13
A100g
JULY 2017
Maximum Power Wiring Length to a Monitor
120V
System
230V
System
Wire
Size
Maximum
Ohms/Wire
Length
Length
Ft
m
Ft
m
HLM2
200
60.9
120
40
22 Gauge
7/.2mm
3.52
500
150
300
100
18 Gauge
7/.386mm
HLM6
500
150
300
100
22 Gauge
7/.2mm
8.8
1300
430
700
230
18 Gauge
7/.386mm
TABLE 4
Note: There is a 5 minute delay before the green power
light on the gas monitor is energized. This is to allow the
Gas Sensor to stabilize and not give off false information.
The Hansen models HLM2 and HLM6 have both low level
alarm and high level alarm single pole double throw
(SPDT) relays. In addition model HLM6 has a fault
output.
RELAY SET POINTS FOR
GAS DETECTION MONITORS
Gas Detection Monitors are equipped with two relays—
low level and high level. Shipped from the factory, the
relays are set for 20% and 60% of the output of the
sensor. In other words, a 250 PPM sensor will activate
the low level alarm at 50 PPM and the high level alarm
at 150 PPM. The relay settings can be field adjusted.
Refer to page 13 for details.
SETTING ALARM OUTPUT FOR HLM6
MONITOR
Use a voltmeter to monitor the voltage on the calibration
pins. The voltage range is from 0.4V DC to 2.0V DC. The
voltage range corresponds to the 4-20mA range. (ie.
0.4V DC equals 4mA, 2.0V DC equals 20mA).
For the low level alarm relay setting, measure the voltage
across VLOW and GND. Set the desired low
level alarm relay using VLOW Pot. This setting applies
to the six channels.
For the high level alarm relay setting, measure the voltage
across VHIGH and GND. Set the desired high level alarm
relay using VHIGH Pot which is located furthest from the
calibration pins. This setting applies to the six channels.
SETTING ALARM OUTPUT FOR HLM2
MONITOR
Use a voltmeter to monitor the voltage on the calibration
pins. The voltage range is from 0.4 V DC to 2.0V DC. The
voltage range corresponds to the 4-20mA range. (i.e.
0.4V DC equals 4mA, 2.0V DC equals 20mA).
For the low level alarm relay setting, measure the
voltage across VLOW and GND. Set the desired low
level alarm relay using VLOW Pot. This setting applies
to both channels.
For the high level alarm relay setting, measure the
voltage across VHIGH and GND. Set the desired high
level alarm relay using VHIGH Pot. This setting applies
to both channels.
OUTPUT DELAYS
There is a fixed delay between the sensor output
indicating an alarm and the controller registering
this alarm condition as valid. This is to prevent false
alarms on transient outputs. This delay period is fixed
and is approximately 25 seconds for the low level and
another 25 seconds for the high level.
FAIL SAFE OPERATION
The fail safe jumper on all units is used to enable/
disable the high-level alarm relay to operate in fail
safe mode.
TABLE 5
3. Change to “SETTING ALARM OUTPUT FOR”
4. Change to “VLOW and GND”
5. Change to “VLOW Pot”
6. Change to “VHIGH and GND”
7. Change to “VHIGH Pot”
8. Change to “SETTING ALARM OUTPUT FOR”
9. Change to “VLOW and GND”
10. Change to “VLOW Pot”
11. Change to “VHIGH and GND”
12. Change to “VHIGH Pot”
13. Change as below:
OUTPUT DELAYS
i
FAIL SAFE OPERATION
i
Page 14
1. Delete all wiring diagrams, insert Appendix B
Page 15
1. Delete all wiring diagrams, insert Appendix C
Page 16
1. Delete
2. Delete
3. 2mA
