Specifications

Dual and differential temperature for effi cient testing of HVAC systems
Whether you’re installing, maintaining or
troubleshooting heating, ventilation and
air-conditioning (HVAC) systems in cars,
offi ces, factories, stores or homes,
temperature measurements are crucial.
For example, to ensure boiler temperature
meets safety requirements, you’d have to
measure boiler and air temperature
simultaneously to get accurate real-time
Solar heating system
Air-conditioning system
Controller
Solar collector
To taps
Pump
Cold water feed
Evaporator
Evaporator blower
Warm return air in
Warm air out
Condenser
Condenser fan
Ambient (outside) air in
Compressor
Expansion valve
Metering
device
Cool supply
air out
Boiler
Tank
readings. With a faulty air conditioning
system, viewing the temperature differ-
ence between warm return air and cool
supply air helps reveal the cooling behavior
of the evaporator with respect to time.
With the U1240 Series, you need just one
instrument for convenient, effi cient dual
and differential temperature measurements.
Specifi cations of the U1240 Series Digital Multimeters
U1241B U1242B
Display
Counts 10,000 10,000
Analog bar graph Yes Yes
Backlight Dual-intensity Dual-intensity
Back features
True RMS AC AC
Basic DCV accuracy 0.09% 0.09%
Auto/manual ranging Yes Yes
Measurements
Voltage AC/DC 1000 V 1000 V
Current AC/DC 10 A (down to microamps) 10 A (down to microamps)
Resistance 100 MΩ 100 MΩ
Frequency
200 kHz 200 kHz
Capacitance 0.1 nF to 10 mF 0.1 nF to 10 mF
Temperature 1000 °C, K-type thermocouple 1000 °C, K-type thermocouple, T1/T2/T1-T2
Continuity with beeper Yes Yes
Diode test Yes Yes
4-20 mA % scale Yes Yes
Harmonic ratio N/A Yes
Switch counter Yes Yes
Data management
Min/Max/Avg recording Yes Yes
Data hold Yes Yes
Null Yes Yes
Connectivity IR-USB/Bluetooth IR-USB/Bluetooth
Data logging
N/A 100 manual, 200 interval points
represents key specifi cations/features
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