RKI Instruments PS-2 - Manual (Page 3)

1. Calibration gas cylinders at each of the alarm points.
2. Cylinder valve or regulator (desired flow rate is 0.5 liter per minute).
3. Sample tube and test cup to apply gas to sensors.
4. Small screwdrivers: (Phillips head to remove case screws and small flat blade to
make calibration/alarm adjustments).
To Calibrate/Set Alarm levels, proceed as follows:
1. Remove front cover of the PS-2 by removing the 4 corner housing screws.
2. Connect the regulator, hose, and test cup to the Alarm 1 gas cylinder.
3. Secure the test cup to the sensor and let the gas flow onto sensor for approx. 60
seconds to allow time for full response.
4. While the gas continues to flow onto the sensor, with a fine flat blade
screwdriver adjust the LOW ALARM potentiometer adjustment (located on the
right hand side of the PCB just under the buzzer). Adjust the potentiometer as
follows:
A. If the buzzer is sounding and the yellow alarm light is lit, turn the
potentiometer clockwise slowly until the yellow alarm light just goes
out. Now, turn the potentiometer counter clockwise slowly until the
alarm light (and buzzer) just goes on. Low alarm is now set.
B. If the yellow light is not lit, turn the potentiometer slowly counter-
clockwise until the yellow light just goes on. Low alarm is now set.
5. A. Disconnect the gas regulator from theAlarm 1 gas cylinder and connect
it to the Alarm 2 gas cylinder. Allow approx. 60 seconds for full
response.
B. With the gas continuing to flow, adjust the HIGH ALARM
potentiometer as described in step 4A or 4B above, while watching for
the red light to come on. (note buzzer will sound during this entire stage
because the low alarm level is exceeded).
6. When finished, remove the regulator from the gas cylinder to stop the flow,
and replace the cover of the PS-2 housing.
Fuses : The PS-2 contains 2 fuses; a 1 amp fuse for the DC circuit, and a 250 ma (1/4
amp) fuse for the 115 VAC side.Both fusesare 4 mm x 20 mm type, and are
clearly labeled on the PCB with the housing lid removed. Turn off power when
replacing fuses.
For replacement parts, calibration equipment, repairs, or other information on this
equipment, please contact RKI Instruments, Inc, 1855 Whipple Road, Hayward, CA, 94544,
Phone (800) 754-5165, Fax (510) 441-5650 or contact us by visiting our web site at
www.rkiinstruments.com.