ProtEX-MAX PD8-7000 Explosion-Proof Temperature Meter Instruction Manual
42
Recalibration of the Meter (
t CAL
)
The
Calibration
(
t CAL
) menu is used to
recalibrate
the thermocouple and RTD inputs.
•
The meter is factory calibrated prior to shipment to read temperature in degrees
Fahrenheit. The calibration equipment is traceable to NIST standards.
•
There is no need to calibrate the meter, simply select the input type, °F or °C, and
•
Check calibration of the meter at least every 12 months.
Allow at least 30 minutes warm-up time before performing recalibration procedure to ensure specified
accuracy.
Recommended Calibration Points
To recalibrate the meter, it is recommended to use the Fahrenheit scale; this will give a greater degree of
accuracy to the calibration. The scale can be changed to the Celsius scale after calibration is completed.
The meter will display temperature accurately in any scale. The following table shows the recommended
low and high calibration points for all types.
Type of input Input 1
(Low)
Input 2
(High)
Check
(Middle)
Type J
32
F
1184
F
600
F
Type K
32
F
1895
F
960
F
Type T
32
F
698
F
360
F
Type E
32
F
1652
F
800
F
Type R
32
F
3110
F
1500
F
Type S
32
F
3110
F
1500
F
Type B
32
F
3110
F
1500
F
Type N
32
F
1472
F
700
F
Type C
500
F
3650
F
1800
F
10
Cu RTD
32
F
9.035
450
F
18.032
200
F
12.639
100
Pt RTD
(0.00385)
32
F
100
1148
F
320.12
590
F
215.61
100
Pt RTD
(0.00392)
32
F
100
1148
F
324.49
590
F
217.89
120
Ni RTD
32
F
120
410
F
315.31
221
F
205.22
1000
Pt RTD
(0.00385)
32
F
1000
900
F
2750.4
450
F
1876.5
1000
Pt RTD
(0.00392)
32
F
1000
900
F
2785.1
450
F
1893.7
Recalibration Procedure
1. Connect signal to the meter using the appropriate wire (e.g. type J thermocouple wire to recalibrate
type J input), see page 15.
2. Set up the meter to accept the selected input (e.g. type J T/C), see page 29.
3. Set up the meter to display temperature in degrees Fahrenheit.
4. Apply signal corresponding to input 1 (32°F) and program the display to read 32.0.
5. Apply signal corresponding to input 2 (1184°F for type J) and program the display accordingly.
6. After the meter accepts input 2, the display returns to reading mode. This completes the recalibration
procedure for the selected input.
