Campbell HMP45C Podręcznik Użytkownika Pobierz pdf (Strona 23)

User Guide

;Turn the HMP45C off.

;

05: Do (P86)

1: 51 Set Port 1 Low

;Compute the saturation vapour pressure.

;The temperature must be in degrees Celsius.

;

06: Saturation Vapour Pressure (P56)

1: 1 Temperature Loc [ T_C ]

2: 3 Loc [ e_sat ]

;Compute the vapour pressure.

;Relative humidity must be a fraction.

;

07: Z=X*Y (P36)

1: 3 X Loc [ e_sat ]

2: 2 Y Loc [ RH_frac ]

3: 4 Z Loc [ e ]

8. Maintenance

The HMP45C Probe requires minimal maintenance. Check monthly to make

sure the radiation shield is free from debris. The black screen at the end of the

sensor should also be checked for contaminates.

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 9 lists the maximum ambient concentrations, of some chemicals, that

the HUMICAP

can be exposed to.

Table 9. Chemical Tolerances of HMP45C

Chemical Concentration (PPM)

Organic solvents 1000 to 10,000

Aggressive chemicals

(e.g. SO

, H

HCl, Cl

, etc.)

1 to 10

Weak Acids 100 to 1000

Bases 10,000 to 100,000

Recalibrate the HMP45C annually. Obtain a returns number before returning

the HMP45C to Campbell Scientific for recalibration.

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