RKI Instruments 35-3010RKA-02 - Manual (Page 19)

35-3010RKA-02 Sample-Draw Detector • 15
6. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the
voltmeter reading is 100 mV (± 2 mV).
7. 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. In addition, the H
2
S sensor signal to the controller will be interrupted by the
sample draw detector resulting in a failure indication for the H
2
S channel at the controller.
If a low flow alarm occurs, press the pump reset switch for about 2 seconds to restart the
pump, turn off the Fail LED, and resume proper sensor signal transmission to the
controller. 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 the LEL and oxygen channels on the 35-
3010RKA-02.
Maintenance
This section describes maintenance procedures. It includes preventive maintenance
procedures. This section also includes procedures to troubleshoot the sample-draw
detector, replace components of the sample-draw detector, and adjust the low flow
setting.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure the optimum
performance of the sample-draw detector. It includes daily, monthly, and quarterly
procedures.
Daily
1. Verify that the pilot light is on.
2. Verify that the flowmeter indicates a flow rate of approximately 1.2 SCFH.
If necessary use the bypass valve or flow adjust potentiometer to adjust the flow rate
to 1.2 SCFH.
3. Verify a reading of 0%LEL for the combustible channel (100 mV at the LEL transmitter
test points), 20.9% for the oxygen channel (434 mV at the oxygen transmitter test
points), and 0 ppm for the H
2
S channel (100 mV at the amp 2 test points). Investigate
significant changes in the reading.