6 Using the product
19
6.2. Performing the measurement
WARNING
Risk of injury caused by pressurized, hot, cold or toxic
refrigerants!
> Wear protective goggles and safety gloves.
> Before applying pressure to the measuring instrument: Always
fasten the measuring instrument on the suspension attachment
to prevent it from falling down (danger of breakage)
> Before each measurement check the refrigerant hoses for
flawless condition and correct connection. Do not use any tools
to connect the hoses, tighten hoses only hand-tight (max.
torque 5.0 Nm / 3.7ft*lb).
> Comply with the permissible measuring range (-1…50 bar).
Pay particular attention in systems with refrigerant R744, since
these are frequently operated with higher pressures.
6.2.1. Measuring
✓ The actions described in the chapter “Preparing for
measurement” have been performed.
The mode Pressure/Temperature is set as standard when
starting the device.
1. Apply pressure to the measuring instrument.
2. Read the measurement values.
With zeotropic refrigerants, the evaporation temperature
to/Ev is displayed after the complete evaporation / the
condensation temperature tc/Co is displayed after complete
condensation.
The measured temperature must be assigned to the
superheating or subcooling side (t
oh
<--> t
cu
). Dependent on
this assignment, the display will show t
oh
/T1 resp. ∆t
oh
/SH
or t
cu
/T2 resp. ∆t
cu
/SC, depending on the selected display.
- Reading and display illumination are flashing.
• 1 bar before the critical pressure of the refrigerant is
reached,
• when the max. permissible pressure of 49 bar is acceded.
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