Helmer Scientific Horizon HLF105, Operation Manual

360137-D/D

16

Horizon Series™ Models

2 

View 

maximum

 temperature recording.

a 

Press and hold the 

Up Arrow

 button for 1 second and listen for a single beep.

b 

The display will alternate between 

HI

 and a valid temperature value five (5) times followed by a 

single beep to indicate exit back to the temperature display.

3 

View recorded temperature timer.

NOTE

► 

The timer denotes the period of time that has elapsed. It does not display the time at 

which a minimum or maximum temperature occurred.

► 

The maximum period of time the timer can record is 99:59 (99 hours and 59 minutes).

a 

Press and hold either the 

Up

 or 

Down Arrow

 button for 1 second.

b 

While the display is flashing the 

HI

 or 

LO

 value, press and hold the 

SET

 button for 1 second.

c 

The display will alternate five (5) times between 

CLr

 and a value representing the number of 

hours and minutes that have elapsed since the last recording (example: 12:47 would represent 12 
hours and 47 minutes).  A single beep will follow to indicate exit back to temperature display.

4 

Clear minimum and maximum temperature recordings.

a 

Press and hold either the 

Up

 or 

Down Arrow

 button for 1 second.

b 

While the display is flashing the 

HI

 or 

LO

 value, press and hold the 

SET

 button for 1 second and 

listen for a single beep.

c 

While the display is flashing the elapsed time since last reset, press and hold the 

SET

 button 

for 2 seconds. 

CLr

 will be displayed followed by a series of 3 beeps to indicate exit back to the 

temperature display.

NOTE

The minimum and maximum temperature and timer will reset when:

► 

the unit is powered off and battery backup is not engaged, or

► 

after 99 hours and 59 minutes have elapsed.

9.4 

Change Freezer Temperature Setpoint

NOTE 

Default setpoint is -30.0 °C

1 

Press and release 

SEL

 to change to Control mode.  The CONTROL lamp will illuminate.

2 

Press and hold 

SET

 to display the current setpoint temperature.

3 

Hold 

SET

 and press the 

Up 

or 

Down Arrow

 as necessary to set the desired setpoint value.

4 

Release all buttons; the setpoint is changed.

5 

Press and release 

SEL

 to return to Monitor mode.  The MONITOR lamp will illuminate.

9.5 

Table of Parameters

Parameter

Visual Indicator

Range

Default

Celsius or Fahrenheit

None

.C, .F

.C

High Temperature

MONITOR Lamp &  

HIGH Lamp

-40.0 to 40.0 (°C) 

-40 to 104 (°F)

-20.0°C

Low Temperature

MONITOR Lamp &  

LOW Lamp

-40.0 to 40.0 (°C) 

-40 to 104 (°F)

-40.0°C

Monitor Offset

MONITOR Lamp

-10.0 to 10.0 (°C) 

-18 to 18 (°F)

Varies

Control Offset

CONTROL Lamp

-10.0 to 10.0 (°C) 

-18 to 18 (°F)

Varies

Hysteresis

CONTROL Lamp

0.5 to 2.5 (°C) 

1 to 5 (°F)

2.0°C