Hampshire Controls Corporation
20 Mar. 2021
MPS Operating Manual
Page 14
Alarms
Power Loss
When the MPS loses line-power it will continue to operate on the internal LiPo battery.
However, the following changes in operation will occur:
Display and backlight will turn off to save power (press any button to enable)
Display will show
PowerFail
down the right edge (when display is enabled)
Status LEDs will turn off (press any button to enable)
Alarm LED will flash until power is restored
Alarm beeper will sound (press any button to mute)
Relay will change to alarm state
o
If equipped with multiple relays, this will be the channel 1 relay
No action is required when power is restored; the MPS will resume normal function.
Sensor Limits
If the probe readings are within the alarm limits (less than the high limit and greater than the low
limit), the STATUS LED will blink green.
When the temperature reading meets or exceed the temperature limits the STATUS LED will
blink red.
After the probe’s alarm delay time is exceeded the unit will blink the ALARM LED and beep the
buzzer.
The user can MUTE the buzzer by tapping the MUTE/MENU button. The unit will reduce the
audible signal from a loud beep, to a quieter and less frequent chirp. It will remain muted until
the
Mute
time expires or a different probe goes into alarm.
Once the Alarm state has been signaled the unit will wait the
RelayDelay
time before
tripping the appropriate relay. Units with individual channel relays, have individual
RelayDelay
times. Units with a single relay have one
RelayDelay
time that applies to
any alarm condition.
Door Switch Alarm
For units equipped with the optional door switch input, the door alarm condition will preempt the
normal sensor reading display with the door switch input status display (
Door Input
). This
display will show the door status (
Open
or
Closed
) and the alarm state (
OK
,
Delay
, or
Alarm
).
