Vaisala HUMICAP HMP45A - Spare Parts and Accessories

HMP45A and HMP45D
Operating Manual U274en-1.2
4
As the D (dry) and W (wet) adjustments may affect each other, check again
the humidity reading at the low end. If necessary, repeat the adjustments in
both the low and the high humidity points until the reading is correct.
3.3 Changing the HUMICAP
®
180 humidity sensor
Unscrew the filter. Remove the damaged sensor and mount a new
HUMICAP
®
180 humidity sensor in its place. Handle the sensor with care.
Calibrate the probe using a two-point calibration procedure. Note that if the
probe is not calibrated, the accuracy is still better than ±7 %RH.
4. SPARE PARTS AND ACCESSORIES
Order code Description
HUMICAP

180
Humidity sensor
18921 Temperature sensor Pt 1000 IEC 751 1/3 Class B (HMP45A)
19159 Temperature sensor Pt 100 IEC 751 1/3 Class B (HMP45D)
2787HM Membrane filter (standard)
6685 Sintered filter 37 µm
6686 Sintered filter 216 µm
6597 Plastic grid
HMP45ASP HMP45A probe head
HMP45DSP HMP45D probe head
HMH45ASP Probe handle for HMP45A and HMP45D
HMI41 Humidity and temperature indicator
HMH45 Probe handle for HMP45A with a connector to HMI41
HMK11 Humidity Calibrator
HMK13B Humidity Calibrator
5. TECHNICAL DATA
5.1 Humidity (HMP45A & HMP45D)
Measurement range 0.8...100 %RH
Output scale 0...100 %RH equals 0-1 VDC
Accuracy at +20 °C (including non-linearity and hysteresis):
against factory references ± 1 %RH
field calibration against references ± 2 %RH (0...90 %RH)
± 3 %RH (90...100 %RH)
Typical long-term stability better than 1 %RH per year
Temperature dependence ± 0.05 %RH/° C
Response time (90%) at +20 °C 15 s with membrane filter
Humidity sensor HUMICAP
®
180