Fieldpiece ARH4 - Digital Psychrometer Accessory Head Manuel d'utilisateur télécharger pdf

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ARH4

v27

Introduction

The Fieldpiece model ARH4 measures both

relative humidity and ambient air temperature.

The ARH4 also calculates dew point and wet bulb

temperatures.

The head converts RH%, ambient temperature,

dew point temperature, and wet bulb temperature

to a voltage at a rate of 1 RH% or degree to

1mVDC. Set the meter to mVDC to display RH% or

temperature directly.

The ARH4 snaps directly onto the Fieldpiece

HS series DMM. For other meters, use Fieldpiece

ADLS2 test leads or AHDL1 handle adapter.

To get an accurate reading, allow enough time

for the sensors to come to equilibrium. The bigger

the change, the longer the time the ARH4 may need

to calibrate to ambient conditions. Usually not more

than a couple minutes for even large changes.

Auto off

The accessory head turns off automatically after

approximately 10 minutes to lengthen battery life. To

disable "Auto off" function, remove rubber cover on

front and slide switch to right.

Temperature

Sensor: thermister temperature sensor

Range: -4°F to 140°F (-20°C to 60°C)

Resolution: 0.1°C / 0.1°F

Accuracy:

±1°F 32°F to 113°F

±2°F -4°F to 32°F,

113°F to 140°F

±0.5°C 0°C to 45°C

±1°C -20°C to 0°C,

45°C to 60°C

Output: 1mV/°C,1mv/°F

Relative Humidity

Sensor: Capacitive humidity sensor

Range: 0% to 100%RH

Accuracy:

±2.5%@77°F(25°C), 10% to 90% RH

±5%@77°F(25°C), <10%RH, >90%RH

Output: 1mV/%RH

Sensor response time: 60 seconds typical for 90%

of total range

Sensor hysteresis (excursion of 10% to 90% to 10%

RH): ±1%RH typical

Features:

1. Measures Temp and RH%

2. Calculates wet bulb and dew point

temperatures

Dew point and wet bulb

The "dew point" is the temperature at which water

vapor condenses forming fog or dew. Wet bulb is the

temperature measured after cooling by evaporation

of water. If you know temperature and relative

humidity, dew point and wet bulb temperatures can

be calculated.

The ARH4 measures relative humidity and

ambient temperature. The ARH4 calculates wet bulb

and dew point temperatures. The chart on the back

of the accessory head can be used to estimate wet

bulb temperature if you know RH% and ambient

temperature (dry bulb).

Warranty

The ARH4 is warranted to the original purchaser

against defects in material or workmanship for a

period of one (1) year from the date of purchase.

During the warranty period, Fieldpiece Instruments

will, at its option, replace or repair the defective unit.

This warranty does not apply to defects resulting

from abuse, neglect, accident, unauthorized repair,

alteration, or unreasonable use of the instrument.

Any implied warranty arising out of the sale of

Fieldpiece's products including but not limited to

implied warranties of merchantability, and tness

for purpose, are limited to the above. Fieldpiece

shall not be liable for incidental or consequential

damages.

State laws vary, so the above limitations or

exclusions may not apply to you. This warranty gives

you specic legal rights, and you may also have

other rights which vary from state to state.

Operating instructions

1. Remove cap covering sensor at the top.

2. Connect to COM and Volts jacks. To use with

any Fieldpiece “stick” meter, slide the head

over the meter. For most other meters, use the

Fieldpiece ADLS2 test leads or AHDL1 adapter

handle.

3. Select parameter on accessory head.

4. Select mVDC range on meter and read param-

eter directly on meter.

Service

Call Fieldpiece Instruments for one-price-

x-all warranty service pricing. Send check or

money order for the amount quoted. Send the

meter freight prepaid to Fieldpiece Instruments.

Send proof of date and location of purchase for

in-warranty service. The meter will be repaired or

replaced, at the option of Fieldpiece, and returned

via least cost transportation.

RELATIVE

HUMIDITY HEAD

Model ARH4

OPERATOR’S MANUAL

Specications:

Low battery indication: Red LED is lit when the

voltage drops below the operating level.

Output impedance: 500Ω approx

Operating environment: 32

F to 120

F (0

C to 50

C) at <95%RH

Storage temperature: -4

F to 140

F (-20

C to

C) <80%RH with battery removed

Accuracy: Stated accuracy at 73

F±10

(23

±5

C), <95%RH

Battery: 9V

Dimensions: 146mm(H) x 67mm(W) x 32mm(D)

Weight: approx. 180g including battery

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AUTO OFFARH4v27IntroductionThe Fieldpiece model ARH4 measures both relative humidity and ambient air temperature. The ARH4 also calculates dew point a

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Fieldpiece ARH4 - Digital Psychrometer Accessory Head Manuel d'utilisateur

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