Thermal Gas Systems HALOGUARD II, Instruction Manual, Page: 8 / 13

Rev 1.4 09/13/16
8
2. The Haloguard
TM
should be powered up (operated continuously) for 24 hours before
calibration.
Remove Alarm Set point Jumper from all active channels before beginning calibration.
3. Calibrate with a digital VOM as follows:
HALOCARBON AND LFL SENSORS “ZERO” CALIBRATION
ZERO CALIBRATION MUST BE COMPLETED FOR EACH SENSOR
(1 thru 6)
a. For CMOS sensors: With VOM on 1 VDC scale, place VOM probe on T2 (+) and T3 (-)
Test points (see Figure 3 Lower Circuit Board).
Select MAN mode with push-button, sequence to first channel. Adjust potentiometer to the
left of the terminals with screwdriver until it reads 1.0 VDC. Push ZERO. Sequence to
subsequent active channels and follow same procedure for each channel. Haloguard
TM
automatically returns to scanning mode after 2 minutes or press TEST button to start
scanning.
b. For Oxygen sensor: Locate sensor adjustment screw in sensor head cover. Adjust until
controller LCD shows normal Oxygen atmosphere (typically 20.9% - 21.0%).
c. LCD display adjustment changes brightness - Adjust potentiometer (See Figure 2 Upper
Circuit Board).
4. Alarm Set points Adjustment - (See Figure 3 - Lower Circuit Board) Place jumper on
appropriate alarm point to initiate visual and audible alarm relays.
Jumper
Settings Range Range Range
Low/High
0 - 200 0 - 300 0 - 1000
10 200 300 1000
9 180 270 900
8 160 240 800
7 140 210 700
6 120 180 600
5 100 150 500
4 80 120 400
3 60 90 300
2 40 60 200
1 20 30 100
Figure 8 - Alarm Jumper Settings
GAS
TLV-
TWA* CEIL PEL
R-11
•
1000
•
R-12 1000
•
1000
R-22 1000
•
1000
R-123 50
• •
R-134a 1000
•
1000
R-500 1000
•
1000
R-502 1000
• •
Other exposure limits are pending.
TLV-TWA = 8hr./day, 40hr./wk. avg. Short term exposures should
not exceed 3 - 5 times the TWA for more than 30 min./day.
* ACGIH Trademark.
Figure 9 - Exposure Limits
NOTE: Oxygen sensor ALARMS are preprogrammed at 19.1% (LO) and 16% (HI);
OFFSCALE ALARM - preprogrammed at 1 - 2 times full scale.
(Optional) TWA Integration, LO alarm is pre-programmed to the TLV-TWA for specified
gas.