Universal Enterprise DTH51 Installation Manual
1-800-547-5740 • Fax: (503) 643-6322
www.ueiautomotive.com • email: info@ueiautomotive.com
DTH51
INSTRUCTION MANUAL
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 twe en 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 r ared 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 r ols 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 fu nctions, 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
Infrared (IR) Thermometer
The infrared thermometer will measure from -40˚ to 932˚F
(-40˚ to 500˚C). Infrared readings provide measurements of only an
object’s surface. Many surfaces, like air vents, registers and grills
will quickly take on the temperature of the air moving past them at
their outermost surface. This “skin effect” allows an infrared (IR)
thermometer to provide you with inlet or outlet air temperature within
seconds of turning on an HVAC system. The distance to spot ratio of
the DTH51 is 8 to 1 (as explained in Fig 1).
1. The infrared thermometer function can be used independently of
the ambient temperature and humidity functions provided that the
differential dew point icon “ “ is not displayed at the left side
of the top line. When this icon is NOT present, you can take
infrared temperature measurements with the sensor-set retracted.
Simply press the “ “ push-button at any time to begin
taking readings.
2. To use the IR function in conjunction with the ambient
temperature and humidity functions, extend the sensor-set then
turn your meter on by pressing the “ “ push-button.
3. Press the “ “ push-button to measure the surface to
begin taking readings. The temperature that you last-measured
will be held on the top line of the LCD screen when you release
the button.
4. The last-measured IR temperature reading is used to calculate the
differential dew-point, based on the ambient temperature and
humidity sensors readings.
NOTE: All other temperature and humidity functions are based
on the measurements provided by the sensors in the sensor-set.
5. Key: Press to select between Centigrade or Fahrenheit
temperature readings in both the first and second lines.
• Use to increase auto-power-off time or emissivity settings
(item 2)
• Press and at the same time to disable
auto-power-off function
6. Key: Press and at the same time to
turn ON/OFF laser targeting function.
• Use to decrease auto-power-off time or emissivity settings (item 2)
LCD Display
7. IR Indicator
8. Emissivity
9. Battery Indicator
10.Surface Temperature
11. Air Temperature
12.Air Humidity
Operating Instructions
NOTE: The sensor-set must be extended prior to using this instrument
for any ambient air or humidity based measurements. To extend the
sensor-set, press it down, then release as shown. The sensor-set is
spring loaded and motion-dampened to ensure that it extends fully,
without stressing the components. Reverse the process to retract
the sensor-set.
IMPORTANT: Store your DTH51 with the sensor-set retracted to keep it
away from dust, dirt and other elements.
DTH51-MAN P. 2
Retracted
(push in to extend)
Extended
(Fig 1)
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11
12
7
8
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