Benetech GM510, Operation Manual, Page: 6 / 7

-08- -09-
Reset and calibration
Before being sent out of factory, the device has
been properly reset and calibrated with which
consumers are not expected to operate.
Reset
Pressure difference shall read zero after turning on, if
not, reset the device as the steps below: press the DIF
key and DIFFERENTIAL PRESSURE shows on the LCD,
meanwhile hold on pressing on the HOLD key for about
3 seconds until the zero appears which indicates the
reset is done, release the HOLD key and backlight key
to return to normal measure mode
Calibration
In operation, if there is any error between the device
and your standard, please calibrate it as the steps below:
Power on.
Hold on pressing the
HOLD
key and backlight key for
about 3 seconds until the reading shows on
LCD with its unit that is inner value of the
device, which may be ignored by the users and
indicates it is under calibration mode and the 2 keys
said above could be released.
1
.
2
.
(1)
(2)
“
1.00
”
“
kPa
”
(3)
GM510/GM511
：
1
.
00kPa~10
.
00kPa
，
-1
.
00kPa~-10
.
00kPa
GM520
：
1
.
00kPa~35
.
00kPa
，
-1
.
00kPa~-35
.
00kPa
(4)
(5)
3.
：
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Press on the
DIF
key to increase 1 kPa and hold on
pressing the
DIF
key for 2 seconds to increase the
value quicker.
calibration range
calibration range
Press the
HOLD
key after selecting the desired value
for calibration and import the differential value into
the device.
Press the backlight to exit calibration mode and
return to normal measurement mode. If there is any
further calibration repeat the step4 and step 5.
Restore ex-factory setting
Users may restore the device to ex-factory settings if
the calibration data confused due to mistake operation.
Holding on pressing the
DIF
key,
HOLD
key, backlight
key and
REC
key at one time
Power on the device
After full display and 0 appears release the
REC
key
At 00 appearing release the backlight key
At 000 appearing press the backlight key and
REC
key
At 0000 appearing release all the keys and complete
the operation
After restoring to ex-factory setting, refer to point 1
and point 2 above for reset and calibration if necessary.
10
.
Battery replacement
“ ”
flashes when the battery is insufficient, replace
it with 4 1.5V AAA batteries.