Instruction Manual forwireless Magnet Extensometer SML-WMEH
SENSORMATE Technology Inc.
6f., No.5, Ln.83, Sec.1, Guangfu Rd., Sanchong Dist., New Taipei City 241, Taiwan
TEL : +886 2 2999 5245 FAX : +886 2 2995 0782 5
Remark: Only when two sensors are >8° off the correct opposite position,
then we get an error >1% of the measuring value!
*圖A picture A
3. Measuring of load distribution
(= load on each single tie bar)
Procedure:
3.1 Place sensors 1A+1B, 2A+2B, 3A+3B, 4A+4B on each tie bar,
all of the sensors , "A" and "B" should be define on upper side or lower side of tie bar.
3.2 Switch on all sensor "A" only, start running machine, the tablet each window will
display strain value, this is tie bar bending direction strain value.
3.3 Switch off "A" and switch on "B", the same as above procedure, the monitor
display value is tie bar the bending direction strain value.
3.4 Open and close the machine 2...4 times and press ‘RESET’ between each cycle.
The effective, precise measurement can take place as soon as ca. 1...3 digits Offset
remain. The magnet sensors have now settled and are ready.
3.5 The displayed values are bending compensated, because the measuring
values of the two opposite sensors are averaged at the input. The displayed
microstrain (με) values are the tie bar elongation. Example: Display 355 = 0.355mm
tie bar elongation per meter of tie bar
With this value, the clamping force can be calculated.
The new WMEH digital Monitor calculates by push-button directly kN or tons.
The elongation shown is a superposition of load and bending. Very high differences
of both values (e.g. <250με versus >700με) can be an indication that the tie bar has
started cracking.
Theoretical display on how to measure the tie bar bending: One Sensor has no load.
Make sure that this open sensor is not exposed to temperature variations.
