44-00-0297
SHERLOCK
102/202 REV. 4.1 05-02-15
42
It is recommended that infrared sensors are zero calibrated
every 6 months to insure accuracy. Most of the time push
button calibration and control calibration is all that is needed to
re zero the sensor and keep it from false alarming. Measured
gas calibration should only be necessary for testing accuracy
and if the sensor fails to pick up a leak and is suspected of being
damaged or faulty.
4) Once the measured gas testing is complete and no gas is
present and the sensor is mounted in normal conditions, do
the push button calibration once again to remove any artifi cial
readings that were introduced during measured gas calibration.
To aid in performing the maintenance schedule, remember
to write down the sensor start up date on the front of the
sensor. If it is not written down and a problem due to cali-
bration occurs, this will void the warranty.
Measured Gas Calibration - Sherlock CMOS
Sensor
To accurately calibrate the Sherlock CMOS Sensor, the Refrig-
erant Gas Sensor Calibration Kit for the particular sensor must
be used. (See 44-0166 Refrigerant Sensor Calibration for
more.)
Note:
This procedure can be used on the Standard CMOS Vent-
line Sensor (See manual 44-0163 Ventline Sensor manual for
more) and High Pressure CMOS Ventline Sensor (See manual
44-0321 High Pressure Ventline Sensor manual for more)
Kit Setup Instructions
1. Insert the tube into the fitting at the end of the chamber,
tighten the fitting until the tube is snug.
2. Remove the sensor from the wall or mounting point. Take
the front face cover off of the sensor.
3. Mounting the Sensor
a. Place the chamber on its side so that the tube comes out
from the left or right side.
b. Mount the sensor module in the chamber using the sup-
plied mouniting screw, making sure that the cable fits into the
notch at one end of the chamber.
c. Seal the chamber.
4. Take the free end of the tube and mount it onto the barbed
end of the flow regulating valve
.
Calibration Procedures.
1. Filling the Chamber
a. Mount the valve onto the 20.9% Oxygen tank. Open
the valve for 2 minutes.
b. Wait 5 minutes.
c. Open the valve again for 2 minutes.
d. Wait 5 minutes.
2. Place the controller into the Sensor Absolute Screen.
a. Press EXIT.
b. Press the DOWN arrow until the "CALIBRATE" Menu
is displayed. Press SELECT.
c. Press the DOWN arrow until you reach the "ABS X:
YYY" screen where X is the sensor being calibrated.
3. With the supplied Potentiometer Screwdriver, adjust the
potentiometer until the displayed reading is 40. If the reading
is too high or too low and the potentiometer has no effect on
the reading, open the chamber and change the position of the
set pin jumper one position lower if the reading is too high, or
one position higher if the reading is too low.
4. Conduct the Zero Calibration procedure for this partular
sensor. (See manual 44-0283 CMOS Refrigerant Gas Sensor
for more)
5) You can now test the sensor using the measured refrigerant
gas tank. Follow the Calibration procedure step 1 "Filling The
Chamber" using the span gas and record the value.
CALIBRATION
POTENTIOMETER
SET PIN JUMPER
LED
WIRING TERMINAL
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