Hampshire Controls Corporation
20 Mar. 2021
MPS Operating Manual
Page 6
Probe Location
Install the sensor probe in a location where it will respond to the average temperature of the
space being monitored and not to local conditions caused by door openings, ventilation fans, etc.
The object of the probe location is to provide some safety for the area being monitored without
generating “false” or nuisance alarms. For example, locating the sensor probe on the bottom of a
chest freezer will result in the alarm being sounded later than if it was located near the top.
However, locating the sensor too close to the top of the chest freezer could result in the alarm
being sounded due to routine lid opening. Choose a probe location that offers the safety desired
for the enclosure contents.
Power
Power-up
During power-up, the MPS will show a
“splash” screen with the firmware revision.
If the splash screen flashes continuously, or the
display shows
NO BATTERY
the internal
lithium-polymer (LiPo) battery may be
disconnected or require replacement.
When a battery is properly installed, a status
icon will show in the bottom right corner of the
display (see Current Readings).
BATTERY ICON
STATUS
Up Arrow
Charging
Solid block
Fully charged
Flashing block or
block with blank lines
Battery problem
Power-down
The MPS contains a lithium polymer (LiPo) battery connected through an auto-latching
disconnect circuit. During shipping, this circuit prevents the battery from supplying power to the
MPS. When you plug in the MPS power supply for the first the time, the circuit will activate,
preventing the device from turning off when power is disconnected.
In order to completely power-down the MPS you must follow this procedure:
Press-and-hold the TEST/RESET button until the MPS is in the reset state (backlight and
all LEDs are off)
With the TEST/RESET button held, unplug the power supply
Continue to hold the TEST/RESET button for 5 seconds
Release the TEST/RESET button
