Extech Instruments 407907 User manual

User's Manual
RTD Thermometer
Model 407907
Shown with RTD probe*
* Probe sold separately.

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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. This meter is shipped fully tested and calibrated and with proper use will provide years
of reliable service.
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 Probes (sold separately)
4-wire platinum 100RTD;
0.00385 alpha coefficient (meet DIN IEC 751)
RTD probe jack
Proprietary 4 pin circular connector
(uses Extech RTD probes –sold separately)
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
0.53 lbs. (242g)
Dimensions
7.1 x 2.8 x 1.3” (180 x 72 x 32 mm)
Range Specifications
Temperature Ranges
Resolution
Accuracy (% of reading)
oF
-199.99oto 392.00o F
0.01oF
± (0.1% + 0.4oF) *
392.0oto 1562.0oF
0.1o F
oC
-199.99oto 199.00oC
0.01oC
± (0.1% + 0.2oC) *
200.0oto 850.0oC
0.1o C
* Probe accuracy is additional

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Meter Description
1. RTD probe connector
2. RS232 connector
3. LCD display
4. Keypad
5. RTD probe (Sold separately)
6. Battery compartment (rear)
7. Protective holster
Operation
Connecting the optional RTD probe
Plug the optional 4-wire RTD probe(sold separately) into the jack at the top of the meter. The jack is
keyed and can only be inserted one way. Use care when inserting the probe.
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/0.1o
switch. 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.

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Top View
Data Hold
To freeze a reading on the LCD, press the HOLD button. Temperature readings require 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 for use 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 pin-out
100

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Warranty
FLIR Systems, Inc. warrants this Extech Instruments brand device 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 for authorization. Visit
the website www.extech.com for contact information. A Return Authorization (RA) number must be issued before any product is
returned. 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. FLIR Systems, Inc. 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. FLIR’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.
Calibration, Repair, and Customer Care Services
FLIR Systems, Inc. offers repair and calibration services for the Extech Instruments products we
sell. NIST certification for most products is also provided. Call the Customer Service Department for
information on calibration services available for this product. Annual calibrations should be
performed to verify meter performance and accuracy. Technical support and general customer
service is also provided, refer to the contact information provided below.
Copyright ©2013 FLIR Systems, Inc.
All rights reserved including the right of reproduction in whole or in part in any form
www.extech.com
Support Lines: U.S. [phone]; International: [phone]
Technical Support: Option 3; E-mail: [email protected]
Repair & Returns: Option 4; E-mail: [email protected]
Product specifications are subject to change without notice
Please visit our website for the most up-to-date information
www.extech.com
FLIR Commercial Systems, Inc., 9 Townsend West, Nashua, NH 03063 USA
ISO 9001 Certified