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CSI HMP155A Instruction Manual

Temperature and relative humidity probe
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HMP155A Temperature
and Relative Humidity Probe
Revision: 6/15
C o p y r i g h t
©
1 9 9 0 - 2 0 1 5
C a m p b e l l
S c i e n t i f i c ,
I n c .

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Summary of Contents for CSI HMP155A

  • Page 1 HMP155A Temperature and Relative Humidity Probe Revision: 6/15 C o p y r i g h t © 1 9 9 0 - 2 0 1 5 C a m p b e l l S c i e n t i f i c ,...

  • Page 3: Limited Warranty

    Limited Warranty “Products manufactured by CSI are warranted by CSI to be free from defects in materials and workmanship under normal use and service for twelve months from the date of shipment unless otherwise specified in the corresponding product manual. (Product manuals are available for review online at www.campbellsci.com.) Products not manufactured by CSI, but that are resold...
  • Page 4 Assistance Products may not be returned without prior authorization. The following contact information is for US and international customers residing in countries served by Campbell Scientific, Inc. directly. Affiliate companies handle repairs for customers within their territories. Please visit www.campbellsci.com to determine which Campbell Scientific company serves your country.
  • Page 5 Precautions DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS, TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE.

  • Page 7: Table Of Contents

    Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Introduction ..............1 2. Cautionary Statements ..........1 3. Initial Inspection ............1 Ships With ....................
  • Page 8 Cable routed through the connector cover ......... 11 7-3. Cable connected to the sensor ............12 7-4. HMP155A with connector cover in place and without protective cap ....................12 7-5. HMP155A and 41005-5 14-plate radiation shield (left) and RAD14 (right) on a tripod mast ............. 13 7-6.

  • Page 9: Introduction

    Humidity Probe Introduction The HMP155A probe monitors relative humidity (RH) for the range of 0 to 100% RH and temperature for the range of –80 to 60 °C. It provides reliable measurements for a wide range of applications as part of a weather station system or as a single instrument.

  • Page 10: Ships With

    HMP155ATemperature and Relative Humidity Probe Ships With The HMP155A ships with: (1) Adjustment Screwdriver from manufacturer (1) Calibration Sheet (1) Instruction Manual or ResourceDVD Quickstart Short Cut is an easy way to program your datalogger to measure the HC2S3 sensor and assign datalogger wiring terminals. Use the following procedure to get started.
  • Page 11 HMP155A Temperature and Relative Humidity Probe 4. Select Datalogger Model and Scan Interval (default of 5 seconds is OK for most applications). Click Next. 5. Under the Available Sensors and Devices list, select the Sensors | Meteorological | Relative Humidity & Temperature | HMP155 Temperature and Relative Humidity Sensor folder.

  • Page 12: Overview

    (PRT) and a Vaisala HUMICAP  capacitive relative humidity sensor. The HMP155A outputs a 0 to 1 Vdc signal for temperature and relative humidity that can be measured by all models of Campbell Scientific dataloggers with model HMP155ACBL1 cable. The HMP155A also has RS-485 outputs for temperature and relative humidity that can be interfaced to the CR6 datalogger with the HMP155ACBL2 cable.

  • Page 13: Specifications

    HMP155A Temperature and Relative Humidity Probe The HMP155A can be powered continuously, or the power may be switched to conserve battery life. The HMP155A consumes less than 3 milliamps current at 12 Vdc. Approximately 2 seconds is required for the sensor to warm up after power is switched on.

  • Page 14: Wiring Of Hmp155A 8-Pin Connector

    HMP155ATemperature and Relative Humidity Probe 8-Pin Connector 0507-044 FIGURE 6-2. Wiring of HMP155A 8-pin connector *HMP155ACBL1 Cable provided by Campbell Scientific 1 = V 1 (yellow, temp) 2 = no connection 3 = A (white) 4 = V 2 (blue, RH)

  • Page 15: Temperature Sensor

    HMP155A Temperature and Relative Humidity Probe Inputs and Outputs Voltage outputs: 0 to 1 V Average current consumption: <3 mA (analog output mode) Operating voltage: 7 to 28 Vdc Settling time at power-up: Temperature Sensor Measurement range: –80 to 60 °C (–112 to 140 °F) Accuracy with voltage output at –80 to 20 °C:...

  • Page 16: Installation

    (p. 2) Cut tutorial. Wiring to Datalogger The HMP155A probe can be measured with two single-ended or differential analog input channels. Differential measurements are recommended for cable lengths greater than 6.1 m (20 ft). See Section 8.2, Long Cable Lengths (p.

  • Page 17: Datalogger Programming

    HMP155A Temperature and Relative Humidity Probe When measuring HMP155A with single-ended CAUTION measurements, the white and black leads must both be connected to ⏚. Doing otherwise will connect the datalogger’s analog and power ground planes to each other, which in some cases can cause offsets on low-level analog measurements.

  • Page 18: Voltse() Instruction

    When cable lengths are longer than 6.1 meters or when the sensor is constantly powered, the VoltDiff() measurement instruction is used to measure the HMP155A sensor. The HMP155A output scale is 0 to 1000 millivolts for the temperature range of -80 to 60 °C and for the relative humidity range of 0 to 100%.

  • Page 19: Hmp155A In Shipping Box

    • Adjustable wrench with a minimum 1-7/8 inch jaw size To install the HMP155A, you will need the 41005-5 or RAD14 14-Plate Radiation Shield. The HMP155A is packaged with a white connector cover and a yellow sensor head protective cap. See FIGURE 7-1.

  • Page 20: Installation In A 41005-5 14-Plate Shield

    HMP155ATemperature and Relative Humidity Probe 3. Attach the cable to the mating connector on the bottom of the HMP155A (see FIGURE 7-3). FIGURE 7-3. Cable connected to the sensor 4. Slide the white connector cover over the connector and gently push it up as far as it will go.

  • Page 21: Operation

    FIGURE 7-6. HMP155A and 41005-5 14-plate radiation shield on a CM200-series crossarm Operation Measurement The HMP155A uses a 100 Ω PRT to measure temperature and a Vaisala HUMICAP 180 capacitive sensor to measure relative humidity. Campbell  Scientific dataloggers measure the analog voltage outputs of the HC2S3 Temperature and Relative Humidity Probe with either the VoltSE() or VoltDiff() measurement instruction.

  • Page 22: Long Cable Lengths

    The HMP155A draws approximately 4 mA when it is powered. The wire used in the HMP155A (pn 9721) has resistance of 27.7 Ω/1000 ft. Since the signal reference and the power ground are both connected to ground at the datalogger, the effective resistance of those wires together is half of 27.7 Ω/1000 ft, or 13.9...

  • Page 23: Troubleshooting And Maintenance

    (Section 7.2, Datalogger Programming (p. 9) Maintenance The HMP155A probe requires minimal maintenance. Check monthly to make sure the radiation shield is free from debris. The white screen at the tip of the probe should also be checked for contaminates.

  • Page 24: Cleaning

    Recalibrate the HMP155A annually. Refer to the Assistance page at the beginning of this document for the procedure for returning the HMP155A to the factory to get recalibrated. 9.2.1 Cleaning Clean the probe with a soft, lint-free cloth moistened with mild detergent.

  • Page 25: References

    Stations and Networks in the United States and Canada: A Preliminary Survey, Bulletin Am. Meteor. Soc., 73, No. 4, 449-457. Vaisala, Inc. (2008) HMP155A Humidity and Temperature Probe User Guide, Helsinki, Finland. Text and figures used with permission of Vaisala, Inc.
  • Page 26 HMP155ATemperature and Relative Humidity Probe...

  • Page 27: Importing Short Cut Code

    Appendix A. Importing Short Cut Code This tutorial shows: How to import a Short Cut program into a program editor for • additional refinement How to import a wiring diagram from Short Cut into the comments of • a custom program A.1 Importing Short Cut Code into a Program Editor Short Cut creates files that can be imported into CRBasic Editor.
  • Page 28 Appendix A. Importing Short Cut Code After pasting, edit the information such that a ' character (single quotation mark) begins each line. This character instructs the datalogger compiler to ignore the line when compiling the datalogger code.

  • Page 29: Example Programs

    Shield 'CR1000 program to measure HMP155A with single-ended measurements Public AirTC Public DataTable(Temp_RH,True,-1) DataInterval(0,60,Min,0) Average(1,AirTC,IEEE4,0) Sample(1,RH,IEEE4) EndTable BeginProg Scan(5,Sec,1,0) 'HMP155A Temperature & Relative Humidity Sensor measurements AirTC and RH: PortSet (9,1) Delay(0,2,Sec) VoltSE(AirTC,1,mV2500,2,0,0,_60Hz,.14,-80) VoltSE(RH,1,mV2500,1,0,0,_60Hz,0.1,0) PortSet (9,0) RH>100 RH<108 Then RH=100...

  • Page 30: Differential Measurement Example

    Shield 'CR1000 program to measure HMP155A with differential measurements Public AirTC Public DataTable(Temp_RH,True,-1) DataInterval(0,60,Min,0) Average(1,AirTC,IEEE4,0) Sample(1,RH,IEEE4) EndTable BeginProg Scan(5,Sec,1,0) 'HMP155A Temperature & Relative Humidity Sensor measurements AirTC and RH: PortSet (9,1) Delay(0,2,Sec) VoltDiff (AirTC,1,mV2500,2,True,0,_60Hz,.14,-80) VoltDiff (RH,1,mV2500,1,True,0,_60Hz,0.1,0) PortSet (9,0) RH>100 RH<108...

  • Page 31: Mean Vapor Pressure Example

    Public AirTC Public Public RH_Frac, e_Sat, e_kPa DataTable(Temp_RH,True,-1) DataInterval(0,60,Min,0) Average(1,AirTC,IEEE4,0) Sample(1,RH,IEEE4) Sample(1,e_kPa,IEEE4) EndTable BeginProg Scan(5,Sec,1,0) 'HMP155A Temperature & Relative Humidity Sensor measurements AirTC and RH: PortSet (9,1) Delay(0,2,Sec) VoltSE(AirTC,1,mV2500,2,0,0,_60Hz,.14,-80) VoltSE(RH,1,mV2500,1,0,0,_60Hz,0.1,0) PortSet (9,0) RH>100 RH<108 Then RH=100 'Calculate Vapor Pressure 'Convert RH percent to RH Fraction RH_Frac = RH * 0.01...
  • Page 32 Appendix B. Example Programs...

  • Page 33: Interfacing With Hmp155A Rs-485 Output

    Appendix C. Interfacing with HMP155A RS-485 Output C.1 RS-485 Interface Options The HMP155A outputs a 0 to 1 Vdc signal for temperature and relative humidity that can be measured by all models of Campbell Scientific dataloggers with model HMP155ACBL1 cable. The HMP155A also has...
  • Page 34 Appendix C. Interfacing with HMP155A RS-485 Output ‘CR1000 Series Datalogger ‘Sensor Wiring: ‘HMP155A with RS-485 Output: ‘ ‘ HMP155A HMP155A SDM-SIO1 CR1000 Connector Pin-Out ‘ CSI Vaisala ‘ *Cable Cable ‘ blue pink ‘ yellow brown ‘ black ‘ red blue ‘...
  • Page 35 Appendix C. Interfacing with HMP155A RS-485 Output The public variables for temperature and relative humidity can be viewed in the ‘Numeric Display’ mode as shown below. For troubleshooting purposes, the serial data buffer in the datalogger can be viewed using the ‘W’ terminal command. This is done by connecting to the datalogger from the ‘Connect’...

  • Page 36: Md485 Multidrop Interface Option

    The MD485 Multidrop Interface can be used to interface the RS-485 outputs of the HMP155A to the datalogger’s CS I/O port. Connect the MD485’s CS I/O port to the datalogger’s CS I/O port with an SC12 cable. Sensor wiring to the MD485 and the datalogger is documented in the example program below.
  • Page 37 Use the Device Manager in Windows to determine which COM port the USB/RS-485 cable was assigned: Configure Windows HyperTerminal for the appropriate COM port (for example, COM8 in the example above) for the default HMP155A RS-485 settings of 4800 baud, 7, E, 1.

  • Page 38: Md485 Multidrop Interface Configuration

    Appendix C. Interfacing with HMP155A RS-485 Output Using HyperTerminal, send the following commands to the HMP155A: VERS[enter] to get a response from the sensor; for example, HMP155A 1.26 SERI[enter] to get the current RS-485 settings; for example, 4800 E 7 1 SERI 9600 N 8 1[enter] to change the RS-485 settings;...

  • Page 39: Cr1000 Example Program For Use With Md485

    Appendix C. Interfacing with HMP155A RS-485 Output Connect the MD485’s CS I/O port to the datalogger’s CS I/O port using an SC12 cable. Use the HMP155ACBL2 to connect the HMP155A sensor to the MD485 and the datalogger (CR1000, CR800, or CR3000) as shown in the following table.
  • Page 40 Appendix C. Interfacing with HMP155A RS-485 Output 'CR1000 Series Datalogger 'Change HMP155A default serial settings from 4800,E,7,1 To 9600,N,8,1: ' Sensor Wiring: ' *CSI cable Vaisala cable MD485 CR1000 Connector Pin-Out ' blue pink ' yellow brown ' black ' red...
  • Page 41 Appendix C. Interfacing with HMP155A RS-485 Output The public variables for temperature and relative humidity can be viewed in the ‘Numeric Display’ mode as shown below. For troubleshooting purposes, the serial data buffer in the datalogger can be viewed using the ‘W’ terminal command. This is done by connecting to the datalogger from the ‘Connect’...
  • Page 42 Appendix C. Interfacing with HMP155A RS-485 Output C-10...
  • Page 44 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) Campbell Scientific Centro Caribe S.A. (CSCC) 815 West 1800 North 300 N Cementerio, Edificio Breller Logan, Utah 84321 Santo Domingo, Heredia 40305 UNITED STATES COSTA RICA www.campbellsci.com • info@campbellsci.com www.campbellsci.cc • info@campbellsci.cc Campbell Scientific Africa Pty. Ltd. (CSAf) Campbell Scientific Ltd.

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