EXTECH 475055

User’s Guide
Models 475055
Digital Force Gauge
Congratulations on your purchase of Extech’s Model 475055 Digital Force Gauge that
measures Tension or Compression (pull/push) to 220 lbs. It features: Peak hold,
fast/slow response time, positive or reverse display direction, and a separate sensor. An
RS-232 PC interface provides data acquisition functionality. This meter is shipped fully
tested and calibrated and with proper use will provide years of reliable service.
Meter Description
Sensor socket
LCD display
Kg/N/lb switch
Off/On/Peak switch
Sensor plug
Sensor loop
S-type load sensor
Sensor hook
10. Mounting Holes with
screws (included)
475055 - Version 2.0 - May 2006
Preparation for Measurement
The 475055 automatically determines Tension or Compression (pull/push) force
during use. Compression displays as a negative value and Tension displays as a
positive value.
Select units of measure (kilograms, pounds, or Newtons) via the units select
Screw in the sensor hook and loop on the load sensor and then connect the sensor
to the meter via the input jack on top of the meter.
Select FAST (0.2 seconds) or SLOW (0.6 seconds) update rate.
Zero the display before each measurement via the Zero button.
Note: The sensing head with adapter must be in line with the object being measured.
Avoid rotating the sensing head. Refer to the Figure 1.
Figure 1 ─ Correct and Incorrect Angles of Measurement
Not Acceptable
Measurement Mode
Slide the POWER switch to the ON (I)position. Reverse the LCD display if desired
via the Display Reverse key.
Zero the meter before each measurement.
Touch the adapter to the object being measured in a straight line. Refer to Fig.1.
Begin measurement by applying force (Push or Pull). Read the LCD display.
After completing the measurement, the display will indicate "0.00" if the position
and angle of the Force Gauge have not changed.
Note: Be sure to press "ZERO" before taking a new measurement.
Overrange Indication
The Model 475055 uses a strain gauge sensor to measure force. Avoid subjecting the
instrument to forces outside the specified measurement range. The sensitive strain gauge
can be damaged or otherwise compromised by misuse. When an over-range condition is
sensed by the meter the LCD displays all dashes.
Note that the dashes are shown at the top of the LCD (
) for tension measurements and
at the bottom of the display (--------) for compression measurements.
475055 - Version 2.0 - May 2006
Peak Load Measurement
Slide the POWER switch to the PEAK position.
Touch the adapter to the object being measured in a straight line, refer to Fig. 1.
Zero the meter before each measurement.
Begin measurement by applying force (pull or push). The LCD will display the peak
value, which is the highest reading encountered.
After completing the measurement, the display will hold the peak reading until a
higher reading is reached or the switch is moved out of the peak hold position.
Note: Be sure to press "ZERO" before taking a new measurement.
Fast/Slow selection
Press the FAST/SLOW key to select the desired display update rate. The “FAST” icon will
appear in the display when FAST is selected.
For best results, mount the Digital Force Gauge to a test fixture. Mounting holes are
provided on the rear of the meter for use with fixtures and test stands.
Display Backlight
Pressing the backlight button momentarily will turn on the backlight. After approximately 15
seconds, it will automatically shut off.
RS-232 PC Interface
The 475055 is equipped with a 3.5mm phone jack (meter bottom) for connection to a PC
for data acquisition purposes. To obtain optional PC interface cabling and Windows data
acquisition software (Model 407001A), contact Extech Instruments. Instructions for use are
provided with the software/cable kit.
475055 - Version 2.0 - May 2006
Battery Replacement
The low battery indication appears as a "LO" on the display when battery voltage is less
than 6.8V. To replace the battery:
1. Remove the two screws from the battery compartment cover.
2. Lift off the battery cover.
3. Replace with six (6) 1.5V ‘AA’ batteries.
4. Replace compartment cover and screws.
220 lbs, 100kg, 980 Newtons
Accuracy (23 C)
±(0.5%rdg + 0.1lbs, 0.1kg or 0.4N)
0.05lbs, 0.05kg, 0.2 Newtons
Overload Capacity
Custom LSI microprocessor
Zero adjust
Button for Peak Hold and normal display zero
5 digit LCD type; Digit height: 0.63” (16 mm)
Update Rate
Fast mode 0.2 seconds; Slow mode 0.6 seconds
Over range Indicators
LCD displays “
“ for tension measurements and “--------“ for
compression measurements
Zero / Tare Control
Up to Maximum capacity
Full Scale Deflection
Transducer type
S-type load cell with 2 hooks (thread size: M6 x 1mm ISO)
and 6.5 ft (2m) cable
Peak Hold
Freezes Max reading on display
Data Output
RS-232 serial interface with 16-bit data stream output
Operating Temperature
32 °F to 122 °F (0°C to 50°C)
Operating RH
Max. 80% Relative Humidity (RH)
Power Supply
6 x 1.5V ‘AA’ batteries or 9VDC adapter (not included)
Power consumption
28mA (approx.)
Meter: 1 lb (450g)
Sensor: 0.84 lbs (380g)
Meter: 8.5 x 3.5 x 1.8” (215 x 90 x 45 mm)
Sensor with 2 hooks: 4.7 x 2 x 0.7” (130 x 51 x 18 mm)
Cable length: 6.5 ft. (2m)
Test Stand Mounting
Located on rear (thread size: M5 x 0.8mm ISO); mounting
screws included
475055 - Version 2.0 - May 2006
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.
EXTECH INSTRUMENTS CORPORATION warrants the basic 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 EXTENSION 210 for authorization or visit www.extech.com for
more 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.
Support line (781) 890-7440
Technical support: Extension 200; E-mail: [email protected]
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
Copyright © 2006 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form
475055 - Version 2.0 - May 2006