PRECISION DIGITAL PD8-7000 Series, Инструкция по эксплуатации

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ProtEX-MAX PD8-7000 Explosion-Proof Temperature Meter Instruction Manual
47
Internal Temperature Calibration (
ICAL
)
The meter is factory calibrated prior to shipment to read temperature in
degrees Fahrenheit. The calibration equipment is traceable to NIST standards.
The Internal Calibration (
ICAL
) is a function used at the factory to calibrate all the thermocouple and RTD
ranges. This procedure should only be used by qualified personnel.
To recalibrate the meter for a specific input and range, refer to page 42 Recalibration of the Meter (
t
CAL
).
Notes:
1. If meter is in operation and it is intended to accept only one input type (e.g. 100 Pt),
recalibration of other inputs is not necessary.
2. Allow the meter to warm up for at least 30 minutes before performing the calibration
procedure.
3. Use the
Recalibration of the Meter (
t CAL
)
procedure found on page 42
.
The
Internal calibration
menu is part of the
Advanced Features
menu and is described in the following
pages. This procedure should only be used by qualified personnel.
Note: Most users should not require the use of the Internal Calibration procedure. The T CAL procedure
should be used instead of the ICAL procedure.
Thermocouple Input Internal Calibration (
ICAL
)
1. Set the Type selector switch in the TC position and using copper wire connect a precision mV
calibrator to the input.
2. In the
Setup
menu select the input: TC – Type J.
3. Press and hold the Menu button for three seconds to access the advanced features of the meter.
4. Press the Up arrow button to scroll to the
Internal calibration
menu (
ICAL
) and press Enter.
5. The meter displays either current calibration (
mref
). Press Enter to start the calibration process.
6. Measure the room temperature in degrees Celsius using a reliable reference, enter the room
temperature (e.g. 25.0), and press Enter.
7. The meter displays
0mv
, apply an input equal to 0.000 mV and press Enter. The display flashes
while accepting the 0 mV input; press Enter again when the display stops flashing.
8. The meter displays
100mv
, apply an input equal to 100.000 mV and press Enter. The display
flashes while accepting the 100 mV input; press Enter again when the display stops flashing.
9. Apply 0 mV, the meter should read room temperature.
10. This completes the calibration of all the thermocouple ranges.