35-3010A-13 Sample-Draw Detector • 19
4. Plug the voltmeter leads into the transmitter test points.
•
For the H
2
channel, plug the voltmeter leads into the test points on the H
2
transmitter. Plug the
positive lead into the test point labeled
TP+
; plug the negative lead into the test point labeled
TP-
.
•
For the oxygen channel, plug the voltmeter into the test points on the oxygen transmitter. Plug
the positive lead into the test point labeled
TP+
; plug the negative lead into the test point
labeled
TP-
.
5. Verify a voltmeter reading of 100 mV (± 2 mV) at the H
2
transmitter.
6. If necessary, use a small flat-blade screwdriver to adjust the H
2
transmitter’s zero pot until the
voltmeter reading is 100 mV (± 2 mV).
7. Verify a voltmeter reading of 434 mV (± 2 mV) at the oxygen transmitter.
8. If necessary, use a small flat-blade screwdriver to adjust the oxygen transmitter’s zero pot until the
voltmeter reading is 434 mV (± 2 mV).
9. For H
2
: Disconnect the sample tubing from the sample-draw detector’s inlet line. Unscrew the
regulator from the calibration cylinder.
10. Close the housing door.
Operation
Normal Operation
During normal operation, the Pilot LED will be on and the flowmeter will indicate about 1.2 SCFH.
The current gas readings will be indicated at the controller. See the controller’s operator’s manual for a
description of the reading indications.
Low Flow Alarm
If the flowrate falls below 0.6 SCFH (±0.2 SCFH), then the sample draw detector will initiate a low
flow alarm. In a low flow alarm the Fail LED will turn on and the pump will shut off. If a low flow
alarm occurs, press the pump reset switch for about 2 seconds to restart the pump and turn off the Fail
LED. If the condition continues, find the cause of the reduced flow, correct it, and restart the pump
with the pump reset switch. A flow reduction can be caused by a flow blockage, a leak in the flow
system, a malfunctioning pressure switch, or a malfunctioning pump.
NOTE:
There is no flow fail indication for this version of the 35-3010.