Extech Instruments RH300 User manual

User's Guide

Digital Psychrometer

Models RH300 and RH305 (kit)

Introduction

Congratulations on your purchase of the Extech RH300 Digital Psychrometer. This device

measures Humidity, Air Temperature, Dew Point temperature and Wet Bulb temperature.

Advanced features include External Temperature Measurement (with optional probe), Data

Hold, selectable Auto Power Off, and MAX/MIN/Average reading. Careful use of this meter

will provide years of reliable service.

HOLD

RESET

MX/MN

RESET

MX/MN

T/DP

/WB

ON/OFF

C/ F

RH300 V1.4 11/04

Specifications

Function Range and Resolution Accuracy

Humidity 0.0 to 100.0% RH ±3% RH (10 to 90%) @ 23oC

Temperature (internal) -4.0 to 122.0oF (-20 to 50oC) ±1.8oF (±1oC)

Temperature (external) -4.0 to 158.0oF (-20 to 70oC) ±1.8oF (±1oC)

Display Triple LCD

Sensor Type Humidity: Precision capacitance sensor

Temperature: Thermistor

Response Time 60 seconds typical

Dew Point -90.4 to 122.0oF (-68 to 50oC) (calculated from RH and Air

temperature measurements)

Wet Bulb -6.88 to 122.0oF (-21.6 to 50oC) (calculated from RH and Air

temperature measurements)

Operating Conditions -4 to 122oF (-20 to 50oC); < 99% RH non-condensing

Storage Conditions -40 to 185oF (-40 to 85oC); <99% RH non-condensing

Power Supply 2 x 1.5V ‘AAA’ batteries

Battery Life Approx. 80 hours

Dimensions / Weight 7 x 1.9 x 1” (178.5 x 48.8 x 25.2mm); 4.9 oz. (140g)

Meter Description

1. Humidity Sensor & Air Temperature Sensor

2. Triple LCD Display

3. ON/OFF button

4. T1-T2/Dew Point/T1 button

5. °F/°C select

6. MIN/MAX/RESET button

7. T2-DP/Wet Bulb/T2 button

8. HOLD button

9. T2 Probe Jack

Note: The battery compartment is located

on the rear of the instrument

HOLD

RESET

MX/MN

T/DP

/WB

ON/OFF

C/ F

RH300 V1.4 11/04

/WB

T/DP

Display Description

1. Relative Humidity %

2. T1

3. T1-T2

4. Dew Point

5. Wet Bulb

6. T2-Dew Point

7. °C/°F

8. T2

9. Maximum

10. Minimum

11. Low Battery/Hold

Operation

Open the Protective Sensor Cap

Twist the protective sensor cap, located at the top of

the meter, counter-clockwise a quarter of a turn to

expose the sensor

Plug in the optional external temperature probe (if

needed).

Turn Power ON or OFF

Press the ON/OFF button to turn power on or off. The meter will perform a short self-test

when turned on.

Taking measurements

1. Hold the probe in the area to be tested.

2. Allow adequate time for readings to stabilize.

3. The Relative Humidity measurement appears in

the top display.

4. Pressing the button toggles the lower left

display between T1-T2 (internal temperature-

external temperature), DP (Dew Point), and T1

(internal temperature).

5. Pressing the button toggles the lower right

display between T2-DP (external temperature-

Dew Point), WB (Wet Bulb), and T2 (external

temperature).

Note: If the external probe is not connected, T1-T2, T2-DP, and T2 measurements will not

be displayed.

Selecting temperature units of measure (C/F)

Press and hold the oC/oF button momentarily to toggle the temperature units.

CLOSE OPEN

RH300 V1.4 11/04

RESET

MX/MN

RESET

MX/MN

RESET

MX/MN

RESET

MX/MN

/WB

T/DP

Wet Bulb and Dew Point measurements

1. To read the Wet Bulb measurement, press the button until the symbol Wb

appears in the lower right display. Note: T2 will not be displayed unless the external

probe is connected.

2. Wet Bulb temperature is now displayed.

3. To read the Dew Point measurement, press the button until the symbol DP

appears in the lower left display .

4. Dew Point temperature is now displayed.

Minimum (MIN) Maximum (MAX) Function

The MIN/MAX mode allows the user to view only the lowest (MIN) or highest (MAX)

readings. Press the button once and MIN appears on the display. The display is

now showing the lowest humidity and temperature reading in memory. Press the

button again and MAX appears on the display. The display is now showing the maximum

humidity and temperature readings in memory. To exit the MIN/MAX mode, press the

button again and the MIN and MAX icons disappear. To clear the current min/max

readings in memory, press and hold the button for more than two seconds.

Data Hold

Press the HOLD button momentarily to freeze the displayed reading. The 'HLD' icon will

appear on the upper right-hand side of the display. Press the HOLD button again to return

to normal operation.

Automatic Power OFF

The meter automatically shuts off after a programmed period of time. The default time is 10

minutes. To program the time period, press down the HOLD button while turning the meter

on. Continue to hold down both buttons and the meter will cycle through the selectable

power-off times: n, 2, 5, 10, 20, 40 or 60 minutes. “n” disables the auto power off function.

When the desired power-off time appears in the display, release both buttons to select the

time and return to normal operation.

Error Messages

An error message will appear on the display if the meter fails an internal diagnostic test.

1. ER1: Relative Humidity failure. Repair/replacement is necessary.

2. ER2: Internal temperature failure. Repair/replacement necessary.

3. ER3: Reference resistance failure. Repair/replacement necessary.

4. ER4: Internal temperature is out of range.

5. ER5: External temperature is out of range.

RH300 V1.4 11/04

RESET

MX/MN

RESET

MX/MN

CALIBRATION

The following verification and calibration procedures require the 33% and 75% RH reference

bottles which are supplied with the Model RH305 kit.

Accuracy Verification

Checking the 33% or 75% RH Calibration

1. Insert meter’s sensor into the 33% or 75% salt reference bottle

2. Check the reading after 10 minutes

3. Verify that the reading is within the accuracy specification

Relative Humidity Calibration (33% and 75%)

33% Calibration

1. Ensure that “DP” and “WB” appear in the bottom displays before turning the meter

OFF.

2. Insert the meter sensor into the 33% salt reference bottle.

3. Allow the meter one hour to stabilize.

4. While holding down the °C/°F button, press and hold the ON/OFF button for 2 seconds

to enter calibration mode.

5. “32.8%” will flash on the LCD screen and “DP” and “WB” will display “_ _ _ _”. After 30

minutes, the flashing will stop to indicate that the 33% calibration is complete. Note: To

exit from the calibration procedure before completion, pressing the ON/OFF button will

turn the meter off.

6. Proceed to the 75% Calibration below.

75% Calibration

1. Insert the meter sensor into the 75% salt reference bottle.

2. Allow the meter one hour to stabilize.

3. Press and hold the button for 2 seconds to enter the 75% calibration.

4. “75.3%” will flash on the LCD. After 30 minutes, the flashing will stop to indicate that

the 75% calibration is complete.

5. Turn power off. Calibration is now complete.

Note: If the salt at the bottom of the calibration bottles appears dry, the bottles should be

replaced.

RH300 V1.4 11/04



Support line (781) 890-7440

Technical support: Extension 200; E-mail: [email protected]m

Repair & Returns: Extension 210; E-mail: [email protected]

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Maintenance

Cleaning and storage

1. The meter should be cleaned with a damp cloth and mild detergent when necessary.

Do not use solvents or abrasives.

2. Store the meter in an area with moderate temperature and humidity (refer to the

operating and storage range in the specifications chart earlier in this manual).

Battery Replacement

When the battery power falls low, the symbol will appear on the LCD. Replace the two

(2) 1.5 ‘AAA’ batteries by removing the rear battery compartment cover and accessing the

battery compartment. Observe polarity when placing the batteries in the compartment.

Ensure that the compartment cover is securely fastened when finished.

Warranty

EXTECH INSTRUMENTS CORPORATION warrants the basic instrument to be free of

defects in parts and workmanship for one year from date of shipment (a six month limited

warranty applies on sensors and cables). If it should become necessary to return the

instrument for service during or beyond the warranty period, contact the Customer Service

Department at (781) 890-7440 EXTENSION 210 for authorization or visit www.extech.com for

more information. A Return Authorization (RA) number must be issued before any

product is returned to Extech. The sender is responsible for shipping charges, freight,

insurance and proper packaging to prevent damage in transit. This warranty does not apply

to defects resulting from action of the user such as misuse, improper wiring, operation

outside of specification, improper maintenance or repair, or unauthorized modification. Extech

specifically disclaims any implied warranties or merchantability or fitness for a specific

purpose and will not be liable for any direct, indirect, incidental or consequential damages.

Extech's total liability is limited to repair or replacement of the product. The warranty set forth

above is inclusive and no other warranty, whether written or oral, is expressed or implied.

Manual del usuario

Sicrómetro Digital

Modelo RH300 y RH305 (kit)

Introducción

Felicitaciones por su compra del Sicrómetro digital RH300 de Extech Este dispositivo mide

humedad, temperatura del aire, temperatura de punto de rocío y temperatura de

termómetro de bulbo húmedo . Las características avanzadas incluyen medición de

temperatura exterior (con sonda opcional), retención de datos, apagado automático

optativo y lecturas MÁX / MIN/Promedio. El uso cuidadoso de este medidor le proveerá

muchos años de servicio confiable.

HOLD

RESET

MX/MN

RESET

MX/MN

T/DP

/WB

ON/OFF

C/ F

RH300 V1.4 11/04

Especificaciones

Función Escala y Resolución Precisión

Humedad 0.0 a 100.0% RH ±3% RH (10 a 90%) @ 23oC

Temperatura (interior) -20.0 a 50oC (-4 a 122.0oF) ±1oC (±1.8oF)

Temperatura (exterior) -20 a 70oC (-4.0 a 158.0oF) ±1oC (±1.8oF)

Pantalla LCD triple

Sensor tipo Humedad: Sensor de precisión para capacitancia

Temperatura: Termistor

Punto de rocío -68 a 50oC (-90.4 a 122.0oF)

Bulbo húmedo -21.6 a 50oC (-6.88 a 122.0oF)

Tiempo de respuesta 60 segundos típicamente

Condiciones de operación -20 a 50oC (-4 a 122oF); < 99% RH sin

condensación

Condiciones de almacenamiento -40 a 85oC (-40 a 185oF); <99% RH sin

condensación

Fuente de tensión 2 X 1.5V 'AAA’ baterías

Vida de la batería Aprox. 80 horas

Dimensiones / Peso 178.5 X 48.8 X 25.2mm(7 X 1.9 X 1”); 140 g. (4.9 oz)

Descripción del medidor

1. El sensor de la humedad y el sensor aéreo de la

temperatura

2. El despliegue triple de LCD

3. Botón ON/OFF

4. Botón T1-T2/Punto de rocío/T1

5. °F/°C. selector

6. Botón MIN/MÁX/RESTAURAR

7. T2-PR/bulbo húmedo/T2 (PR = Punto de rocío)

8. Botón Retención (HOLD)

9. T2 Teiete la entrada

Nota: El compartimiento de la batería se localiza atrás del

instrumento

HOLD

RESET

MX/MN

T/DP

/WB

ON/OFF

C/ F

RH300 V1.4 11/04

/WB

T/DP

Descripción del despliegue

1. Humedad relativa %

2. T1

3. T1-T2

4. Punto de rocío

5. Bulbo húmedo

6. T2- Punto de rocío

7. °C/°F

8. T2

9. Máximo

10. Mínimo

11. La batería baja /Retención

Operación

Abra la cubierta protectora del sensor

En la parte superior del medidor gire la cubierta

protectora del sensor un cuarto de vuelta contra reloj

para exponer el sensor.

Enchufe la sonda optativa para temperatura exterior (si

necesitado).

Encienda (ON) o apague (OFF),

Presione el botón ON/OFF para encender o apagar. El medidor realizará una corta prueba

interna al encender.

Toma de medidas

1. Sostenga la sonda en el área que desea probar

2. De suficiente tiempo para que la lectura se

estabilice.

3. La medida de humedad relativa se muestra en la

pantalla superior.

4. Al presionar el botón cambia la indicación

inferior izquierda entre T1-T2 (temperatura

interior/exterior), PR (punto de rocío) y T1

(temperatura interna)

5. Al presionar el botón cambia la indicación

inferior derecha entre T2-PR (temperatura exterior/punto de rocío), WB (bulbo

húmedo), y T2 (temperatura exterior)

Nota: Si no está conectada la sonda externa, no se mostrarán las medidas T1-T2, T2-PR

y T2.

Selección de unidades de medición de temperatura (C./°F)

Presione y sostenga momentáneamente el botón oC/oF para cambiar las unidades de

temperatura.

ABRA

CIERRE

RH300 V1.4 11/04

RESET

MX/MN

RESET

MX/MN

RESET

MX/MN

RESET

MX/MN

/WB

T/DP

Medidas de Bulbo húmedo y Punto de rocío

1. Para leer la medida de bulbo húmedo, presione el botón hasta que en la

pantalla inferior derecha aparezca el símbolo Wb. T2 no se demostrará a menos que

la tienta externa se conectará.

2. Se muestra la temperatura de bulbo húmedo.

3. Para leer la medida de Punto de rocío, presione el botón hasta que en la

pantalla inferior derecha aparezca el símbolo DP.

4. Se muestra la temperatura de Punto de rocío.

Función Mínimo (MIN) Máximo (MÁX)

El modo MIN/MÁX permite al usuario ver sólo las lecturas más baja MIN:) o más alta

MÁX). Presione una vez el botón . y MIN: aparece en la pantalla. La pantalla indica

ahora las lecturas de humedad y temperatura más bajas en la memoria. Presione de

nuevo el botón . y MÁX aparece en la pantalla. La pantalla indica ahora las lecturas

más altas de humedad y temperatura en la memoria. Para salir del modo MIN/MÁX,

presione de nuevo el botón y desaparecen los iconos MIN: y MÁX. Para borrar

las lecturas min./máx. de la memoria, presione y sostenga el botón durante más de

dos segundos.

Retención de datos

Presione el botón HOLD para congelar la lectura indicada. El icono 'HLD' aparece en la

parte superior derecha de la pantalla. Presione HOLD de nuevo para regresar a operación

normal.

Apagado automático

El medidor se apaga automáticamente después de un periodo programado. El tiempo

predeterminado es de 10 minutos. Para programar el tiempo de espera, presione el botón

Retención (HOLD) al encender el medidor. Continúe presionando ambos botones y el

medidor pasará por los tiempos disponibles para apagado: n, 2, 5, 10, 20, 40 ó 60

minutos. "n" desactiva la función de apagado automático. Cuando el tiempo de apagado

deseado aparezca en la pantalla, suelte ambos botones para seleccionar el tiempo y

regresar a operación normal.

Mensajes de error

Aparecerá un mensaje de error en pantalla si el medidor falla la prueba interna de

diagnóstico.

1. ER1: Falla de humedad relativa Es necesario reparar o reemplazar.

2. ER2: Falla de temperatura interior. Es necesario reparar o

reemplazar.

3. ER3: Falla de la resistencia de referencia . Es necesario reparar o

reemplazar.

4. ER4: La temperatura interior está fuera de escala.

5. ER5: La temperatura externa está fuera de escala.

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