Vaisala PTU200 Instrukcja Użytkownika Pobierz pdf (Strona 42)

USER'S GUIDE_______________________________________________________________________

38 ___________________________________________________________________ M210195EN-A

Humidity

Calibration of the HMP45A-P/D probes should be performed at

regular intervals, depending on the conditions of use and desired

accuracy. The recommended calibration interval is one year.

The HMP45A-P/D probes are easy to maintain, calibrate and adjust.

The probe consists of a probe head and a handle with cable. All

calibration electronics are in the probe head, which can be

disconnected from the handle without disconnecting the wires. The

probe heads are interchangeable.

pull the probe head

off the handle

adjustment trimmers:

W = wet D = dry

(T for factory use only!)

FIGURE 6-2 Adjustment trimmers and probe head connection/

disconnection

Humidity adjustment

For a high-accuracy two-point adjustment, use a Vaisala HMK15 or

HMK13B calibrator and saturated salt solutions as described in the

respective manuals. If there is no local display, read the outputs via

the serial line.

Leave the calibrator and the probe head in the same space for at least

four hours so that their temperatures have time to equalize. Unscrew

the plastic grid of the probe.

The adjustment is done first for the dry end and then for the wet end

with trimmer potentiometers marked “D” (dry, <50 %RH) and “W”

(wet, >50 %RH). The potentiometers are located under a protective

plug; see FIGURE 6-2. Use a ceramic screwdriver with 2.5 mm blade for

adjusting the potentiometers. Note: if zero point is adjusted in

Nitrogen (N

), the minimum output signal of 0.008 V corresponds to a

relative humidity of 0.8 %RH.

TABLE 6-2 Greenspan’s calibration table

Temperature °C 15 20 25 30 35

LiCl %RH *) 11.3 11.3 11.3 11.3

NaCl %RH 75.6 75.5 75.3 75.1 74.9

%RH 97.9 97.6 97.3 97.0 96.7

*) Do not use or store the LiCl solution in temperatures below +18°C as its humidity

equilibrium may change permanently

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 63 64

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