TX6351 • TX6352 User Manual
26 P5536.1600 rev B
P5536.1600 rev B 27
3.4 Connections
3.4.1 0.4 to 2 V Analogue Output
Signal
A low impedance two-wire voltage output
signal requiring a separate power supply to the
sensor.
12 V dc power can usually be derived from the
monitoring instrument being used.
The connection confi guration works well up to
5-100 m distance between the sensor and the
monitoring equipment, dependent on cabling
and sensor current consumption.
Both the signal and the power supply to the
sensor are being carried in the common 0 V
conductor so at some point – infl uenced by
the length of the cable and the resistance of
the cable cores – the current fl owing in the 0 V
conductor will impose an unacceptable voltage
error onto the signal.
This eff ect can be reduced on long distance
connections by increasing the size of the cable
cores, or even better, by running a separate
0 V conductor to power the sensor enabling
operating distances up to 1,000 m.
Alternatively, the sensor may be powered by a
suitable power source close by.
3.4.2 4 to 20 mA Analogue Output
Signal
TX6351
The output signal from terminals 1 and 2 is
a conventional 4 to 20 mA two wire current
regulated signal loop.
TX6352 (Toxic Sentro eModules only)
The output signal from terminals 1 and 2 is
a conventional 4 to 20 mA two wire current
regulated signal loop.
Electrochemical cells have very low power
consumption so the same loop can be used
to also power the sensor. No separate power
supply is needed.
Checkpoint
The TX6352 version of Sentro is NOT
suitable for fl ammable gas and infrared
Sentro eModules.
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