Campbell HMP155A User manual

Revision: 10/2021

Campbell Scientific, Inc.

Table of contents

1. Introduction 1

2. Precautions 1

3. Initial inspection 1

4. QuickStart 2

5. Overview 4

6. Specifications 5

6.1 Temperature sensor 7

6.2 Relative humidity sensor 8

7. Installation 8

7.1 Wiring to data logger 8

7.2 Data logger programming 10

7.2.1 VoltSE() instruction 10

7.2.2 VoltDiff() instruction 11

7.3 Mounting 11

7.3.1 Installation in a 41005-5 14-plate shield 13

7.3.2 Installation in a RAD14 14-plate shield 14

7.3.3 Mount the shield 14

8. Operation 15

8.1 Measurement 15

8.2 Long cable lengths 15

8.3 Absolute humidity 16

9. Troubleshooting and maintenance 17

9.1 Troubleshooting 17

9.2 Maintenance 17

9.2.1 Cleaning 18

9.2.2 Changing the probe filter 18

Table of Contents - i

10. References 19

Appendix A. Importing Short Cut code into CRBasic Editor 21

Appendix B. RS-485 output 22

B.1 SDM-SIO1A or SDM-SIO4A serial I/O module interface option 22

B.2 MD485 interface option 23

B.2.1 MD485 multidrop interface configuration 27

B.3 Numeric display 29

Table of Contents - ii

1. 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. All Campbell Scientific

data loggers are compatible.

NOTE:

This manual provides information only for CRBasic data loggers. For retired Edlog data logger

support, see an older manual at www.campbellsci.com/old-manuals .

2. Precautions

lREAD AND UNDERSTAND the Safety section at the back of this manual.

lCare should be taken when opening the shipping package to not damage or cut the cable

jacket. If damage to the cable is suspected, contact Campbell Scientific.

lAlthough the HMP155A is rugged, it should be handled as a precision scientific instrument.

lDo not touch the sensor element.

lSantoprene® rubber, which composes the black outer jacket of the cable, will support

combustion in air. It is used because of its resistance to temperature extremes, moisture,

and UV degradation. It is rated as slow burning when tested according to U.L. 94 H.B. and

passes FMVSS302. However, local fire codes may preclude its use inside buildings.

3. Initial inspection

lUpon receipt of the HMP155A, inspect the packaging and contents for damage. File

damage claims with the shipping company.

lThe model number and cable length are printed on a label at the connection end of the

cable. Check this information against the shipping documents to ensure the expected

product and cable length were received.

HMP155A Temperature and Relative Humidity Probe 1

4. QuickStart

A video that describes data logger programming using Short Cut is available at:

www.campbellsci.com/videos/cr1000x-data logger-getting-started-program-part-3 .Short

Cut is an easy way to program your data logger to measure the sensor and assign data logger

wiring terminals. Short Cut is available as a download on www.campbellsci.com . It is included

in installations of LoggerNet,RTDAQ, and PC400.

The following procedure also shows using Short Cut to program the HMP155A.

1. Open Short Cut and click Create New Program.

2. Double-click the data logger model.

3. In the Available Sensors and Devices box, type HMP155A or locate the sensor in the

Sensors >Meteorological >Relative Humidity & Temperature >HMP155 Temperature and

Relative Humidity Sensor folder. Double-click either HMP155 (constant power) or HMP155

(panel switched power); the panel switched power option uses less current but requires a

scan rate that is greater than 5 seconds. Data defaults to degree Celsius. This can be

changed by clicking the Deg C box and selecting Deg F, for degrees Fahrenheit, or Kfor

Kelvin.

HMP155A Temperature and Relative Humidity Probe 2

4. Click the Wiring tab to see how the sensor is to be wired to the data logger. Click OK after

wiring the sensor.

5. Repeat steps three and four for other sensors.

6. In Output Setup, type the scan rate, meaningful table names, and Data Output Storage

Interval.

NOTE:

The HMP155A has a five second settling time after power up; therefore the scan rate

must be greater than five seconds when using the panel switched power option.

HMP155A Temperature and Relative Humidity Probe 3

7. Select the measurement and its associated output option.

8. Click Finish and save the program. Send the program to the data logger if the data logger

is connected to the computer.

9. If the sensor is connected to the data logger, check the output of the sensor in the data

display in LoggerNet,RTDAQ, or PC400 to make sure it is making reasonable

measurements.

5. Overview

The HMP155A Temperature and Relative Humidity probe contains a platinum resistance

temperature detector (PRT) and a Vaisala HUMICAP®180 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 data loggers with model HMP155ACBL1 cable. The

HMP155A also has RS-485 outputs for temperature and relative humidity that can be directly

interfaced to the CR6 and CR1000X data logger using the HMP155ACBL2 cable. The RS-485

output can also be used with our CR800, CR850, CR3000, and CR1000 data loggers, but they

require both the HMP155ACBL2 cable and the SDM-SIO1A or SDM-SIO4A Serial I/O Module

(RS-485 output (p. 22)). The RS-485 output has a higher current drain than that listed in the

specifications.

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. At measurement rates slower than

once per 5 seconds, the overall power consumption (data logger and sensors) may be reduced

HMP155A Temperature and Relative Humidity Probe 4

by switching power to the HMP155A. Current Campbell Scientific data loggers have a built-in

switched 12VDC that can be used to control power.

NOTE:

HMP155A sensors purchased directly from Vaisala with serial numbers < E4430001 require

approximately 5 seconds warm up time.

Features:

lWell-suited for long-term, unattended applications

lAccurate and rugged

lCompatible with the following data loggers: CR6, CR1000X, CR800-series, CR300-series,

CR3000, CR1000

6. Specifications

Dimensions in mm [inches]

FIGURE 6-1. Probe dimensions

HMP155A Temperature and Relative Humidity Probe 5

8-Pin Connector

FIGURE 6-2. Wiring of HMP155A 8-pin connector

*HMP155ACBL1 Cable provided by Campbell Scientific

1 = VOUT1 (yellow, temp)

2 = no connection

3 = AGND (white)

4 = VOUT2 (blue, RH)

5 = no connection

6 = no connection

7 = VCC (red)

8 = GND (black)

– = SHIELD (clear)

*Note: HMP155ACBL2 for RS-485 is described in

RS-485 output (p. 22).

Operating temperature range for

humidity measurement: –80 to 60 °C (–112 to 140 °F)

Storage temperature range: –80° to 60 °C (–112 to 140 °F)

Electromagnetic compatibility: Complies with EMC standard EN61326-1, Electrical

equipment for measurement control and laboratory use

- EMC requirements for use in industrial locations

Filter: Sintered PTFE

Housing material: PC

Housing classification: IP66

HMP155A Temperature and Relative Humidity Probe 6

Weight: 86 g (3 oz)

Voltage outputs: 0 to 1 VDC

Average current consumption: <3 mA (analog output mode)

Operating voltage: 7 to 28 VDC

Settling time at power-up: 2 s

6.1 Temperature sensor

Measurement range: –80 to 60 °C (–112 to 140 °F)

Accuracy with voltage output

at –80 to 20 °C: ±(0.226 – 0.0028 x temperature) °C

at 20 to 60 °C: ±(0.055 + 0.0057 x temperature) °C

See the following graph:

Temperature sensor: Pt 100 RTD 1/3 Class B IEC 751

Response time (63 %) for additional

temperature probe in 3m/s air flow: 63% <20 s

90% <35 s

HMP155A Temperature and Relative Humidity Probe 7

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