CHEMICAL SENSING DEVICE
ASSEMBLY NUMBERS
918068-1
918068-2
701 S. RIDGE AVENUE
TROY, OHIO 45374-0001
937 332-3000
www.hobartcorp.com
FORM 35385 Rev. A (Jan. 2005)
TABLE OF CONTENTS
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Mount Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Connect Chemicals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Start-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
To Recalibrate Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
© HOBART, 2004
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Installation, Operation, Use & Care Of
CHEMICAL SENSING DEVICE
ASSEMBLY NUMBERS 918068-1, 918068-2
SAVE THESE INSTRUCTIONS
GENERAL
This device senses the presence of liquid chemical in a tube as it passes through a sensor.
INSTALLATION
MOUNT BOX
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE DEVICE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
Mount box in a convenient location near chemical pumps. Use screws for mounting to a
convenient wall. Mount box so tubes run vertically from top to bottom.
CONNECT CHEMICALS
Connect chemical lines to NSF approved,
be either top to bottom or bottom to top (Fig. 1). Do not remove
device. Reducing unions are provided for splicing
1
/4" diameter, fittings and tubing. Direction of flow can
1
/8" tubing to 1/4" tubing.
1
/4" tubing from chemical sensing
4.688"
(11.91 cm)
HOLD TO
ENABLE / DISABLE
DETERGENT
RINSE AID
FLASHING – NO CHEMICAL
ON - CHEMICAL
OFF – DISABLED
Use left tube for
Detergent.
Use middle tube
for Rinse Aid.
Use right tube
for Sanitizer.
SANITIZER
Depth:
LED's
8.750"
(22.23 cm)
Fig. 1
2.375"
(6.03 cm)
ELECTRICAL CONNECTION
WARNING: ELECTRICAL AND GROUNDING CONNECTIONS MUST COMPLY WITH THE
APPLICABLE PORTIONS OF THE NATIONAL ELECTRICAL CODE AND/OR OTHER LOCAL
ELECTRICAL CODES.
WARNING: THE SUPPLY CORD ON THIS DEVICE IS PROVIDED WITH A GROUNDING PLUG.
THE OUTLET TO WHICH THIS PLUG IS CONNECTED MUST BE PROPERLY GROUNDED. IF
THE RECEPTACLE IS NOT THE PROPER GROUNDING TYPE, CONTACT AN ELECTRICIAN.
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OPERATION
START-UP
Operate the chemical dispensing pumps (refer to machine operating manual) to make sure that
liquid chemical is present in the tubing going through the sensors in the device. Once the 120 volt
electrical cord of the device is plugged in, LED indicator lights come on continuously to indicate
that liquid chemical is present in the tube(s).
A flashing indicator light and a periodic audible alarm indicate that liquid chemical has been
depleted and needs to be replenished.
If one or more chemicals are not going to be used, the system can be set so that the related sensor
is disabled. To disable the sensor, press the appropriate button until the light goes off. To
reactivate a disabled sensor, make sure liquid chemical is present in the tubing and press the
appropriate button again until the light turns on. If sensor is enabled while tube is empty, device
may not operate properly.
Keep sufficient chemical supplies on hand to replenish as necessary.
CLEANING
When necessary, carefully wipe the device with a damp cloth.
MAINTENANCE
TO RECALIBRATE SENSORS
Make sure liquid chemical is present in the sensing tube. Press the appropriate button until the
light turns off. Press the button again until the light comes on. The indicator light should come
on continuously to indicate presence of liquid chemical in the tubing. If chemical is present and
LED's are flashing, adjustment to the sensor potentiometers may be necessary. Remove the
plugs from the bottom of the box using a screwdriver. Adjust the potentiometer using a small, flat
screwdriver. Slowly turn the potentiometer screw clockwise until the LED stays on continouously.
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE
Improper indication: Make sure device power cord is plugged in. Replenish
chemical supplies.
Flashing when chemical is present. Recalibrate sensor(s).
LED lit continuously, tubing is empty. Verify liquid chemical is present in tube and recalibrate
sensor(s).
If the device cannot be manually Contact Hobart Service.
recalibrated or if recalibration does
not fix the problem:
FORM 35385 Rev. A (Jan. 2005) PRINTED IN U. S. A.
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