Benetech GM550, GM320 Instruction Manual

Infrared thermometer

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Instruction manual

A. Introduction

This infrared thermometer is used for
measuring the temperature of the object's
surface, which is applicable for various hot,
hazardous or hard to reach objects without
contact safely and quickly.

2) Thermal shock caused by high temperature
changes allow 30 minutes for unit to
stabilize before use.

3) Do not leave the unit on or near objects of

high temperature

MODEL: GM550

This unit consist of Optics, Temperature
Sensor Signal amplifier, Processing circuit and
LCD Display. The Optics collected the infrared
energy emitted by object and focus onto the
Sensor. Then the sensor translates the energy
into an electricity signal. This signal will be
turned out to be digital shown on the LCD after

the signal amplifier and processing circuit.

B. Warning & Cautions

1. Warning:

To avoid the potential situation may cause harm
or damage to people, please pay attention to
the following items:

1) Before you use this unit, check on the
plastic housing carefully. If there is any
damage, do not use it

2) Do not point laser directly at eye or
indirectly off reflective surfaces.

3) Do not use this unit in the environment of
explosive gas, steam or dusty.

2. Caution:

To avoid the damage of the unit or the target,
please protect from the following situations:

C. Distance to Spot size

1) When take measurement, pay attention to
the D stance to Spot Size. As the Distance (D)
from the target surface increases, the spot
size (S) of the area measured by the unit
becomes larger. The Distance to Spot size of
the unit is 12:1

***This unit is equipped with a laser, which is
used for aiming.

2) Field of view: Make sure the target is larger

than the unit's spot size. The smaller the
target the closer measure distance. When
accuracy is critical, make sure the ta get is at
least twice as large as the spot size.

1) EMF (electro-magnetic fields) from arc
welders, or induction heaters.

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D. Emissivity

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F. LCD display & Buttons

G. Maintenance

Most organic materials and painted or oxidized
surfaces have an emissivity of 0.95 (pre-set in
the unit). Inaccurate readings will result from
measuring shiny or polished metal surfaces. To
compensate, cover the target surface with
masking tape or flat black paint. Measure the
tape or painted surface when the tape or
painted reach the same temperature as the

material underneath.

E. Operation

Operating the unit：

1) Open the battery door
and insert a battery
properly.

2) Pull the trigger to turn
on the unit.

3) Aim at the target surface and pull the
trigger, then temperature will be shown on
the LCD. This unit is equipped with a laser,

which is only used for aiming.

Locating a Hot Spot：
To find a hot spot, aim the thermometer outside
of interest, then scan across with an up and
down motion until you locate the hot spot.

(Figure 3)

1. LCD display: Figure 4
a) Data hold icon

b) Scanning icon
c) Laser on icon
d) Backlight on icon
e) Battery power icon
f) Temperature unit

g) Temperature reading

2. Buttons: Figure 5

1) Trigger: When pull the trigger, LCD
display reading with SCAN icon. Release
the trigger, display reading with HOLD
icon for 7 sec (approx). Built-in 20 sec
auto power off function.

2) Laser on/off button

3) Celsius / Fahrenheit switch button

4) Back light on/off button When backlight is
on, any operations will activate the

backlight for 7 seconds.

1. Lens Cleaning: Blow off loose particles
using clean compressed air . Gently brush
remaining debris away with a moist cotton
swab. The swab may be moistened with
water.

2. Case cleaning: Clean the case with a
damp sponge/ cloth and mild soap.

Note:

1) 1) Do not use solvent to clean plastic lens.

2) 2) Do not submerge the unit in water.

H. Specification

Temperature range

Accuracy

Resolution
Repeatability
Response time 500 mSec, 95% response
Spectral response 8-14 um
Emissivity 0.95 Preset (Fixed)
Distance to Spot size 12:1
Operating Temperature

Operating Humidity

Storage Temperature
Power 9V *1 Battery
Typical battery life

(Alkaline)
Weight 147.5g
Dimension 153x101x43mm

-50 ~ 550 C (-58 ~ 1022 F)
0~550C (32 ~1022F)

±1.5C(±2.7F ) or ±1.5%

-50~0C (-26~32F) ±3C( ±5F)
Whichever is greater

0.1Cor 0.1F
1% of reading or 1C

0~ 40C (32 ~ 104F)
10~95%RH non-condensing up to

30C(86F)

-20 ~ 60C (-4 ~ 140F)

Non-laser mode: 22 hrs;
Laser Models:12 hrs

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