Liquid Nitrogen Level Monitorʼs Alarm Contact Specifications; Connection To Remote Alarms - Thermo Scientific Locator Series Operation Manual And Parts List

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Liquid Nitrogen Level Monitorʼs
Alarm Contact Specifications
The Liquid Nitrogen Level Monitorʼs alarm contact is a
Photomos type relay.
Contact Form: Type 1 form A (AC/DC)
Load Voltage Maximum: 400 Volts (peak)
Load Current Maximum: 120 mA (continuous)
Peak Load Current: 300 mA
Typical On Resistance: Maximum 50 Ω

Connection to Remote Alarms

1. Disconnect the Liquid Nitrogen Level Monitor
from the power supply. Disconnect power to your
alarm system.
2. Remove the three screws securing the Liquid
Nitrogen Level Monitorʼs cover. Pull the cover up
and out of the way. (See Figure 1.)
3. Remove the black plug from the side of the
cover. Insert the wires for the remote alarm
through this hole.
4. Connect the remote alarm wires as shown in
Figures 1, 2 and 3.
5. Set the jumpers J4 and J6 according to the type
of operating mode necessary. For a normally
open mode of operation, place the jumper on J6.
For a normally closed mode of operation, place
the jumper on J4. (See Figure 2).
6. Place the cover back into position and secure
with the three screws removed in Step 2 above.
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