Microtemp Electronics
-
Solar / Battery Digital Thermometer and Alarm
Model ST-1B and Model ST-1C
Phone Dialer Terminal Block
Normally open and normally closed dry contacts are
available for dialers or secondary alarm systems. The #2 DIP
switch
MUST
be in the up position for this option to operate.
HIGH Alarm
F/C Scale
ON / OFF
Switches
Jumper
LOW Alarm
Batteries
When low battery symbol appears in the display, batteries
MUST
be
replaced. Alkaline batteries are supplied with the unit. When used
outdoors, batteries must be NiMH to handle current from solar cells.
Jumper in this position will allow a 60 minute delay
when the #3 dip switch is in the “OFF” position.
Jumper in this position will allow a 110 minute delay
when the #3 dip switch is in the “OFF” position.
This unit is factory set for a 60 minute time delay. Time delay
can be changed to 110 minutes by changing the position of the
jumper as described above.
CALIBRATION: Unit is factory calibrated. Accuracy is
equal to + or - 1° Celsius
Alarm settings must be reset whenever batteries are replaced or F/C switch is pressed.
Troubleshooting Tips
• Constant -45°C or -55°F on Display:
Open circuit to sensor due to broken wires, unplugged sensor cable on circuit board, or
defective sensor. If repairs cannot be made, replace sensor assembly.
• - - - On display:
Shorted circuit to sensor may be due to a pinched or crimped cable, or defective sensor. Repair cable or replace
sensor assembly.
• Alarm does not go off:
Make sure alarm is activated. HIGH or LOW must be visible at left in display. Batteries may have dis-
lodged during shipment. Change batteries when battery icon appears on display. WEAK BATTERIES MUST BE REPLACED.
• Unit does not activate when DIP switch 1 is turned on:
Check batteries. Push ON/OFF button on back of display.
InSTallaTIon and opEraTIng InSTrUcTIonS
Note: All settings should be made before mounting alarm
1. Turn on unit by placing the #1 and #4 DIP switches (on back) in the UP position.
2. Sensor can exit alarm from the side or the back. To move sensor to the back exit: Remove four front screws / Unplug sensor
from circuit board / Carefully remove sensor and lock from side hole / Insert hole plug (provided) / Discard cord lock, then
plug sensor back into sensor through large hole on back and assemble case / Replace screws
3. Set DIP switches to fit your application. See DIP diagrams next page.
Microtemp Model No. ST-1C
WarranTY:
Good for one year from date of purchase. Covers labor and material only. This unit cannot cause a refrigeration failure and is
not liable for product loss. If unit becomes defective, contact manufacturer for replacement or repairs as soon as possible.
