Major tech MT980 User manual

Instruction Manual
MT980
Refrigerant (Halogen) Leak Detector

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Introduction
The Refrigerant Leak Detector detects all CFC refrigerants
such as R-22, R-124, R-11 and R-12. The ultra-sensitive
long-life sensor detects the more current, difficult to detect
HFC refrigerants such as R-134a, R-404A, and new R-22
replacements, R-410A and R-407C. The Refrigerant Leak
Detector’s long, slim gooseneck probe design is easy to use
in close areas and for extending into hard-to-reach areas. It
is adjustable alarm, easy one-hand operation and impact
resistance storage case add up to value and convenience
Applications and Features include
Easily operate the Refrigerant Leak Detector with one hand
to detect presence of Refrigerants. Audible and visual
indicators help pinpoint leak source. Adjustable “tic” rate
helps eliminate background gas concentration in
contaminated environments.
•high sensitivity to detect.100ppm of R- 134a /R- 22
•Adjustable tick rate to locate leaks quickly and easily
•Visual leak detection by LED indicators
•Precision sensor detects even the smallest leaks
•Includes earphone Jack
•16” gooseneck
International Symbols
Important Information; see manual
Conforms to European Union directives

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Controls and Indicators
1. Sensor Tip Guard & Sensor (internal)
2. Gooseneck Probe
3. Alarm Light
4. Ready Light (Power-On)
5. Power ON/OFF Slide Switch
6. Earphone Jack
7. Tic Rate (Sensitivity) Adjustment
8. Probe Clip
9. Hand handle
10. Batteries cover
Instructions
Switch on the Refrigerant Leak detector by sliding the
ON/OFF button and the READY light is glowing. The
Refrigerant Leak Detector runs through a one-minute
warm-up and self-zeroing sequence when it is first turned
on in fresh air. The alarm of the instrument maybe very
loud without detecting any gas. That is caused by the high
Tic Rate preset in rotary wheel.
Rate (Sensitivity) Adjustment
Each time the instrument is put into service, you should
conduct a quick functional test. Adjust the Tic Rate to
non-alarm level. Then, simply expose the sensor to a
known leak, like a cigarette lighter, or pass the probe over
a drop of combustible fluid. After the initial warm-up, the

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instrument can be used to detect Refrigerant. When the
sensor in the probe tip detects a Refrigerant, the tic rate
will increase, and the instrument sounds a warbling tone
while the ALARM light is lit. As the concentration of gas
increases so does the tic rate.
If the situation calls for quiet operation, or if background
noise makes it difficult to hear the built-in speaker, you can
use an earphone. The jack is at the top of the instrument.
Note that listening to the alarm or tic through the
earphone is very loud.
If the READY light is off, the batteries are low. They should
be replaced immediately. Low batteries will adversely
affect the instrument’s reliability. See the replacement
procedures.
Adjusting the Tic Rate (Sensitivity)
The tic rate tells you when the sensor (in the tip of the
instrument) is getting close to Leak Refrigerant. You can
control the tic rate using the rotary wheel in the center of
the instrument.
•Move the wheel clockwise to increase the frequency
•Move the wheel counterclockwise to decrease the
frequency
As the sensor comes near a Refrigerant source, the tic rate
increases. In order to isolate the source of a leak, you may

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need to move the wheel counter anti-clockwise,
decreasing the sensitivity, as the sensor moves closer.
Replacing the Batteries
Replace your 1.5 volt /size R14C alkaline batteries when:
•The green READY light off
•No light or other activity occurs upon turning the
instrument on
To replace the batteries:
1. Lay the instrument face-down on a back face.
2. Remove the battery cover. Apply upward pressure to
the tab at the bottom of the battery cover while
lifting it out.
3. Remove the batteries using a coin or screwdriver, if
necessary, to pry them out.
4. Replace all three batteries with new ones.
Replacing the Sensor
Although the sensor is designed to offer many years of
reliable service, it may become inoperable if it is
submerged in liquid or otherwise physically damaged.
To replace sensor:
1. Turn the instrument off
2. Remove the upper tip guard by pressing straight up
from the alignment notch that separates the two
halves of the tip guard.
3. This is a sturdy component, but use caution bending
its leads.

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4. Pull the sensor straight up from its tip housing.
5. Replace the sensor, pressing it straight in. Reassemble
in reverse order.
Specifications
Sensitivity to detect
100ppm of R- 134a/ R- 22
Sensor Type
Low power semiconductor
Warm Up Time
Approx.1 minute
Response Time
Less than 2 seconds (up to 40%
LEL)
Alarm
Visible & Audible at 10% LEL for all
chlorofluorocarbons (CFC)
Power Supply
3”C” cell batteries
Battery Life
8 hours continuous use, typical
Duty Cycle
Continuous
Probe Length
400mm
Dimensions
221x72x46mm
Weight
498g
Operating Conditions
To ensure accurate readings use it only when ambient air is
within this range:
Temperature: 0 to 50°C
Humidity: 10 to 90% RH (noncondensing)

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Partial list of refrigerants
R-12 ALTERNATIVES
R-22 ALTERNATIVES
R-134a, R-401a (MP-39),
R-401B (MP-66),
R-401C (MP-52), R-406A
(GHG)
R-407C, R-401A, R-410B,
R-507
R-414A (GHG-X4), R-414B
(hot Shot).
R-416A (Frig C, FR-12)
R-113, R-13B& R-503
ALTERNATIVES
R-409A (FX-56), Freeze 12,
Free Zone,
GHG-X5, GHG-HP, IKON 12
R-403B, R-508A, R-508B
R-502, R-500 ALTERNATIVES
HC REFRIGERANTS
(not SNAP approved)
R-402A, R-402B, R-404A,
R-407A, R-408A,
R-411A, R-411B, R-507
R-290, R-600A,
R-170/R-290, R-600A/R-290
∗SNAP is the EPA’s Significant New Alternatives Program
for ozone
∗Depleting refrigerants for mobile and stationary A/C
systems

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