Helmer Scientific Horizon HLF105, Operation Manual

360137-D/D

17

Horizon Series™ Models

9.5.1 

Setting Parameter Values

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 and release 

SEL

 button to scroll through the parameters.

4 

Once the desired parameter is selected, press and hold the 

SET

 button while pressing the 

Up

 or 

Down Arrow

 to select the desired value.

5 

Release 

SET

 button.  The new setting is saved.

6 

Press and hold the 

Up

 and 

Down Arrows

 simultaneously for 3 seconds to exit program mode.

NOTE 

Contact Helmer Technical Service for setting Hysteresis values.

9.5.2 

Set Temperature Units

NOTE 

If temperature units are changed, the temperature setpoints, offsets and alarm settings 
must be recalibrated.

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 and hold the 

SET

 button while pressing the 

Up

 or 

Down Arrow

 to select the desired 

temperature unit.

4 Release 

SET

 button. The new setting is saved.

5 

Press and hold the 

Up

 and 

Down Arrows

 simultaneously for 3 seconds to exit program mode. 

9.6 

Temperature Calibration Offsets

Temperature calibration offsets indicate an acceptable margin of error between the actual temperature 

value and the desired temperature value.

9.6.1 

Monitor Offset

► 

Value is factory-set to match an independent thermometer.

► 

Refer to the service manual for instructions in changing the Monitor Offset.

9.6.2 

Control Sensor Offset

► 

Factory-set to match a calibrated reference thermometer.

► 

Varies for each freezer.

NOTICE

Control Sensor Offset is factory-preset and should not be changed.  Contact Helmer 

Technical Service for instructions regarding changing the Control Sensor Offset.

9.6.3 Hysteresis

► 

Allowable temperature variance on each side of the freezer setpoint.

NOTICE

Hysteresis is factory-preset and should not be changed.  Contact Helmer Technical 

Service for instructions regarding changing the Hysteresis value.