Dickson MM120 User Manual

1
Quick Start
back of the unit.
Unit is now on.
Place the thermistor probe(s) with glycol bottle in
the monitoring location
Mount the indicator using the included Velcro.
Indicator can also be wall mounted via Keyhole in
back of unit.
Allow glycol bottle(s) to normalize before turning
on alarm. (Wait approximately 1 hour)
3.
4.
5.
6.
Your Instrument Includes:
a. MM120 Temperature Indicator with Alarm,
1 Thermistor Probe Sealed in a Glycol Bottle,
2 AA Batteries, 3 Sets Velcro and Certificate of
Calibration
b. MM125 2 Channel Temperature Indicator with
Alarm, 2 Thermistor Probes sealed in
Glycol Bottles, 2 AA Batteries, 4 Sets of Velcro
and Certificate of Calibration.
Insert batteries into battery compartment on the
1.
2.
DICKSON MM120/125
Alarm Thermometer
Your MM120-125 default settings:
All dip switches in down position
Alarm: Off
1.
2.
Change Defaults
b. Display will change reading and display new
unit of measure.
Display Update:
a. Slide toggle switch on the back of the unit to
either Fast (up) or Standard (down).
b. Standard = 5 Minute Sample Rate; Fast = 1
Minute Sample Rate.
3.
Alarm:
a. Slide toggle switch on the back of the unit to
either Alarm On (up) or Alarm Off (down).
b. When the alarm is turned on the alarm symbol
will appear on the display.
Unit of Measure:
a. Slide the toggle switch on the back of the unit
to either deg. F (down) or deg. C (up)
1.
2.
Min/Max
b. The Min/Max readings will display the current
temperature until next reading is taken.
Powering off the unit resets stored min/max
values.
3.
Min/Max readings are always displayed.
To reset Min/Max readings:
a. Hold down the Clear button (on the front of
the unit) until CLR shows on the display. CLR
will display while clearing min/max.
1.
2.
Setting Alarm High/Low
b. CH1 and LOW will flash on the display.
c. Using the UP and DOWN buttons on the back
of the unit, set the target low temperature for
channel 1.
d. Once the target temperature has been set,
Press and release the Alarm Set button again to
set CH1 / HIGH.
e. Repeat steps a – d above to toggle through
CH1/LOW, CH1/HIGH, CH2/LOW, CH2/HIGH
(CH2 MM125 only).
Note: If no buttons have been pressed after 15 seconds,
the unit will exit Alarm Set mode and will save all new
settings.
The most common alarm settings have been preset
for each channel:
a. MM120
i. Channel 1: +34 (low) & +47°F (high)
(refrigerator)
b. MM125
i. Channel 1 (top probe): -20 (low) & +6°F
(high) (freezer)
ii. Channel 2 (bottom probe): +34 (low) &
+47°F (high) (refrigerator)
To change the presets:
a. Press and release the Alarm set button on the
back of the unit.
1.
2.
Unit of Measure: Deg. F
Sample Rate: Standard
3.
4.

Dickson MM120 Specifications

General

Type	Digital Thermometer
Display	LCD
Channels	1
Enclosure	Plastic
Power Source	Battery
Resolution	0.1°C (0.1°F)
Ambient Operating RH Conditions	0% to 95% RH (non-condensing)
Battery Life	Approximately 1 year
Calibration Options	Factory Calibrated
Sensor Type	Thermistor
Unit of Measure	°C or °F (selectable)

Summary

Quick Start Guide

Instrument Contents

Details the components included with the MM120/MM125 Temperature Indicator, such as probes, batteries, and calibration certificates.

Battery Installation

Instructions on how to insert the AA batteries into the battery compartment located on the back of the unit.

Probe and Unit Placement

Guides on placing the thermistor probe(s) and mounting the indicator unit in the desired monitoring location.

Glycol Normalization

Advises allowing the glycol bottle(s) to normalize for approximately 1 hour before turning on the alarm.

Changing Default Settings

Alarm Setting

How to enable or disable the alarm using a toggle switch and observe the alarm symbol on the display.

Unit of Measure Selection

Instructions to switch between Fahrenheit (down) and Celsius (up) using a back toggle switch.

Display Update Rate

Procedure to set the display update rate to Fast (1-minute sample) or Standard (5-minute sample).

Min/Max Readings

Resetting Min/Max Values

How to reset the displayed Min/Max readings by holding the Clear button until 'CLR' is shown.

Setting Alarm High/Low Thresholds

Preset Alarm Settings

Details the common preset high and low alarm limits for MM120 (refrigerator) and MM125 (freezer/refrigerator).

Customizing Alarm Presets

Step-by-step guide to change low and high alarm thresholds for each channel using the unit's buttons.

Clearing Alarm Conditions

Alarm Mode Behavior

Describes audio and visual indicators when the unit enters alarm mode, including flashing and beeping.

Clearing an Active Alarm

Procedure to temporarily silence the audible alarm and permanently stop flashing by using the Clear button.

Alarm Notification Settings

Explains display flashing for temperature deviations when the alarm is on, and how to reset it after exiting the range.