RH490 [EXTECH]

Precision Hygro-Thermometer; 精密温湿度计
RH490
型号: RH490
厂家: EXTECH INSTRUMENTS CORPORATION.    EXTECH INSTRUMENTS CORPORATION.
描述:

Precision Hygro-Thermometer
精密温湿度计

文件: 总7页 (文件大小:112K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
User's Guide  
Precision Hygro-Thermometer  
Model RH490  
Introduction  
Congratulations on your purchase of the Extech RH490 Precision Hygro-  
Thermometer. This device measures Humidity, Air Temperature, Dew Point  
temperature, Wet Bulb temperature and Grains of Water Vapor Per Pound of Air.  
Advanced features include Data Hold, Auto Power Off, and MAX/MIN reading. This  
meter is shipped fully tested and calibrated and with proper use will provide years  
of reliable service.  
Warranty  
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free  
of defects in parts and workmanship for one year from date of shipment (a six  
month limited warranty applies to 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 ext. 210 for  
authorization or visit our website www.extech.com for contact 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.  
Copyright © 2006 Extech Instruments Corporation  
All rights reserved including the right of reproduction in whole or in part in any form.  
2
RH490 V2.0 12/06  
Meter Description  
1. Humidity & Temperature Sensor  
2. LCD Display  
3. Power ON/OFF button  
4. °F/°C/WBT (wet bulb)/Dew Point button  
5. Hold/MIN-MAX button  
6. %RH, GPP, g/Kg, Backlight button  
Note: The battery compartment is located  
on the rear of the instrument  
Display Description  
1. Relative Humidity %  
2. Dew Point  
3. Wet Bulb  
4. °C/°F  
5. Temp/WB/DP Display  
6. Maximum  
7. Minimum  
8. Low Battery  
9. Hold  
10. RH% Display  
11. Auto Off  
12. Grains per pound  
3
RH490 V2.0 12/06  
Operation  
Power  
Press the power button “ “ to turn power on or off.  
%RH  
1. To select %RH measurement, press the  
%RH/GPP/g/Kg” button.  
2. Hold the probe in the area to be tested.  
3. Allow adequate time for readings to stabilize.  
4. The Relative Humidity measurement appears in the  
top display.  
5. Pressing the “°F/°C/WBT/Dew Point” button  
toggles the lower display between Temperature  
(°F), Temperature (°C), Dew Point (°C), Dew Point  
(°F), Wet Bulb (°C) and Wet Bulb (°F).  
Mixing Ratio (Grains Per Pound or Grams Per Kilograms)  
1. To select GPP or g/kg measurement, press the  
%RH/GPP/g/Kg” button.  
2. Hold the probe in the area to be tested.  
3. Allow adequate time for readings to stabilize.  
4. The GPP or g/Kg measurement appears in the top  
display.  
5. Pressing the “°F/°C/WBT/Dew Point” button  
toggles the lower display between Temperature  
(°F), Temperature (°C), Dew Point (°C), Dew Point  
(°F), Wet Bulb (°C) and Wet Bulb (°F).  
4
RH490 V2.0 12/06  
Dew Point  
1. To select the Dew Point measurement, press the  
°F/°C/WBT/Dew Point” button until DEWPOINT  
(°F or °C) appears in the lower right.  
2. Dew Point temperature is now displayed.  
Wet Bulb  
1. To select the Wet Bulb measurement, press the  
°F/°C/WBT/Dew Point” button until WET BULB  
(°F or °C) appears in the lower right.  
2. Wet Bulb temperature is now displayed.  
Temperature  
1. To select the temperature measurement, press the  
°F/°C/WBT/Dew Point” button until “°C” or “°F”  
appears in the lower right.  
2. Temperature is now displayed.  
Data Hold  
1. Press the ”H MAX MIN” button momentarily to  
freeze the displayed readings. ”HOLD” will appear  
on the upper left-hand side of the display.  
2. Press the ”H MAX MIN” button three more times to  
return to normal operation. (Steps through MAX  
and MIN)  
5
RH490 V2.0 12/06  
Minimum (MIN) Maximum (MAX) Function  
The MIN/MAX mode allows the user to view only the lowest (MIN) or highest  
(MAX) readings.  
1. Press the ”H MAX MIN” button twice and “MIN” appears on the display. The  
LCD is now displaying the minimum value recorded in both the top and  
bottom display. The display will not change until a lower reading is  
registered.  
2. Press the ”H MAX MIN” button again and “MAX”  
appears on the display. The LCD is now displaying  
the maximum value recorded in both the top and  
bottom display. The display will not change until a  
higher reading is registered.  
3. To exit the MIN/MAX mode, press the ”H MAX  
MIN” button again. The “MAX” icon will disappear.  
Note: Max and Min values are recorded into memory  
while the meter is on. The values are erased  
when power is turned off.  
Backlight  
Press and hold the light button “ “ until the backlight turns on. To turn the  
backlight off, press and hold the light button “ “ until the backlight turns off.  
Automatic Power OFF  
The meter has a default setting that automatically shuts the meter off after 10  
minutes (indicated by the  
symbol on the display).  
This battery saving feature can be disabled.  
To disable the auto power off function, press and hold the ”H MAX MIN” hold  
button while powering on. The  
has been disabled.  
symbol will not appear when auto power off  
The meter will revert to the default auto-off mode when powered off.  
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 becomes weak the “  
“ battery symbol will appear on the  
LCD. Replace the 9 Volt battery by removing the Philips head screw holding the  
rear battery compartment cover to access the battery compartment. Ensure that  
the compartment cover is securely fastened when finished.  
6
RH490 V2.0 12/06  
Specifications  
Function  
Humidity  
Range and Resolution  
0.0 to 10.0%RH  
Accuracy  
±3%RH  
±2%RH  
±3%RH  
10.0 to 90.0%RH  
90.0 to 100.0%RH  
Temperature  
-22.0 to – 3.9oF  
-30.0 to -19.9oC  
±2.7oF  
±1.5oC  
-4.0 to 158.0oF  
±1.8oF  
±1oC  
-20.0 to 70.0oC  
158.1 to 199.0oF  
70.1 to 100.0oC  
±2.7oF  
±1.5oC  
Wet Bulb  
32 to 176°F (0 to 80°C)  
Dew Point  
-22 to 199°F (-30 to 100°C)  
Calculated from RH and air  
temperature measurements  
0 to 1120 GPP (grains per pound)  
0 to 160 g/kg (grams per kilogram)  
Dual LCD  
Mixing Ratio  
Display  
Response Time:  
<30 seconds (90% of final value in moving air)  
Operating Conditions 32 to 122oF (0 to 50oC); < 80% RH non-condensing  
Storage Conditions -40 to 185oF (-40 to 85oC); <99% RH non-condensing  
Power Supply  
Battery Life  
9 Volt battery  
Approx. 24 hours  
Dimensions / Weight 7.8 x 1.7 x 1.3” (200 x 45 x 33mm); 7 oz. (200g)  
Calibration and Repair Services  
Extech offers repair and calibration services for the products we sell. Extech  
also provides NIST certification for most products. Call the Customer Service  
Department for information on calibration services available for this product.  
Extech recommends that annual calibrations be performed to verify meter  
performance and accuracy.  
Support line (781) 890-7440  
Technical support: Extension 200; E-mail: support@extech.com  
Repair & Returns: Extension 210; E-mail: repair@extech.com  
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  
7
RH490 V2.0 12/06  

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