Introduction
The DTH51 gives you quick access to the information you need when
installing or maintaining heating and cooling systems. Manufacturers
of some of the newer “high-efficiency” cooling systems require you to
charge them based on wet bulb and dry bulb specifications. The DTH51
offers you the fastest method to date of taking these measurements.
It combines the speed and convenience of an infrared thermometer
with the accuracy and reliability of a digital psychrometer and ambient
temperature meter in one product.
The DT H 51 is battery operated and measures Humidity, Dew Point, We t
Bulb, Air Te m p e rature (Dry Bulb), Surface Te m p e rature and the difference
b e tween the Dew Points of an IR measured surface and the ambient air.
Its sensors are retractable to protect them when they are not in use.
Features include
• Triple LCD digital display
• I n f rared temperature measurement with adjustable emissivity
(Spot ratio 8:1)
• Built-in ambient-air temperature sensor
• Fast responding humidity sensor
• Wet Bulb - continuously updated
• Dew Point - continuously updated
• Differential dew-point function
(surface temperature to dew-point differential)
• Backlit display
• Low battery indication
• Accurate and reliable microprocessor circuitry
• Auto power off with adjustable power-off timer
• Environmentally protected (retractable) sensor-set
Safety Notes
Before using this meter, read all safety information carefully. In
this manual the word
"WARNING"
is used to indicate conditions
or actions that may pose physical hazards to the user. The word
"CAUTION"
is used to indicate conditions or actions that may
damage this instrument.
WARNING!
DO NOT point the laser toward the eyes or face of a person or animal.
Laser light can cause eye injury, if the beam makes direct eye contact.
Reflective laser light can also cause damage, if a mirror or a glass-like
surface reflects the beam directly into the eye. Laser’s potential to
cause damage is retained for hundreds of feet. Use caution.
C o n t rols and Indicators
1.
Key:
Press to activate infrared (IR) thermometer
(to measure surface tempera t u r e ) .
•
IR temperature is stored on the top line of the display
when key is released
• Differential dew point must not be displayed to take infrared
t e m p e rature measurements with sensor-set retra c t e d
Press and at the same time to turn ON/OFF
laser targeting function.
2.
Key:
Press to turn ON/OFF ambient temperature and
h u m i d i ty functions, independent of the infrared thermometer.
• Press to turn on
• Press for about 3 seconds to turn off
With the meter on, press to enter auto-off time and
emissivity settings.
• Use up or down arrow keys to change the settings - the
longer these are held, the faster they change
• Press the key to accept the change
3.
Key:
Press to turn ON/OFF the back light.
4.
Key:
Quickly press and release to select data to be
displayed on second line:
• Ambient Temperature, Dew Point or Wet Bulb
Press for about 2 seconds and release to turn ON/OFF the
differential-dew-point display on the top line.
• This feature allows you to use the last-taken infrared
measurement to determine if an object’s surface will create
condensation (i.e. a cold car going from outdoors into
a paint shop)
DTH51-MAN
P. 1
4
5
6
1
2
3
