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4.2.4 Flow Transducer Calibration
The flow measurement, while indicated on the screen, is not critical to the accuracy of the
generated humidity and is not used in the humidity calculations. Flow calibration accuracy
depends upon the requirements of the user.
Equipment Required:
1. Standard or Reference flowmeter (per section 4.2).
4.2.4.1 Flow Calibration Procedure
The calibration for the flowmeter is slightly different than for the temperatures and pressures,
and does not require the removal of the flowmeter from the system.
1) Using appropriate fittings, connect a flowmeter reference instrument to the chamber
inlet port of the system.
2) Generate 10 liters per minute at approximately 10% RH at 21 °C. Once stable, note
the readings of the reference flowmeter and of the indicated flow of the 2500.
3) Change the flow to 20 liters per minute and note both readings again.
4) Press [STOP]. Once the shutdown is complete, press [EDIT/CAL]. The following
menu appears.
5) Press [CAL]. The calibration menu appears.
CAL
EDIT
PRNT
REPT
DONE
TEMP
CAL
PRES
CAL
FLOW
CAL
DONE
