Page 373 - Praxair - Specialty Gases and Equipment Reference Guide

Cryogenic Products

Liquid Nitrogen Handling

Liquid Nitrogen Low Level Alarms
Model 626
This unique controller has been designed to provide a com-
plete working alarm system. This alarm provides protection
during the time the probe is unplugged, or removed from the
dewar. When the probe is removed from the dewar during a
work function, simply press the work button. This will keep
the alarm in a momentary standby mode (approximately 10
minutes). If the probe is not returned after 10 minutes, the
alarm will slowly return to its full audible horn and activate
the remote relay.
The Progressive Audible Horn allows the operator to remove
the probe from the dewar without the unit going into an
audible and a remote relay alarm. Pressing the Work/Mute
button will lower the horn sound (which has been factory set). Model 626 LN²
After 10 minutes the horn will gradually increase to maximum Low Level Alarm,
volume. This will alert the operator to place the probe back Small Dewar Lid Size
into the dewar, or press the Work/Mute button again.

Features Ordering Information
n Low Level Alarm n Universal 9 volt AC Wall Part Number Description
n Work Mute Button Transformer (117 volt/ PRS 626 Liquid Nitrogen Low Level Alarm
option 220 volt)
n Progressive Audible Horn n Open Probe Alarm
n Press to Test Remote Relay
(5 seconds) n Shorted Probe Alarm
n Flashing Alarm LED (normal n Remote Alarm Output
no flashing)

Model 610
Model 610 is a battery operated liquid nitrogen (LN2) Low
Level Alarm, providing up to 5 days of alarm on one (1)
charge. This handy unit is also equipped with a built-in battery
Section E – Gas Handling Equipment
charger, a bracket designed to protect the unit during fill and
provide easy access to the front plate.
Model 610 battery
Features operated LN ² Low
n Built-in battery charger n Easy Installation Level Alarm
n Continuous alarm (5 days on n Compact size
full battery charge) (3-1/4" x 5-1/2" x 1-3/4")
n Universal 9 volt AC wall n Complete with mounting
transformer/option 220 volt bracket to fit on the unit
n Open or shorted probe handle
protection
n Push to Test button (battery
and alarm can both be tested
at the same time)

Ordering Information
Part Number Description
PRS 610 Battery Operated Liquid Nitrogen Low Level Alarm

E•372 1-877-PRAXAIR www.praxairdirect.com