MONITORS MOVEMENT OF DIVIDER BLOCK PISTON FOR DEPENDABLE “TIMED” SHUTDOWN PROTECTION

CLOSED LOOP OR OPEN LOOP OPERATION

INSTALLS DIRECTLY TO DIVIDER VALVE

NOT AFFECTED BY TEMPERATURE OR OIL VISCOSITY

REQUIRES NO EXTERNAL POWER

LED INDICATOR - CYCLE INDICATION

DEDICATED SWITCH CLOSURE TO MONITOR EACH DIVIDER VALVE CYCLE (PS OPTION)

SPECIFICATIONS

Temperature Range.............................................. -40C to +55C
Switch RaTing........................................................2.5VA/240 VDC
PRX Rating............................................2.5VA/200 VDC MAX/0.5A
Epoxy Encapsulated.......................UL LISTED EL-CAST VFR 641
Alarm/Shutdown........................ Factory default for 3 minute alarm
Power......................................Field Replaceable - Lithium Battery
.......................................3.6 Volt, 1.5Ah, 75mA MAX Contentious Current
Battery........................................................................ P/N 000505
Divider Block Application............Dropsa/Lincoln/SBCO/Lubriquip
Warranty.........................................................................2.5 Years

DESCRIPTION

The DNFT-LED-PS is a totally enclosed electronic device, combining the latest technology in microprocessor and transistor components for detecting Slow-Flow and No-Flow of divider block lubrication systems. The DNFT incorporates an oscillating crystal to accurately monitor the cycle time of the lubrication system to enable precision timed shutdown capability. The magnet assembly and control housing mount directly to the divider valve to become an integral part of the lubrication system. The DNFT operates on a field replaceable lithium battery. If battery voltage drops below normal operating levels the DNFT goes into alarm mode and the unit cannot be restarted. LED models utilize an LED to indicate each cycle of the divider valve. This enables the operator to easily set and monitor lubrication rates. The DNFT has been designed and rated for use in Class I Zone I environments, to be used outdoors in wet or dry locations, in altitudes under 2000 meters, with a Pollution Degree of 4.

OPERATION

Lubricant flow through the divider valve assembly forces the pistons to cycle back and forth causing a lateral movement of a magnet linked to the piston. Movement is monitored by the microprocessor which resets the timer, lights the LED, and allows the unit to continue operation, this indicates one complete cycle of the lubrication system. The microprocessor must receive this cycle in a predetermined time or a shutdown will occur. The DNFT will automatically reset alarm circuit when normal operation of divider valve resumes.

P/N 000507 DNFT-LED-PS DIGITAL NO-FLOW TIMER WITH DEDICATED PROXIMITY SWITCH. INSTALL ON DROPSA/LINCOLN/SBCO/LUBRIQUIP DIVIDER BLOCK. SWITCH RATING 2.5VA 240VDC

1. Loosen all Allen head set screws (A) on DNFT-LED (B) and remove magnet housing (C). Do not remove magnet, spring, or spacer from magnet housing.
2. Remove piston enclosure plug (D) from end of divider valve where DNFT-LED will be installed. The DNFT-LED does not have to be installed on the top divider valve. It may be installed on any convenient divider valve, top to bottom. (Notice:Do not install DNFT-LED on Lincoln divider valves with cycle indicator pins or any Dropsa divider valve less than SMX 16.)
3. Be sure O-ring or metal gasket (F) is in place on magnet housing (C). Screw magnet housing (C) into end of divider valve (E). Torque to 15 foot pounds max.
4. Slide DNFT-LED (B) all the way onto hex of magnet housing (C). Tighten set screws on hex of magnet housing. Torque 25 inch pounds max.
5. The LCD (G) on the DNFT-LED indicates total divider valve cycles and changes with each cycle. This enables operator to adjust the lubricator pump for correct cycle time and oil consumption recommended by compressor manufacturer. If the number on the LCD (G) does not change with compressor running or by manually pumping oil into divider valve, the DNFT-LED must be adjusted.
6. Before adjusting DNFT-LED, divider valve must be cycling. This can be achieved with the compressor running or by manually pumping oil through the divider valve assembly with a hand priming pump.
7. Adjustment is made by sliding the DNFT-LED (B) all the way on the hex of the magnet housing (C). Tighten set screws on hex of the magnet housing to 25 inch pounds max. Check for LCD (G) change to confirm correct adjustment. If LCD (G) does not change with divider valve cycling, adjust the DNFT-LED back in 1/16" increments. Correct adjustment of the DNFT-LED is confirmed by number change on the LCD (G).
8. All conduit and connections should be appropriate for area classification. Notice: Conduit and fittings must be supported to avoid bending magnet housing.
9. After installing magnet assembly and pre-compressor start-up, it is absolutely necessary to purge all air from divider block lubrication system. This can easily be accomplished with a lubrication system purge gun.
10.DNFT-LED must be installed with correct magnet assembly for each divider valve manufacturer. Lincoln-7/16"-20 extended nose with O- ring Dropsa-1/4” BSP with special metal spacer Trabon-1994 or earlier 7/16"-20 with metal crush gasket Trabon-1995 and later 7/16"-20 with O-ring

DNFT BATTERY REPLACEMENT INSTRUCTIONS

Directions for replacing the battery in the Digital No Flow Timer

1. Shut down the engine or set the bypass timer.

2. Use a 3/8" ratchet to remove the 1/2" NPT Pipe plug.

3. Remove the battery from the DNFT and disconnect from the polarized connector.

4. Connect the new battery to the attached polarized plug.

5. Reinsert the battery and reinstall 1/2" NPT Pipe plug.

6. Verify the DNFT is working by pre-lubing the system and check for LCD number change.

ITEMS REQUIRED FOR REPLACING THE DNFT BATTERY:
(1) P/N: 000505 BATTERY or RADIO SHACK P/N: 960-0418 (alternate replacement)
(1) 3/8“ RATCHET WRENCH (for removal of battery plug)

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