Extech Instruments 407445 Manual de usuario

1407445es Ver. 1.04 9/99

INSTRUCTION MANUAL

Model 407445

Heavy Duty Hygro-Thermometer

•Displays Temperature & Relative Humidity

simultaneously

•High precision, capacitance RH probe

•Record / Recall MAX/MIN/AVG Readings

•PC Interface and Software

1. INTRODUCTION

Congratulations on your purchase of Extech’s Heavy Duty Hygro-Thermometer. This

professional meter, with proper care, will provide years of safe reliable service.

2. SPECIFICATIONS

2.1 General Specifications

Circuit Custom LSI microprocessor circuit

Display Dual function, 0.5" super large LCD display with

contrast adjustment

Measurement Relative Humidity (RH) and Temperature (°C & °F)

Data Hold function Freezes Display

Sensor Structure Humidity -thin film, capacitance sensor

Temperature -thermistor

Memory Recall Records/Recalls Max, Min and Average readings

Power off Automatic power down to preserve battery life

Data Output RS 232 PC serial interface

Sampling Time Approximately 0.8 seconds

Operating

Temperature Instrument: 32 to 122F (0 °C to 50 °C)

Probe: 32 °F to 140 °F (0 °C to 60 °C)

Operating Humidity < 90% RH

Power Supply 006P DC 9V battery (Heavy duty Alkaline type)

Power Current Approx. 8.5 mA DC

Weight 0.76 lbs. (345 g) including batteries & probe

Size Instrument: 7.1 x 2.8 x1.3" (180 x 72 x 32mm)

Sensor Head: Round, 26mm diameter x 160mm

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2.2 Range Specifications

Range Resolution Accuracy

RH 10% to 95% RH 0.1% RH >70% RH: +(3% rdg + 1% RH);

<70% RH: +3% RH

Temperature

0οC to 50 οC

32 οF to 122 οF0.1 οC

0.1 οF+0.8οC

+1.5 οF

3. FRONT PANEL DESCRIPTION

1. Humidity Display

2. Temperature Display

3. ON/OFF key

4. RECORD key

5. RECALL key

6. RS-232 output jack

7. Sensor input jack

8. Sensor head

9. LCD contrast adjustment

10. Temperature units select

11. Data Hold key

12. Sensor handle

4. OPERATION

4.1 Install the "Sensor Plug" into the "Sensor Input Socket .

4.2 Press "Power Off/On" to turn the instrument power "ON".

4.3 Select the temperature units by pressing "°C/ °F ". The display will indicate "°C" or

"°F" as selected.

4.4 The meter will now display up-to-the-minute humidity and temperature.

4.5 As humidity values of the environment change, it takes a few minutes to obtain a

stable RH reading.

NOTE: For accurate Relative Humidity measurements the meter should be allowed to

stabilize for several minutes in order to adapt to the ambient temperature of the area

where the test is taking place. Also, the probe should be held from the cable end when

making measurements.

4.6 Data Hold:

While taking measurements, pressing "Data Hold" will freeze the displayed value and the

LCD will display the "D.H" indicator. Press "Hold" again to release the data hold function.

4.7 Data Record (Max., Min., and Average RH reading):

When selected, the DATA RECORD function records and stores the max, min and

average readings. To start the DATA RECORD function:

a) Press "RECORD" once. The "REC" indicator will appear on the display.

b) Press "RECALL" once to enter the "Max" mode. The "Max" indicator along with the

maximum reading recorded since the “RECORD” key was first pressed will appear on

the LCD display.

c) Press "RECALL" once, the "Min" indicator along with the minimum reading recorded

since the “RECORD” key was first pressed will appear on the LCD display.

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d) Press "RECALL" once, the "AVG" indicator along with the average value will appear

on the LCD display.

e) To disable the "Data Record" function, press "Record" again. The display indicators

"REC", "Max", "Min", "AVG" will disappear.

4.8 Simplified operational flow diagrams:

5. MEASUREMENT CONSIDERATION

5.1 The meter is designed with an "Auto shut off" feature to preserve battery life. The

meter will automatically shut down after 10 minutes of non-use. To disable this

feature, press the "RECORD" key to engage the record function.

5.2 It may be necessary to adjust the display contrast due to a change in viewing angle or

voltage drift. Use the "LCD Contrast adjustment" located on the right side of the

meter to set the preferred contrast.

6. RS232 DATA BUS OUTPUT

The meter is designed with a built-in RS232 serial data port. This interface was designed

to operate with the Extech Data Acquisition Software (p/n 407000) and enables the user to

capture, store and display readings on a PC. For more information, contact Extech or refer

to the manual accompanying the software for details on the interface.

7. BATTERY REPLACEMENT

7.1 The low battery indication appears as a "LBT" on the left corner of the display. When

the "LBT" appears, replace the battery as soon as possible. Reliable readings can be

obtained for several hours after the first appearance of the low battery indication.

7.2 To replace the battery:

a) Remove the battery compartment cover using a small coin or screwdriver and

remove the battery.

b) Replace with a new 9V battery (heavy duty type) and reinstall the cover.

c) Make sure the battery cover is secured after changing the battery.

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8. HUMIDITY CALIBRATION

Note: Calibration reference solutions are available from Extech (33%: Part No. 407453 and

75%: Part No. 407465).

8.0 The grid located on top of the probe must be removed so that the probe may fit into

the calibration bottles.

8.1 Prior to calibrating, allow the meter and probe to stabilize to room temperature, which

may take 30 minutes or more.

8.2 Remove the battery from the battery compartment to provide access to the calibration

adjustments.

8.3 Place the sensor head into a 33% calibration reference solution. Wait for a stable

reading (up to 30 min). Adjust VR3 (see Fig.2) until the display shows 33.0.

8.4 Place the sensor head into a 75% calibration reference solution. Wait for a stable

reading (up to 30 min). Adjust VR4 (Fig. 2) until the display shows 75.0.

8.5 Repeat steps 8.3 and 8.4 until no further adjustment is required.

8.6 The other adjustments available are:

VR7 -Temperature (oC) zero adjustment

VR6 -Temperature (oC) gain adjustment

9. CALIBRATION / REPAIR SERVICES

Extech offers complete repair and calibration services for all of the products we sell. For

periodic calibration, NIST certification or repair of any Extech product, call customer

service for details on services available. Extech recommends that calibration be performed

on an annual basis to insure calibration integrity.

10. WARRANTY

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and

workmanship for three years 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 for authorization. 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.

including the right of reproduction in whole or in part in any form.

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