D740 Control Panel
Operating Instructions
1.
TURN ON:
Press the ON/OFF button once to turn on and again to turn off.
NOTE:
Hold button down for approximately 1 second to turn unit off.
2.
WARM UP
: The detector automatically starts heating the sensor. During the
heating cycle, the digital leak size indicator will flash 0 and the detector will
sound a slow “beep”. Warm up is usually less than 20 seconds.
3.
READY
: The detector is ready to begin searching for leaks when the flashing 0
stops and the green sensitivity LED turns on (7g/yr setting).
The audio “beep”
increases in frequency and the probe LED begins to blink steadily.
4.
SEARCHING:
When searching for leaks, move the sensor tip along a/c lines
and fittings no further away than
3/8” and moving at approximately 3”/second. If
the detector alarms, make smaller sweeps back and forth until the leak source
can be pin pointed.
Note: The D740 only responds to changes in leak
concentration. The alarm will re-set automatically if the sensor tip is held
at the leak source. If the leak detector has been out of use for an
extended period, weeks or months, the following action is recommended.
Power on the instrument and allow it to come out of warm up. Then run it
with the sensitivity level in the Hi (high) position for several minutes
before testing it with the Leak Test Vial. This action will guarantee that
the sensor is fully conditioned for maximum response to refrigerant gas.
2
Digital Leak Size
Indicator
Low Battery
Indicator
Sensitivity Level Indicators
Audio Mute &
Sensitivity Level Selectors
Power
On/Off
2
