Leak Detection On Air Conditioners - mru 400DH User Manual

4.5. Leak detection on air conditioners

The RF400 interchangeable sensor is used for leak detection on air conditioning
units.
The detected refrigerants are FCKW, HFCKW, FKW, HFKW and HFO.
After the warm-up time of 55 seconds, the measuring window opens automatically
and the measurement begins.
If necessary, reset the zero point with the F2 key.
Slowly guide the sensor along the points to be tested. If there is a leak, the meas-
ured value changes and the flashing frequency of the red LED in the sensor foot in-
creases with the increase in the measured gas concentration.
Functions in the Context menu
function
Signal ON (Key F1)
Signal ON (Key F1)
Zero point (Key F2)
Max = 0 (Key F3)
Reset
Setting
Printout (Dr)
Meas. menu (ESC)
Info
Choice ( >>) ( <<)
„Arrows right/left"
Settings:
To trigger signals (signal ON / signal -OFF), the desired signal thresholds must be
set separately for all gases in the context menu/settings.
Refrigerant/Gases
R134a [ppm]
H [ppm]
2
R32 [ppm]
R1234ze [ppm]
Technical Specification:
Sensor RF400
Ref. refrigerant
Detect. refrigerant
Measuring range
Resolution
Detection limit
Response time
MRU GmbH, D-74172 Neckarsulm
USER MANUAL 400DH
explanation
With this function the signal is switched on.
With this function the signal is switched off.
With this function the sensor is zeroed.
The value Max is set to zero.
This function resets the graphic.
Setting units and signal thresholds
Printout is generated, a printer is required for this
function.
Exit measuring program
The information (sensor name, page number, firmware
version) about the sensor is displayed here.
Switching between the gases
Adjustable signal thresholds
5 ... 100 ppm
5 ... 100 ppm
5 ... 100 ppm
5 ... 100 ppm
R134a, H2, R32, R1234ze
FCKW, HFCKW, FKW, HFKW, HFO
0 ... 1.000 ppm
1 ppm
3 g/a (R134a)
< 3 sec.
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