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Summary of Contents for Vaisala HUMICAP HMP140A Series
- Page 1 USER'S GUIDE ® Vaisala HUMICAP Humidity Transmitter Series HMP140A U175EN15...
- Page 2 The contents are subject to change without prior notice. Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user. All legally binding commitments and agreements are included exclusively in the applicable supply contract or Conditions of...
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Page 3: Table Of Contents
HMP140A SERIES U175en-1.5 Operating Manual Contents PRODUCT DESCRIPTION ....................1 TO BE NOTED WHEN MEASURING HUMIDITY ..............2 INSTALLATION........................3 Selecting the place of installation ................3 Mounting ........................3 3.2.1 Mounting the HMP141A................4 3.2.2 Mounting the HMP142A................4 3.2.3 Mounting the HMP143A................ - Page 4 HMP140A SERIES Operating Manual U175en-1.5 This page intentionally left blank. 1999-12-08...
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Page 5: Product Description
These versatile transmitters are also easy to install and to use. When necessary, they can be recalibrated on site with Vaisala’s HMI41 indicator equipped with an appropriate probe and optional calibration cable (19116ZZ). -
Page 6: To Be Noted When Measuring Humidity
HMP140A SERIES Operating Manual U175en-1.5 TO BE NOTED WHEN MEASURING HUMIDITY In the measurement of humidity and especially in calibration, it is essential that the temperature equilibrium is reached. Even a slight difference in the temperature between the measured object and the sensor causes an error. For example, at +20 C (+ 68 F) and 50 %RH, a temperature difference of +1 C between the measured object and the sensor causes an error of +3 %RH. -
Page 7: Installation
HMP140A SERIES U175en-1.5 Operating Manual INSTALLATION Selecting the place of installation Select a place that gives a true picture of the environment or process and is as clean as possible. Air should circulate freely around the sensor. A rapid air flow is recommended as it ensures the same temperature for the ambient air and the sensor head. -
Page 8: Mounting The Hmp141A
HMP140A SERIES Operating Manual U175en-1.5 3.2.1 Mounting the HMP141A The optimal installation of the HMP141A is with the sensor head pointing downwards. Upward mounting should be avoided due to internal heat transfer. 1. Mounting and wiring: cable feedthrough on the surface or in the connection box. -
Page 9: Mounting The Hmp143A
HMP140A SERIES U175en-1.5 Operating Manual Ø 12 Ø 15 Figure 3.2.2 Dimensions of the HMP142A (in mm) 3.2.3 Mounting the HMP143A The cable model HMP143A should also be mounted with the sensor head horizontally whenever possible. This model is provided with two plastic nuts and a gasket. -
Page 10: Electrical Connections
HMP140A SERIES Operating Manual U175en-1.5 Electrical connections The wiring can be done in either of the two ways shown in Figure 3.3. mounting on a juction box surface mount Tout SHIELD RHout Figure 3.3 Electrical connections Outputs 0...20 mA (4...20 mA) 20...35 VDC 17...24 VAC min. -
Page 11: Connectors And Potentiometers On The Main Pcb
HMP140A SERIES U175en-1.5 Operating Manual Connectors and potentiometers on the main PCB DISPLAY CONNECTOR PROBE CONNECTOR SHIELD Test connector for factory use; Tgain leave the jumper as indicated here Toffset Test connector for Spare one point calibration jumpers RHoffset Toutput Connectors selection for the... -
Page 12: Connection To An Ac Supply
HMP140A SERIES Operating Manual U175en-1.5 Connection to an AC supply The HMP140A transmitters can also be connected to an AC supply without an external rectifier. However, when two or more transmitters are connected to one 24 VAC transformer, a common loop is formed and there is an increased risk of a short-circuit. -
Page 13: Calibration
Location of the test connectors Two-point humidity calibration The calibration can also be done with the HMK11 or the HMK13B Calibrator, or the instrument can be sent to Vaisala or a Vaisala representative. 4.2.1 Two-point humidity calibration procedure Leave the calibrator and the transmitter for at least 30 minutes in the same space so that their temperatures have time to equalize. -
Page 14: Temperature Calibration
HMP140A SERIES Operating Manual U175en-1.5 Use the RH offset potentiometer (see Figure 4.2) to adjust the output signal to the value given in the calibration table (Chapter 4.4). Place the probe into the calibration hole of the NaCl bottle in the calibrator. -
Page 15: Calibration Table
HMP140A SERIES U175en-1.5 Operating Manual Calibration table Temperature °C °F LiCl 11.3 11.3 11.3 11.3 4...20 mA 5.81 5.81 5.81 5.81 0...20 mA 2.26 2.26 2.26 2.26 0...1 V 0.113 0.113 0.113 0.113 0...5 V 0.565 0.565 0.565 0.565 0...10 V 1.13 1.13 1.13... -
Page 16: Technical Data
HMP140A SERIES Operating Manual U175en-1.5 TECHNICAL DATA Relative humidity Measurement range 0...100 %RH Accuracy (including non-linearity and repeatibility) when calibrated against salt solutions (ASTM E104-85): 0...90 %RH +2 %RH 90...100 %RH +3 %RH Temperature dependence: dRH (%RH) -0.5 -1.5 T (°C) Response time (90%) 15 s at +20 C in still air (with sintered filter) Maximum error between... -
Page 17: General
HMP140A SERIES U175en-1.5 Operating Manual General Power supply current outputs: 20...35 VDC 17...24 VAC (ohm) min. 12 + 0...1 V 9...35 VDC 9...24 VAC 0...5 V 15...35 VDC 12...24 VAC 0...10 V 20...35 VDC 16...24 VAC Current consumption 6...10 mA + output currents Electrical connections screw terminals for 0.5 - 1.5 mm wires (AWG... -
Page 18: Electromagnetic Compatibility
HMP143A (see Appendix 3) 17039HM membrane filter 17038 plastic grid ® HUMICAP humidity sensor GUARANTEE Vaisala issues a guarantee for the material and workmanship of this product under normal operating conditions for one (1) year from the date of delivery. 1999-12-08... - Page 19 HMP140A SERIES U175en-1.5 Operating Manual Exceptional operating conditions, damage due to careless handling and mis- application will void guarantee. 1999-12-08...
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Page 21: Appendix 1: Current Output Module
HMP140A SERIES U175en-1.5 Appendix 1 APPENDIX 1: CURRENT OUTPUT MODULE Current module Spare jumpers T output selection RH output selection Figure 1 The current module is available only for HMP142A and HMP143A transmitters. To install the current module to connectors X15 and X16, first disconnect the jumpers (4 pcs). -
Page 23: Appendix 2: Settings Of The Local Display
HMP140A SERIES U175en-1.5 Appendix 2 APPENDIX 2: SETTINGS OF THE LOCAL DISPLAY °F RH/T °C Figure 1 Location of the RH/T button and the C/ F jumpers The reading on the local display (relative humidity or temperature) can be chosen by pressing the RH/T button beside the display. At power-up, the display always shows the relative humidity reading. - Page 24 HMI41 Appendix 2 HMI41-Uxxxen-1.1 1999-12-08...
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Page 25: Appendix 3: Hmp143A Probe Cable Extension
HMP140A SERIES U175en-1.5 Appendix 3 APPENDIX 3: HMP143A PROBE CABLE EXTENSION The cable of the HMP143A probe can be extended up to 100 metres with the help of the extension set including a junction box (part no. 19326) and a shielded six wire extension cable (part no. -
Page 26: Technical Data
HMP140A Appendix 3 U175en-1.5 TECHNICAL DATA Junction box (part no. 19326) Housing: material ABS plastic dimensions 65 x 50 x 35 mm (l x w x h) classification IP 65 temperature range -40...+80 °C Lead-throughs: size PG 9 cable diameter 4...7 mm housing classification IP 68... - Page 28 www.vaisala.com...
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