Extech Instruments 407445 User manual

Page 1 Model 407445 Version 2.2 February 2004

INSTRUCTION MANUAL

Model 407445

Heavy Duty Hygro-Thermometer

Introduction

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

407445 displays Temperature & Relative Humidity simultaneously and includes a built-in

PC interface. This professional meter, with proper care, will provide years of safe reliable

service.

Page 2 Model 407445 Version 2.2 February 2004

Specifications

General Specifications

Display Dual function LCD display with contrast adjustment

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

Data Hold Freezes Display

Sensor types Humidity: Thin film, capacitance sensor

Temperature: Thermistor

Memory Recall Records/Recalls MAX, MIN, and Average readings

Power off Automatic power off after approx 10 minutes of inactivity

Data Output RS 232 PC serial interface

Sampling Time Approximately 0.8 seconds

Operating

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

Probe: 32 to 140°F (0 to 60°C)

Operating Humidity < 90% RH

Power Supply 9V battery

Power Consumption Approx. 8.5 mA DC

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

Size Instrument: 7.1 x 2.8 x 1.3" (180 x 72 x 32mm)

Sensor head: 1” diameter x 6.3” (26mm x 160mm)

Range Specifications

Range Resolution Accuracy

RH 10% to 95%

RH 0.1% RH >70% RH: ± 4% RH

< 70% RH: ± 3% RH

Temperature 32οF to 122οF

(0οC to 50οC) 0.1ο F/C ± 1.5 οF (± 0.8οC)

Page 3 Model 407445 Version 2.2 February 2004

Meter Description

1. Sensor input

2. RS-232 serial output jack

3. LCD Display

4. Keypad

5. Sensor

6. LCD contrast adjustment

7. Protective rubber jacket

8. Battery compartment and calibration pots on rear

Page 4 Model 407445 Version 2.2 February 2004

Meter Operation

Getting Started

1. Plug the sensor into the sensor jack at the top of the meter.

2. Press the Power OFF/ON key to turn the instrument on or off.

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

or "°F" as selected.

4. The meter will now display the per cent relative humidity and the temperature.

NOTE: For accurate relative humidity measurements the meter should be allowed

several minutes to adjust to ambient temperature changes.

Data Hold

Press the Data Hold key to freeze the displayed temperature and humidity readings. The

HOLD icon will appear on the display in the Data Hold mode. Press the Data Hold key

again to exit the Data Hold mode.

MAX, MIN, and AVG Record / Recall

1. Press the RECORD key to begin. The REC indicator will appear on the display and the

meter will begin tracking the highest (MAX), lowest (MIN), and average (AVG)

readings.

2. Press the RECALL key to display the highest (MAX) reading. The MAX indicator along

with the maximum reading recorded since RECORD was first pressed will appear.

3. Press the RECALL key again to view the lowest (MIN) reading.

4. Press the RECALL key again to view the average reading (AVG).

5. To exit, press the RECORD key.

Measurement Considerations

1. The meter includes an Auto Power OFF feature that turns the instrument off after

approximately 10 minutes of inactivity. To disable this feature, press the RECORD key

to enable the MIN/MAX/AVG function.

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.

Page 5 Model 407445 Version 2.2 February 2004

RS-232 Serial PC Interface

This instrument includes a built-in RS-232 serial data port. This interface is intended for

use with the Extech Data Acquisition Software (PN 407001). For more information, contact

Extech or refer to the manual accompanying the 407001 software package.

Battery Replacement

1. The low battery indicator (LBT) appears on the left corner of the display when the

battery requires replacement. Reliable readings can be obtained for several hours after

the first appearance of the low battery indicator.

2. To replace the battery:

a) Remove the rubber jacket that encases the meter.

b) Open the rear battery compartment using a small coin or screwdriver.

c) Replace the 9V battery and re-assemble the meter.

Page 6 Model 407445 Version 2.2 February 2004

Calibration

Humidity Calibration

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

75%: Part No. 407465).

1. The grid located on top of the sensor must be removed so that it may fit into the

calibration bottles.

2. Prior to calibrating, allow the meter and probe to stabilize to room temperature.

3. Open the battery compartment to access the calibration adjustments (see diagram

below).

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

reading (up to 30 minutes). Adjust VR3 until the display reads 33.0%.

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

reading (up to 30 minutes). Adjust VR4 until the display reads 75.0%.

Temperature Calibration

Note that the temperature calibration adjustments are rarely required. However if a

temperature calibration is in order, the user must have access to an environmental

chamber capable of providing 21oC and 50oC conditions. Allow time for the chamber and

the meter sensor to stabilize (30 minutes approx.) and then adjust the appropriate

potentiometer (see below):

•VR7 - Temperature 21oC adjustment

•VR6 - Temperature 50oC adjustment

Page 7 Model 407445 Version 2.2 February 2004

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.

Page 8 Model 407445 Version 2.2 February 2004



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

Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451

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.

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