Introduction
1.2
WL-TX-900 Transmitter features
1.2.1 Overview
The WL-TX-900 transmitter modules have:
Two digital inputs (for volt-free contacts or devices with NPN transistor outputs)
One 0-20mA/4-20mA analogue input (with field supply for loop powered
transmitter inputs)
A thermocouple/mV input with CJC
An internal supply (“battery”) voltage measurement
An internal temperature measurement from the CJC circuit
Programmable setpoints to trigger alarms from analogue measurements
Two digital status outputs
The digital inputs can accept status (on/off) signals (like level switches) or monitor
pulsed signals (like the output from a flow meter).
The WL-TX-900 sets the digital status outputs according to the Alarm Status and the
(combined) System/Communications Status.
1.2.2 Front panel
The front panel contains the following components:
1.2.2.1 Rotary Switches
The triangle on the rotary switch indicates the current position, for example the switch
shown below is in position 1:
Note: To avoid damaging the rotary switch, use a screwdriver to change the position.
The rotary switch selects the setpoint levels on the Analog and Thermocouple inputs.
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