep, 5 to 2000 Hz, 50 sweep cycles at 1.0 g
Table A-23 DIN transmitter environmental effects
EMI effects Meets EMC directive 89/336/EEC per EN 61326 Industrial
Ambient temperature effect On analog outputs ±0.005% of span per °C
Table A-24 DIN transmitter hazardous area classifications
Approvals agency Classification
CSA
(1)
(1) CSA is a Canadian approvals agency that provides approvals accepted both in the U.S.A. and in Canada.
Class I Division 2 Groups A, B, C, D
Class II Division 2 Groups F and G
Class III Division 2
ATEX
(2)
(2) ATEX is a European directive.
Transmitter has no ATEX classification, and should be installed only in safe areas.
Transmitter outputs are acceptable for connecting to a sensor (II 3G EEx nA) in a
hazardous area.