Helmer Scientific i.Series
®
and Horizon Series
™
Refrigerator - Upright
Operation Manual
360372/B
20
Control Sensor Offset and Hysteresis
The control sensor affects the reading of the control probe temperature and therefore the actual temperature of the
refrigerator. This should not be adjusted from the original setting unless directed by Helmer Technical Service.
Hysteresis helps control the refrigeration based on the control probe temperature reading and the set point and should not
be changed from the default setting.
NOTICE
Control Sensor Offset and Hysteresis are factory-preset and should not be changed. Contact Helmer Technical Service for
instructions regarding changing these values.
6.7 Set Alarm Setpoints (Parameters)
1. Press and hold the
Up
and
Down Arrows
simultaneously for 3 seconds to enter program mode.
2.
The LED Display will show ˚C or ˚F to indicate Celsius or Fahrenheit.
3. Press
SEL
until HIGH TEMP or LOW TEMP and MONITOR lamps flash.
4. Hold
SET
, then press
Up
or
Down Arrow
to change the setpoint.
5. Release
SET
button. The new setting is saved.
6. Press and hold
Up
and
Down Arrows
simultaneously for 3 seconds to exit program mode.
6.8 Active Alarms
The controller displays temperature and alarm information.
Table 4. Horizon Series Active Alarms
Alarm
Visual Indicator
Description
High Temperature
HIGH TEMP lamp flashes
Chamber temperature reading is above high
temperature alarm setpoint
Low Temperature
LOW TEMP lamp flashes
Chamber temperature reading is below low
temperature alarm setpoint
Power Failure
”PoFF” appears on display
Power to unit has been disrupted
Probe Failure
“Prob” appears on display
Probe not functioning properly
Door Open < 3 min.
DOOR ALARM lamp lights
Door is open (less than three minutes)
Door Open > 3 min.
DOOR ALARM lamp flashes
Door has been open 3 minutes or longer*
*Audible alarm will sound after door is open for 3 minutes.
6.9 Mute and Disable Audible Alarms
Note
Muting audible alarms does not disable alarm lamps or signals sent through the remote alarm interface.
♦
Press
Down Arrow
(Mute) to mute audible alarms.
♦
To disable all audible alarms, insert the key in the Alarm Disable switch and turn.
6.10 Light Operation
The light switch is located on the monitoring and control panel and controls the LED light within the chamber.
Horizon Series Operation
