Produkt overview
The Extech RH300 is a compact digital psychrometer designed for field applications, providing simultaneous measurements of relative humidity, air temperature, dew point, and wet bulb temperature. Its robust design includes a unique sensor cap for protection during storage.
This device is capable of calculating T1-T2 differential (air temperature minus external probe temperature) when an optional TP890 probe is used, and also T2 minus dew point. Advanced features include Data Hold, selectable Auto Power Off, and MAX/MIN/Average reading capabilities.
Figur 1: Forside view of the Extech RH300 Digital Psychrometer, showing the display and control buttons.
Sikkerhedsoplysninger
Please read and understand all safety precautions before operating the Extech RH300. Failure to follow these instructions may result in injury or damage to the device.
- Udsæt ikke enheden for ekstreme temperaturer eller direkte sollys i længere perioder.
- Undgå at tabe enheden eller udsætte den for kraftige stød.
- Forsøg ikke at skille enheden ad eller ændre den. Overlad al service til kvalificeret personale.
- Sørg for korrekt installation og bortskaffelse af batterier i henhold til lokale regler.
- Keep the sensor cap closed when the device is not in use to protect the sensor.
Opsætning
Installation af batteri
The Extech RH300 requires two AAA (1.5V) batteries for operation. Follow these steps to install the batteries:
- Find batteridækslet på bagsiden af enheden.
- Skub dækslet åbent i pilens retning.
- Insert two AAA batteries, ensuring correct polarity (+ and -) as marked inside the compartment.
- Luk batteridækslet ordentligt, indtil det klikker på plads.
Figur 2: Bagside view of the Extech RH300, showing the battery compartment and two AAA batteries.
Første gang tændt
Efter isætning af batterierne skal du trykke på ON/OFF button to power on the device. The display will illuminate and show the current humidity and temperature readings.
Betjeningsvejledning
Tager målinger
To ensure accurate readings, allow the device to stabilize in the measurement environment for a few minutes. Keep the sensor clear of obstructions.
- Relative Humidity (%RH): Displayed on the top line of the LCD.
- Lufttemperatur: Displayed on the middle line of the LCD.
- Dew Point (DP) / Wet Bulb (WB): Tryk på T/DP or T2/WB button to cycle between these readings on the bottom line of the LCD.
Unit Selection (°C/°F)
Tryk på ° C / ° F knappen for at skifte mellem temperaturenheder Celsius og Fahrenheit.
Data Hold-funktion
Tryk på HOLDE button to freeze the current readings on the display. Press HOLDE again to release and resume live measurements.
MAX/MIN/Average Readings
The RH300 can record maximum, minimum, and average readings. To access these functions:
- Tryk på RESET MN/MX knappen én gang for at vise de maksimalt registrerede værdier.
- Press it again to display the minimum recorded values.
- Press it a third time to display the average recorded values.
- To clear the recorded MAX/MIN/Average values, press and hold the RESET MN/MX button until the display resets.
Automatisk sluk
The device features a selectable Auto Power Off function to conserve battery life. Refer to the full manual for details on enabling or disabling this feature.
Opretholdelse
Rensning
Tør enheden af med en blød, damp cloth. Do not use abrasive cleaners or solvents. Ensure the sensor area remains clean and free of dust or debris.
Opbevaring
When not in use, store the RH300 in a cool, dry place. Always close the sensor cap to protect the humidity sensor from damage and contamination. Remove batteries if storing for extended periods to prevent leakage.
Kalibrering
The Extech RH300 is factory calibrated. For professional applications requiring periodic recalibration, contact Extech customer support or an authorized service center. Calibration kits (e.g., RH305) may be available for user calibration at specific humidity levels.
Fejlfinding
| Problem | Mulig årsag | Løsning |
|---|---|---|
| Enheden tænder ikke. | Døde eller forkert installerede batterier. | Udskift batterierne, og sørg for korrekt polaritet. |
| Upræcise aflæsninger. | Sensor obstructed or contaminated; device not stabilized; extreme environmental conditions. | Clean sensor; allow device to acclimate to environment; avoid direct breath on sensor. |
| Display shows "OL" or "---". | Measurement range exceeded or sensor error. | Move to an environment within the specified operating range. If issue persists, contact support. |
Specifikationer
| Parameter | Værdi |
|---|---|
| Model | RH300 |
| Relativ luftfugtighedsområde | 10 til 90 % RF |
| Lufttemperaturområde | -4 til 122°F (-20 til 50°C) |
| Dugpunktsområde | -90.4 til 122°F (-68.0 til 49.9°C) |
| Wet Bulb Range | -6.9 til 122°F (-21.6 til 49.9°C) |
| Strømforsyning | 2 x AAA (1.5V) batteries |
| Dimensioner | 3.1 x 1.9 x 9 tommer (7.9 x 4.8 x 22.9 cm) |
| Vægt | 0.704 ounce (0.02 kg) |
| Oprindelsesland | Kina |
Figure 3: Extech RH300 with approximate dimensions indicated.
Garantioplysninger
The Extech RH300 Digital Psychrometer comes with a 1 års begrænset garanti from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage resulting from misuse, abuse, accident, unauthorized alteration or repair, or acts of nature.
For warranty service, please retain your proof of purchase and contact Extech customer support.
Kundesupport
For technical assistance, troubleshooting, or service inquiries, please visit the official Extech webwebsted eller kontakt deres kundesupportteam.
- Extech Webwebsted: www.extech.com
- Online support: Refer to the support section on the Extech website for FAQs, downloads, and contact forms.
