Extech Instruments 407907 Manual de usuario

,User's Manual

RTD Thermometer

Model 407907

Introduction

Congratulations on your purchase of the Heavy Duty Extech 407907 RTD Thermometer

which offers high precision and selectable 0.1oand 0.01oresolution. The LCD display

provides low battery and overload indication. Selectable temperature units °C & °F

provides measurement versatility. Careful use of this meter will provide years of reliable

service.

Model 407907 V 1.1 August 2001

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 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 ext. 210 for

authorization or visit our website at www.extech.com (click on Contact Extech and go to Service

Department to request an RA number). 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.

Specifications

General Specifications

Display 4-1/2 digit (20,000 count) LCD display with over-range

and low battery indication

Measurement Temperature (selectable °C & °F units)

Data Hold Freezes displayed reading

RTD Sensor (optional) 4-wire platinum 100ΩRTD;

0.00385 alpha coefficient (meets DIN IEC 751)

RTD Sensor jack Proprietary 4 pin circular connector

(uses optional Extech RTD sensor)

Sampling Time Approximately 0.4 seconds

Memory record/recall Meter stores Maximum and Minimum readings

Data Output RS-232 PC Interface

Operating conditions Temperature: 32°F to 122°F (0°C to 50°C); RH: < 80%

Power Supply 9V battery

Power consumption 15 mA DC (approx.)

Weight 0.62 lbs. (285g)

Dimensions 7.1 x 2.8 x 1.3” (180 x 72 x 32 mm)

Range Specifications

Temperature Ranges Resolution Accuracy (% of reading)

-199.99oto 392.00o F0.01oF

392.0oto 1562.0oF 0.1o F

± (0.1% + 0.4oF)

-199.99oto 199.00oC0.01oC

200.0oto 850.0oC 0.1o C

± (0.1% + 0.2oC)

Accuracy specifications apply to the meter only. Probe accuracy is additional.

Model 407907 V 1.1 August 2001

Meter Description

1. RTD probe connector

2. RS232 connector

3. LCD display

4. Keypad

5. RTD probe

6. Battery compartment (rear)

7. Protective holster

Operation

Connecting the optional RTD probe

Plug the optional 4-wire RTD probe into the jack at the top of the meter. The jack is keyed

so that the probe cannot be incorrectly inserted; however use care when inserting to avoid

pin damage.

Powering the meter

To power the meter, slide the OFF/ON switch to the ON position. If the display remains

blank, check the 9V battery (rear compartment). Slide the switch to the OFF position to

turn the meter off. Remove the battery if the meter is to be stored for long periods.

Selecting units of measure

Press the oF/oC button to select the desired temperature units. The LCD display will show

the oCor the oFsymbol to indicate the currently selected unit of measure.

Selecting the resolution

The meter offers 0.1oand 0.01odisplay resolution. To select the resolution use the

0.01o/0.1oswitch. The display will reflect the currently selected resolution. Use the

specifications shown earlier in this manual to determine the best resolution for the

measurement range of a given application.

Taking measurements

Once the meter has been setup and a probe has been inserted in the jack at the top of the

meter, place the temperature probe in the area under test. Give the meter several seconds

to stabilize. Read the temperature measurement on the LCD. If dashes appear on the

display, either the reading is out of range or the RTD probe is not connected (or defective).

Maximum and Minimum (MAX/MIN) Record and Recall

When selected, the recording function stores the MAX/MIN readings for later recall.

1. Press the RECORD button once. The RECORD indicator will appear on the display.

2. After readings are taken, press the RECALL button to view the maximum reading. The

MAX indicator will appear on the display to inform the user that the reading now on the

display is the highest reading since the RECORD button was first pressed.

3. Press the RECALL button again to view the minimum reading. The MIN indicator will

appear on the display to inform the user that the reading now on the display is the

lowest since the RECORD button was first pressed.

4. To return to normal operation, press the RECORD button again. The RECORD, MAX,

and MIN indicators will extinguish.

Model 407907 V 1.1 August 2001



Support Hotlines (781) 890-7440

Tech support: Ext. 200; Email: [email protected]

Repair/Returns: Ext. 210; Email: repair@extech.com

Website: www.extech.com

Top View

Data Hold

To freeze a reading on the LCD, press the HOLD button. Temperature readings do take

several seconds to stabilize, therefore use Data Hold only after a reading has fully

stabilized. Press the HOLD button again to return the meter to normal operation.

RS-232 PC Interface

The meter includes a built-in RS232 serial data port. This interface was designed to

operate with the Extech Data Acquisition Software (Extech Part Number 407001) and

enables the user to store readings on a PC. For more information, contact Extech or refer

to the manual accompanying the software for details.

Battery Replacement

The low battery indicator (battery symbol) appears on the LCD when the 9V battery needs

replacing. Reliable readings can be obtained for several hours after the first appearance of

the low battery indicator. To replace the battery:

1. Remove the meter’s rubber protective holster.

2. Remove the battery compartment cover (back of meter) using a small coin or

screwdriver.

3. Replace the 9V battery (heavy duty, alkaline type) and reinstall the cover.

4. Replace the rubber holster.

4-wire RTD input jack pin-out

Calibration and 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.

100Ω

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