Humidity Calibration; Calibration / Repair Services; Warranty - Extech Instruments 407445 Instruction Manual

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:
o
VR7 - Temperature (
VR6 - Temperature (

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.
Copyright © 1999 Extech Instruments Corporation. All rights reserved
including the right of reproduction in whole or in part in any form.
C) zero adjustment
o
C) gain adjustment
4 407445es Ver. 1.04 9/99