Microtemp Electronics ST-1B Manuale utente
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 o: 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.
No. 1: Positive power switch for circuit board.
No. 2: This switch enables a relay to activate a secondary alarm system
or phone dialer. This is accessed by using the terminal board provided on
the circuit board.
No. 3: Sets time delay. UP is 10 second delay, DOWN is 55 minute delay.
See instructions.
No. 4: Is negative power switch for circuit board.
NOTE: After an alarm condition , this unit will automatically reset
when the temperature has been normal for two minutes.
4. After all DIP switches have been selected, set the alarm. Alarm can be set from face plate or on back of display module.
F/C must be selected FIRST before setting alarm parameters. NOTE: There is an unmarked switch under the right side of
the LOGO on the face plate that must be pushed when selecting LOW or HIGH alarm settings. Alarm settings can be set using the
buttons on the back of display module. Unmarked switch helps prevent unauthorized tampering.
SET HIGH ALARM: On the faceplate, press and hold the HIGH button and the logo button together. Display will show the setting for
HIGH. After one second, numbers will advance rapidly. When display reaches desired set point, release buttons. After releasing both
buttons, display will return to temperature reading after two seconds. HIGH will appear at left of display.
Alarm MUST be mounted in a well lit area, illuminated most of the day. This unit requires light to operate or the batteries will not last.
Alarm should be mounted in an area that can be seen or heard at all times.
HIGH alarm setting MUST be set no closer than 5°
higher than normal operating temperatures. Exam-
ple: Cooler operates at 35°, set alarm to 40°. Freezer
operates at -10°, set alarm to 0°. Any closer settings
will make the alarm a nuisance and the batteries will
expire quickly. LOW alarm setting should be 5° lower
than normal operating temperature. If above conditions
are met, normal battery life is 2 years or more.
Display
Set High Alarm
Logo Pad
Silence Alarm
Set Low Alarm
Alarm Warning Light
Mounting Tab
Standard
10’ Sensor
NOTE: When the F/C switch is pushed, all alarm set-
tings are erased. HIGH and LOW alarm points MUST be
reset after changing temperature scale or batteries.
Microtemp Model No. ST-1C
ON ON ON ON
1234
Board
Power
Board
Power
RelayDelay
OFF OFF OFF OFF
On
O
None
Model ST-1C
ON ON ON ON
MODULE
POWER
OFF OFF OFF OFF
NOT
USED
ON ON
OFF OFF
DISABLED
ACTIVE
POWER TIME
DELAY RELAY
ONE HOUR
NONE
NOT
USED
Model ST-1B
1 2 3 4 5 6
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