AirTest TR-5200 Operation & Maintenance Manual

4-20 mA SENSOR / TRANSMITTER
MODEL TR-5200/TR5500
Operations & Maintenance Manual
TR5500 TR5200
COMBUSTIBLE GAS SENSOR/TRANSMITTER

INSTALLATION:

1. Locate a flat surface to mount the enclosure so that the sensor can face
downward. There is a power entry at the top.
2. Remove the cover of the enclosure by removing the 4 screws in the corners
of the TR5200, or unscrewing the lid of the TR5500.
3. Connect the electrical fittings to the enclosure and bring in the electrical
wires. NOTE: BE SURE WIRING IS DONE ACCORDING TO THE
LOCAL ELECTRICAL CODE REQUIREMENTS.
Connect the wires to the terminal block as shown on the wiring drawing.
(See Fig.1) Use 18 gauge minimum wire. It is recommended that shielded
wire be used if it is not being run in metal conduit.
4.

CALIBRATION:

The sensor/transmitter must be connected to the controller.
Allow the sensor three to five minutes to warm-up before calibrating.
1. Connect negative lead of voltmeter to test point C (YELLOW).
Connect positive lead of voltmeter to test point D (WHITE). Apply
"zero" gas to the sensor. (ambient air may be used if it is certain
there are no contaminants in the area). Adjust VR2 (ZERO) to
0.0Volts ± 0.020V.
2. Connect negative lead of voltmeter to test point A (BLACK).
Connect positive lead of voltmeter to test point E (RED). Adjust
VR4 (CURRENT) to 0.400 Volts. If an ammeter is available it is
preferable to connect it in line A1 and adjust VR4 to read 4.00 mA.
3. Refer to graph below, apply calibration gas to the sensor at a rate of
.5 LPM. Adjust VR3 (SPAN) to a voltage corresponding to the %
LEL calibration gas used. The formula below can also be used to
determine the voltage value.
In the example below, if 50 % LEL calibration gas is used, the span voltage
is 1.2 volts.
1