INFICON
743-202-xxx LDM150 Operating Manual 200305
8/44
E
ng
lis
h
E
ng
lis
h
3.
Cautions and Warnings
WARNING
The unit must only be opened by authorized personnel!
No matter if power supply is removed the unit can still have external high voltage
over the volt free contacts.
4.
Alarm Levels, Factory Settings
Ammonia (NH
3
) 0-4000 ppm
C=150 ppm
B=500 ppm
A=3000 ppm
HFC, HFO, HCFC 0-4000 ppm
C=100 ppm
B=1000 ppm
A=2000 ppm
Carbon Dioxide (CO
2
) 0-10000 ppm
C=2000 ppm
B=5000 ppm
A=8000 ppm
5.
Function
When power supply is switched on, a green LED will flash to indicate power ”ON”. This will also start
the heating process of the sensor. After approximately 4 minutes the green LED will light and indicate
”Sensor Active”.
The detector has one yellow and two red LEDs. The yellow LED indicates low gas concentration
(Alarm C) and the red LEDs indicate medium gas concentration (Alarm B) and high gas concentration
(Alarm A).
When gas is detected the LEDs (2 - Fig. 1) will light and the relay corresponding to the alarm level will
change state. If alarm delay is chosen (see below) the respective LED will flash, and it will light (and
the relay will change state) when the chosen delay time is exceeded.
1.1: n 1 - Delay
1.2: n 2 - Delay
1.3: n 3 - Alarm reset: ON=Auto, OFF=Manual
1.4: n 4 - Not used
2.1: LED A
2.2: LED B
2.3: LED C
2.4: Power
3.1: GV Offset
3.2: +5 VDC
3.3: (-)
3.4: ALARM C
3.5: ALARM B
3.6: ALARM A
3.7: Test terminal
4.1: A adjustment
4.2: B adjustment
4.3: C adjustment
5: Reset/Test/Service
