Campbell HMP45C212 Manual de usuario

MODEL HMP45C212 TEMPERATURE

AND RELATIVE HUMIDITY PROBE

INSTRUCTION MANUAL

PRELIMINARY: 31/03/00

WARRANTY AND ASSISTANCE

The HMP45C212 TEMPERATURE AND RELATIVE HUMIDITY PROBE is warranted by

CAMPBELL SCIENTIFIC (CANADA) CORP. (“CSC”) 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. CSC's obligation under this warranty is limited to

repairing or replacing (at CSC's option) defective products. The customer shall assume all

costs of removing, reinstalling, and shipping defective products to CSC. CSC will return

such products by surface carrier prepaid. This warranty shall not apply to any CSC

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. CSC is not liable

for special, indirect, incidental, or consequential damages.

Products may not be returned without prior authorization. To obtain a Return Merchandise

Authorization (RMA), contact CAMPBELL SCIENTIFIC (CANADA) CORP., at (780) 454-

2505. An RMA number will be issued in order to facilitate Repair Personnel in identifying

an instrument upon arrival. Please write this number clearly on the outside of the shipping

container. Include description of symptoms and all pertinent details.

CAMPBELL SCIENTIFIC (CANADA) CORP. does not accept collect calls.

Non-warranty products returned for repair should be accompanied by a purchase order to

cover repair costs.

MODEL HMP45C212

TEMPERATURE AND RELATIVE HUMIDITY PROBE

1. GENERAL

The Model HMP45C212 probe contains a Vaisala

capacitive relative humidity sensor and a YSI

44212 thermistor as per attached documentation in

Appendix A. The probe is designed to be housed

in the 41002-2 12 Plate Gill Radiation Shield, or

equivalent; a ten foot lead length is standard.

Longer lead lengths are available up to 1000 feet.

Voltage drop in the longer lead lengths will lower

the RH reading by approximately 0.6% RH per 100

feet of cable. Do not extend lead lengths by adding

wire to the pigtail (connection) end or measurement

errors will result.

2. ACCURACY – TEMPERATURE SENSOR

Refer to Appendix A for details regarding the YSI

44212 thermistor.

3. RH SENSOR – SPECIFICATIONS

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

Supply Voltage (via CSI switching circuit):

7 to 35 VDC

Settling Time: 0.15 seconds

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

4. INSTALLATION

The HMP45C212 must be housed inside a radiation

shield when used in the field. The 41002 Radiation

Shield (Figure 1) mounts to a CM6/CM10 tripod or UT10

tower. The UT018 mounting arm and UT12VA Radiation

Shield mount to a UT30 tower (Figure 2).

A lead length of 6 feet allows the HMP45C212 to be

mounted at a 2 meter height on a CM6/CM10 tripod.

Use a lead length of 9 feet for the UT10 tower or a UT30

tower respectively.

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.

NOTE: Do not connect the power control lead and

the temperature excitation to the same excitation

channel. The power control will slow the response of

the excitation and result in temperature errors.

FIGURE 1. HMP45C212 and 41002 Radiation Shield on a CM6/CM10 Tripod Mast or UT10 Tower leg

FIGURE 2. HMP45C212 with UT018 Mounting Bracket and Crossarm and

UT12VA Radiation Shield Mounted on a UT30 Tower

Red (+12V) Datalogger +12V

Yellow (Power Control) Control Port

Purple (RH Power GND) Ground (G or )

Clear (Shield GND) Ground (G or )

Green (RH Signal) Single Ended Input

Black (Temp. Excitation) Switched Excitation

Orange (Temp. Signal) Single Ended Input

White (Temp. GND) Analog Ground ( AG or )

FIGURE 3. HMP45C212 Probe Datalogger Connection

HMP45C212 TEMPERATURE AND RH PROBE

TABLE 1. Datalogger Connections for Single-Ended Measurements

Description Colour CR10(X), CR500 CR23X 21X, CR7

Temperature Orange Single-Ended Input Single-Ended Input Single-Ended Input

Relative Humidity Green Single-Ended Input Single-Ended Input Single-Ended Input

Temperature Signal

Reference

White

Power Control Yellow Control Port Control Port Control Port

Power Red 12 V 12 V 12 V

Power Ground Purple AG

Shield Clear G

Temperature Excitation Black Switched Excitation Switched Excitation Switched Excitation

5. WIRING

Connections to the datalogger for the HMP45C212

are shown in Figure 3 and Table 1. The probe

requires two single ended analog measurements,

the green (RH) and the orange (temp.) leads can

be inserted into either HI or LO inputs.

The black thermistor excitation lead connects to

any excitation channel. The yellow lead is used to

control switching 12 volts to the relative humidity

sensor and is connected to a control port. The

number of HMP45C212 probes per excitation

channel is physically limited by the number of lead

wires that can be inserted into a single excitation

terminal (approximately 10).

The white lead connects to Analog ground.

Analog ground, labelled “AG” on the CR10X, is the

same as Ground (G) for the 21X and CR7. The

clear lead is the shield which connects to Ground

(G) on the datalogger.

6. PROGRAMMING

Program Instruction 4 is used to measure the

temperature.

Program Instruction 4 sets an excitation voltage to

the thermistor bridge then makes a single ended

voltage measurement. The thermistor portion of

the probe has a linear millivolt output over the –50

to +50 Celsius range. A multiplier of 0.07154 and

an offset of –72.789 provides output of

temperature in Celsius.

The HMP45C212 output scale is 0 to 1000

millivolts for the relative humidity range of 0 to

100%. On the RH measurement, use a multiplier

of 0.1 for percent and a multiplier of 0.001 for

fraction output. The RH measurement does not

require an offset.

Example 1. Sample CR10(X) Program Using Single-Ended Measurement Instructions

;Measure the HMP45C212 temperature.

;

01: P 4 Excite, Delay, Volt (SE)

1: 1 Rep

2: 5 2500 mV Slow Range ; CR510 (2500mV); CR23X, 21X, CR7 (5000mV)

3: 3 IN Chan ; Orange Wire (SE3)

4: 1 EX Chan

5: 0 Delay

6: 2500 mV Excitation

7: 1 Loc [Air Temp.]

8: .07154 Mult ; Degrees Celsius

9: -72.789 Offset ; Degrees Celsius

;Turn the HMP45C212 RH circuitry on.

;

02: Do (P86)

1: 41 Set Port 1 High ; Yellow wire (C1)

;Pause 150 mSec, before making measurements, so the

;probe can stabilize on true readings.

;

03: Excitation with Delay (P22)

1: 1 Ex Channel

2: 0 Delay W/Ex (units = 0.01 sec)

3: 15 Delay After Ex (units = 0.01 sec)

4: 0 mV Excitation

;Measure the HMP45C212 relative humidity.

;

04: Volt (SE) (P1)

1: 1 Reps

2: 5 2500 mV Slow Range ; CR500 (2500 mV); CR23X (1000 mV); 21X, CR7 (5000 mV)

3: 4 SE Channel ; Green wire (SE 4)

4: 2 Loc [ RH_pct ]

5: .1 Mult ; mult 0.1 for percent RH, mult 0.001 for fraction

6: 0 Offset

;Turn the HMP45C212 off.

;

05: Do (P86)

1: 51 Set Port 1 Low ; Yellow wire (C1)

7. MAINTENANCE

The HMP45C212 Probe requires minimal maintenance.

Check monthly to make sure the radiation shield is free

from debris. The black screen on the sensor’s end

should also be checked.

When installed in close proximity to the ocean or other

bodies of salt water (e.g., Great Salt Lake), a coating of

salt (mostly NaCl) may build up on the radiation shield,

sensor, filter and even the chip. NaCl has an affinity for

water. The humidity over a saturated NaCl solution is

75%. A buildup of salt on the filter or chip will delay or

destroy the response to atmospheric humidity.

The filter can be rinsed gently in distilled water. If

necessary, the chip can be removed and rinsed as well.

Do not scratch the chip while cleaning.

Long term exposure of the HUMICAP® relative humidity

sensor to certain chemicals and gases may affect the

characteristics of the sensor and shorten its life. Table 2

lists the maximum ambient concentrations, of some

chemicals, that the HUMICAP® can be exposed to.

Detailed information on allowed concentrations can be

requested from Campbell Scientific representatives.

Table 2. Chemical Tolerances of HMP45C212

Chemical Concentration (PPM)

Organic solvents 1,000 to 10,000

Aggressive Chemicals

(e.g. SO2, H2SO4,

H2S, HCL, CL2, etc.)

1 to 10

Weak Acids 100 to 1,000

Bases 10,000 to 100,000

Recalibrate the HMP45C212 annually. Obtain an

RMA number before returning the HMP45C212 to

Campbell Scientific for recalibration.

8. REFERENCES

Goff, J.A. and S. Gratch, 1946: Low-pressure

properties of water from -160° to 212°F, Trans.

Amer. Soc. Heat. Vent. Eng., 51, 126-164.

Lowe, P.R., 1977: An approximating polynomial

for the computation of saturation vapour

pressure, J. Appl. Meteor., 16, 100-103.

Weiss, A., 1977: Algorithms for the calculation of

moist air properties on a hand calculator, Amer.

Soc. Ag. Eng., 20, 1133-1136.

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