User manual VAISALA HMP45A

[. . . ] All legally binding commitments and agreements are included exclusively in the applicable supply contract or Conditions of Sale. U274en-1. 2 HMP45A and HMP45D Operating Manual 1. GENERAL The HMP45A and HMP45D probes are designed for the measurement of relative humidity and temperature. Humidity measurement is based on the capacitive thin film polymer sensor HUMICAP180. Temperature measurement is based on resistive platinum sensors (Pt 100 and Pt 1000). [. . . ] The handles of all HMP45A and HMP45 probes are fully interchangeable. If you wish to continue the measurement immediately, you can insert a calibrated probe head in place of the disconnected one; this way, the measurement is interrupted for less than a minute. 3. 1 Reading the outputs during calibration NOTE: remove the O-ring if you connect the probe directly to the HMI41 indicator adjustment trimmers: W = wet D = dry (T = temperature; for factory use only!) pull the probe head off the handle Figure 2 In calibration, the HMP45A/D output is normally read from the output cables. The HMP45A probe head can also be checked with Vaisala's HMI41 indicator (see Figure 2); the probe head can be connected either to the HMH45 handle, or directly to the HMI41 indicator. However, note that if you connect the probe head directly to the HMI41, you must first remove the O-ring. Measured humidity and temperature appear on the HMI41 display. A simple field check can also be performed when there seems to be something wrong with the measurement system. It is sufficient to compare the HMP45A reading with the reading measured by a calibrated reference probe head. Check 2 W D T MODE H O LD E NT ER O N /O F F HM H45 H M I4 1 Adjustment trimmers and probe head connection/disconnection U274en-1. 2 HMP45A and HMP45D Operating Manual the ambient relative humidity and temperature level with the reference probe head, and then connect the HMP45A probe head on the HMH45 handle and check the output readings. Prepare the HMI41 indicator for measurements with the HMP45A probe head as follows: turn the HMI41 indicator on and within 1-2 seconds press simultaneously buttons ENTER and MODE until the text SEtUP appears on the display. Wait a few seconds, and the text Unit appears; press ENTER repeatedly until a text similar to the following appears on the display: set Select PROBE TYPE 3 with buttons L (number up) or M (number down) and turn the indicator off. Turn it on again by pressing the ON/OFF button. After a few seconds, the relative humidity and temperature readings appear automatically on the display. The HMP45D cannot be used with the HMI41 indicator as the passive temperature signal results in error messages on the HMI41. 3. 2 Humidity calibration For a high-accuracy two-point calibration use a Vaisala HMK15 or HMK13B calibrator and saturated salt solutions as described in the respective manuals. Leave the calibrator, the HMI41 and the probe head in the same space for at least four hours so that their temperatures have time to equalize. The calibration is done first for the dry end and then for the wet end by adjusting trimmer potentiometers marked "D" (dry, <50 %RH) and "W" (wet, >50 %RH). [. . . ] 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 HUMICAP180 18921 19159 2787HM 6685 6686 6597 HMP45ASP HMP45DSP HMH45ASP HMI41 HMH45 HMK11 HMK13B Description Humidity sensor Temperature sensor Pt 1000 IEC 751 1/3 Class B (HMP45A) Temperature sensor Pt 100 IEC 751 1/3 Class B (HMP45D) Membrane filter (standard) Sintered filter 37 µm Sintered filter 216 µm Plastic grid HMP45A probe head HMP45D probe head Probe handle for HMP45A and HMP45D Humidity and temperature indicator Probe handle for HMP45A with a connector to HMI41 Humidity Calibrator Humidity Calibrator 5. 5. 1 TECHNICAL DATA 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 4 U274en-1. 2 HMP45A and HMP45D Operating Manual 5. 2 Temperature HMP45A Measurement range -39. 2. . . +60 °C Output scale -40. . . +60 °C equals 0. . . 1 VDC Accuracy at 20°C ±0. 2 °C Accuracy over the whole measurement range: 0. 5 0. 4 0. 3 0. 2 0. 1 0 -0. 1 -0. 2 -0. 3 -0. 4 -0. 5 -40 -30 -20 -10 0 10 20 30 40 50 60 °C Temperature sensor HMP45D Measurement range Output signal Temperature sensor 5. 3 General Operating temperature range Storage temperature range Supply voltage Settling time Power consumption Output load Weight Cable length Housing material Housing classification (electronics) Sensor protection (standard) Dimensions in mm (inches): Pt 1000 IEC 751 1/3 Class B -40. . . +60 °C resistive four wire connection Pt 100 IEC 751 1/3 Class B -40. . . +60 °C -40. . . +80 °C 7. . . 35 VDC 500 ms < 4 mA >10 kohm (to ground) 350 g (including package) 3. 5 m ABS plastic IP 65 (NEMA 4) membrane filter, part no. 2787HM 5 HMP45A and HMP45D Operating Manual U274en-1. 2 240 (9. 45) 118 (4. 65) A 24 18. 5 3500 (137. 8) A A-A 20. 5 (0. 81) (0. 94) 24 (0. 94) REMOVABLE PROBE HEAD ( 0. 72) (132 mm) 5. 4 Electromagnetic compatibility 5. 4. 1 Emissions Radiated interference, test setup according to EN55022 5. 4. 2 Test: Immunity Test setup according to: IEC 1000-4-3 IEC 801-4 Performance: Radiated interference Electrostatic discharge HMP45A level 1 (3V/m) HMP45D level 3 (10 V/m) level 4 (HMP45A&D) GUARANTEE Vaisala issues a guarantee for the material and workmanship of this product for one (1) year from the date of delivery. 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