Campbell HMP45C Manuel utilisateur

INSTRUCTION MANUAL

Model HMP45C Temperature

and Relative Humidity Probe

Revision: 2/07

Campbell Scientific Australia Pty Ltd

Warranty and Assistance

The MODEL HMP45C TEMPERATURE AND RELATIVE HUMIDITY

PROBE is warranted by CAMPBELL SCIENTIFIC AUSTRALIA Pty Ltd. to be

free from defects in materials and workmanship under normal use and service for

twelve (12) months from date of shipment unless specified otherwise. Batteries

have no warranty. CAMPBELL SCIENTIFIC AUSTRALIA Pty Ltd’s obligation

under this warranty is limited to repairing or replacing (at CAMPBELL

SCIENTIFIC AUSTRALIA Pty Ltd.'s option) defective products. The customer

shall assume all costs of removing, reinstalling, and shipping defective products

to CAMPBELL SCIENTIFIC AUSTRALIA Pty Ltd. CAMPBELL SCIENTIFIC

AUSTRALIA Pty Ltd will return such products by surface carrier prepaid. This

warranty shall not apply to any CAMPBELL SCIENTIFIC AUSTRALIA Pty

Ltd. products which have been subjected to modification, misuse, neglect,

accidents of nature, or shipping damage. This warranty is in lieu of all other

warranties, expressed or implied, including warranties of merchantability or

fitness for a particular purpose. CAMPBELL SCIENTIFIC AUSTRALIA Pty

Ltd. is not liable for special, indirect, incidental, or consequential damages.

Products may not be returned without prior authorization. The following

contact information is for Australia and International customers residing in

countries served by CAMPBELL SCIENTIFIC AUSTRALIA Pty Ltd. directly.

Affiliate companies handle repairs for customers within their territories. Please

visit

www.campbellsci.com to determine which Campbell Scientific company

serves your country. To obtain a Returned Materials Authorization (RMA),

contact CAMPBELL SCIENTIFIC AUSTRALIA Pty Ltd., phone (07) 4772

0444. After an applications engineer determines the nature of the problem, an

RMA number will be issued. Please write this number clearly on the outside of

the shipping

container. CAMPBELL SCIENTIFIC's shipping address is:

CAMPBELL SCIENTIFIC AUSTRALIA Pty Ltd

RMA#_____

16 Somer St

Hyde Park, QLD 4812

Australia

HMP45C Table of Contents

PDF viewers note: These page numbers refer to the printed version of this document. Use

the Adobe Acrobat® bookmarks tab for links to specific sections.

1. General Description...............................1

2. Specifications…......................................2

2.1 Temperature Sensor ......................................................................2

2.2 Relative Humidity Sensor..............................................................2

3. Installation...............................................3

3.1 Siting..............................................................................................3

3.2 Assembly and Mounting................................................................3

4. Wiring......................................................5

5. Example Programs….............................6

6. Long Lead Lengths................................9

7. Absolute Humidity................................12

8. Sensor Maintenance.............................14

9. Troubleshooting ..................................15

10. References .........................................15

Figures 3-1. HMP45C and 41003-5 Radiation Shield on a Tripod Mast ................4

3-2. HMP45C and 41003-5 Radiation Shield on a CM200 Series Crossarm.4

Tables 1-1. Recommended Lead Lengths.............................................................. 1

4-1. Connections for Single-Ended Measurements.................................... 5

4-2. Connections for Differential Measurements....................................... 6

4-3. Power Connections using SW12V Peripherals................................... 6

5-1. Calibration for Temperature ............................................................... 7

5-2. Calibration for Relative Humidity ..................................................... 7

5-3. Wiring for Single-ended Measurement Examples.............................. 7

6-1. Wiring for Differential Measurement Examples ............................. 10

7-1. Wiring for Vapor Pressure Examples .............................................. 13

8-1. Chemical Tolerances of HMP45C.................................................... 16

Model HMP45C Temperature and

Relative Humidity Probe

(1) General Description

The HMP45C Temperature and Relative Humidity probe contains a Platinum

Resistance Temperature detector (PRT) and a Vaisala HUMICAP® 180

capacitive relative humidity sensor.

The -L option on the model HMP45C Temperature and Relative Humidity

probe (HMP45C-L) indicates that the cable length is user specified. This

manual refers to the sensor as the HMP45C.

The HMP45C can be powered continuously or the power may be switched to

conserve battery life. The HMP45C consumes less than 4 milliamperes current

at 12 volts. Approximately 0.15 seconds is required for the sensor to warm up

after power is switched on. At measurement rates slower than once per

second, the overall power consumption (datalogger and sensors) may be

reduced by switching power to the HMP45C. Most current Campbell

Scientific dataloggers have a built-in switched 12 volts that can be used to

control power.

The CR9000, CR510, CR500, CR7, CR10 and 21X dataloggers do not have a

built-in switched 12 volts. Users with these dataloggers can power the sensor

continuously or purchase the model SW12V to switch power.

Lead length for the HMP45C is specified when the sensor is ordered. Table 1-1

gives the recommended lead length for mounting the sensor at the top of

the tripod/tower with a 2 foot crossarm. Lead length can be 2 feet shorter

when the sensor is mounted to the tripod mast / tower leg without a crossarm.

The HMP45C ships with:

(1) Adjustment Screwdriver from mfg

(1) Calibration Sheet

(1) Instruction Manual

TABLE 1-1. Recommended Lead Lengths

CM6 CM10 CM110 CM115 CM120 UT10 UT20 UT30

11’ 14’ 14’ 19’ 24’ 14’ 24’ 37’

Model HMP45C Temperature and Relative Humidity Probe

2. Specifications

Operating Temperature: -40°C to +60°C

Storage Temperature: -40°C to +80°C

Probe Length: 25.4 cm (10 in.)

Probe Body Diameter: 2.5 cm (1 in.)

Filter: 0.2 μm Teflon membrane

Filter Diameter: 1.9 cm (0.75 in.)

Power Consumption: <4 mA @ 12 V

Supply Voltage: 7 to 35 VDC

Settling Time: 0.15 seconds

2.1 Temperature Sensor

Sensor: 1000 ΩPRT, IEC 751 1/3 Class B

Temperature Measurement Range: -40°C to +60°C

Temperature Output Signal range: 0.008 to 1.0 V

Temperature Accuracy:

2.2 Relative Humidity Sensor

Sensor: HUMICAP® 180

Relative Humidity Measurement Range: 0 to 100% non-condensing

RH Output Signal Range: 0.008 to 1 VDC

Accuracy at 20°C

±2% RH (0 to 90% Relative Humidity)

±3% RH (90 to 100% Relative Humidity)

Temperature Dependence of Relative Humidity Measurement: ±0.05% RH/°C

Typical Long Term Stability: Better than 1% RH per year

Response Time (at 20°C, 90% response): 15 seconds with membrane filter

NOTE The black outer jacket of the cable is Santoprene® rubber. This

compound was chosen for its resistance to temperature extremes,

moisture, and UV degradation. However, this jacket will

support combustion in air. It is rated as slow burning when

tested according to U.L. 94 H.B. and will pass FMVSS302.

Local fire codes may preclude its use inside buildings.

Model HMP45C Temperature and Relative Humidity Probe

3. Installation

3.1 Siting

Sensors should be located over an open level area at least 9 m (EPA) in

diameter. The surface should be covered by short grass, or where grass does

not grow, the natural earth surface. Sensors should be located at a distance of

at least four times the height of any nearby obstruction, and at least 30 m

(EPA) from large paved areas. Sensors should be protected from thermal

radiation, and adequately ventilated.

Standard measurement heights:

1.5 m +/- 1.0 m (AASC)

1.25 – 2.0 m (WMO)

2.0 m (EPA)

2.0 m and 10.0 m temperature difference (EPA)

See Section 10 for a list of references that discuss temperature and relative

humidity sensors.

3.2 Assembly and Mounting

Tools Required:

• 1/2” open end wrench

• small screw driver provided with datalogger

• UV resistant cable ties

• small pair of diagonal-cutting pliers

The HMP45C must be housed inside a radiation shield when used in the field.

The 41003-5 Radiation shield has a U-bolt for attaching the shield to tripod

mast / tower leg (Figure 3-1), or CM200 series crossarm (Figure 3-2). The

radiation shield ships with the U-bolt configured for attaching the shield to a

vertical pipe. Move the U-bolt to the other set of holes to attach the shield it to

a crossarm.

Loosen the split-nut on the bottom plate of the 41003-5. Remove the yellow

protective cap on the HMP45C, and insert the sensor into the shield. Tighten

the split-nut to secure the sensor in the shield. Route the sensor cable to the

instrument enclosure. Secure the cable to the tripod/tower using cable ties.

The HMP45C must be housed inside a radiation shield when used in the field.

The 41003-5 Radiation Shield (Figure 3-1 and 3-2) mounts to a tripod mast, tower leg,

or CM200 series crossarm.

Model HMP45C Temperature and Relative Humidity Probe

FIGURE 3-1. HMP45C and 41003-5 Radiation Shield on a Tripod Mast

FIGURE 3-2. HMP45C and 41003-5 Radiation Shield on a CM200 Series Crossarm

CM200 Series Crossarm

41003-5

Split Nut

U-

Model HMP45C Temperature and Relative Humidity Probe

4. Wiring Connections to Campbell Scientific dataloggers are given in Tables 4-1

through 4-3. The probe can be measured by two single-ended or differential

analog input channels.

When measuring the HMP45C with single-ended

measurements, the purple or white and black leads must

both be connected to AG on the CR10(X) and

CR500/CR510 or to on the CR1000, CR5000, and

CR23X. 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. To avoid 4 mA flowing into analog ground,

switch the sensor on/off for its own measurement.

CAUTION

TABLE 4-1. Connections for Single-Ended Measurements

CR1000,

CR3000,

CR800, CR10,

CR5000, CR510,

Color Description CR10X CR23X CR500 21X, CR7

Yellow Temperature Single-Ended Single-Ended Single-Ended Single-Ended

Signal Input Input Input Input

Blue Relative Humidity Single-Ended Single-Ended Single-Ended Single-Ended

Signal Input Input Input Input

Purple Signal Reference AG

Black Power Ground AG

Shield Shield G

Red Power 12V 12V 12V 12V

Oran

e Power Control Control Port Control Control Port Control

Model HMP45C Temperature and Relative Humidity Probe

5. Example Programs

This section is for users who write their own datalogger programs. A

datalogger program to measure this sensor can be created using Campbell

Scientific’s Short Cut Program Builder software. You do not need to read this

section to use Short Cut.

The temperature and relative humidity signals from the HMP45C can be

measured using a single-ended analog measurement or a differential analog

measurement.

Use a single-ended analog measurement when the HMP45C signal lead length

is less than 6.1 m (20 ft.) or if the probe will be turned on and off under

datalogger control between measurements. For lead lengths greater than 6.1 m

(20 ft.) or when the probe will be continuously powered, use a differential

analog measurement. For a discussion on errors caused by long lead lengths

see Section 6.

TABLE 4-2. Connections for Differential Measurements

CR1000,

CR3000,

CR800, CR10,

CR5000, CR510,

Color Description CR10X CR23X CR500 21X, CR7

Yellow Temperature Differential Differential Differential Differential

Signal Input -H Input -H Input -H Input -H

Blue Relative Humidity Differential Differential Differential Differential

Signal Input -H Input -H Input -H Input -H

Purple Signal Reference Differential

Input - L

Differential

Input - L

Differential

Input - L

Differential

Input - L

Black Power Ground G

G AG

Shield Shield G

Red Power 12V 12V 12V 12V

Orange Power Control Control Port Control

Port

Control Port Control

Port

TABLE 5-2

Calibration for Relative Humidity

Units Multiplier

(% mV-1)Offset

(%)

Celsius 0.1 0

Fahrenheit 0.001 0

Model HMP45C Temperature and Relative Humidity Probe

The HMP45C output scale is 0 to 1000 millivolts for the temperature range of

-40°C to +60°C and for the relative humidity range of 0 to 100%. Tables 5-1

and 5-2 provide calibration information for temperature and relative humidity

TABLE 5-1. Calibration for Temperature

Units Multiplier

(degrees mV-1)Offset

(degrees)

Celsius 0.1 -40

Fahrenheit 0.18 -40

TABLE 5-3.

Wiring for Single-ended Measurement Examples

Color Description CR1000 CR10(X)

Yellow Temperature SE 2 (1L) SE 3 (2H)

Blue Relative Humidity SE 1 (1H) SE 4 (2L)

Purple Signal Reference

Orange Power Control C1 C1

Red Power 12V 12V

Black Power Ground

Clear Shield

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