FAILSAFE-OPEN AND CLOSED MODES

STANDARD DIGITAL READOUT

EXTERNAL POWER: NOT REQUIRED

EXPLOSION PROOF

TIMED SHUTDOWN PROTECTION

PROGRAMMABLE ALARM TIME

DC POWERED

The DLM-920 operates with two (2) "AA" regular or alkaline batteries which are easily replaceable. The low-cost batteries have a life expectancy of between 5 and 10 years depending on the cycle time of the divider block. The DLM-920 comes equipped with a "Low Battery Function". The Cycle Indicator light is the “Low Battery” light. After thirty (30) days of flashing the low battery warning, the DLM- 920 will go into alarm state and cannot be reset until batteries have been replaced.

SPECIFICATIONS

Material........................................................................Aluminum
Temperature Range. .................................................-40 F to +170F
Alarm/Shutdown.........................................Programmable - 20 sec to 4 min 30 sec Alarm
Power...........................................................................2 “AA” 1.5V Batteries
Switch Rating............................................................ 2.5VA/120VAC/240 VDC
Warranty.....................................................................2 Years
Display/Strokes.........................................................0-99999

ENCLOSURE RATINGS

FM Approved Instr Housing:

CLASS I, GROUPS B, C, D
CLASS II GROUPS E, F, G
CLASIII TYPE 4X

DESCRIPTION

The DLM-920 is a digital microprocessor control device specifically designed to protect gas compressors from damage due to loss of lubrication . Lubrication to the compressor flows through a divider block lubrication system forcing an internal piston to cycle back and forth. With the Proximity Switch, ordered separately, mounted to one of the divider blocks, this back and forth movement results in an ON/OFF state which the DLM-920 continuously analyzes. If no movement is detected, the DLM-920 will activate the alarm delay which is easily adjustable from 20 sec's. to 4 mins. 30 sec's. When the alarm delay expires, "shutdown" of the compressor will occur preventing any damage.

OPERATION

The DLM-920 alarm time can be viewed by pressing and holding the "Reset" button which will reset the "Cycle Indicator" to zero and flash the alarm time at one second intervals. To view changing the alarm time, simply hold the "Reset" button down and turn the potentiometer. Adjustment of the alarm time is possible without holding the "Reset" button down so that the counter does not reset to zero. The alarm time is not affected by temperature change. The DLM- 920 is a bipolar device. It is not necessary to determine the polarity of the wires coming from the annunciator, PLC, or other types of shutdown controllers because the closed loop and open loop alarm circuits are bipolar.

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