Vaisala Calibration of Digital Transmitters with HMI41 Uživatelský manuál stáhnout pdf (Strana 17)

Chapter 3 _______________________________________________________________ Calibration

VAISALA _______________________________________________________________________ 15

One-Point Offset and Gain

Calibrations

Select the desired calibration with buttons ▲ and ▼. Select offset

calibration if the humidity is < 65%RH and gain calibration if the

humidity is > 65%RH:

Press ENTER to acknowledge the selection. A text similar to the

following appears on the display:

RH %

In following chapters, you will find instructions for performing offset

and gain calibrations in two different ways.

HMI41 as a Reference Meter

The HMI41 reference probe is used to show the correct humidity

value. Connect the cable and wait for the transmitter and reference

probe readings to stabilize; when both readings are stable, press

ENTER to conclude the calibration. When ENTER is pressed, the

transmitter reading is corrected to the HMI41 reference probe reading.

RH %

Numbers on the first line indicate the RH measured by the transmitter,

and numbers on the second line indicate the RH measured by the

reference probe. Let the readings stabilize.

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Vaisala Calibration of Digital Transmitters with HMI41 Uživatelský manuál Strana 17