Helios Large Display Temperature Meter Instruction Manual
PD2-7000
42
Offset Adjust (
Adjust
)
This parameter allows the user to select an offset adjustment to the temperature being displayed. Offset
adjustment values can be either positive or negative and can be any number within
50.0
F (+27.8
C). The
offset adjustment value is programmed through the
Adjust
menu.
The offset adjustment feature can be useful to compensate for errors due to thermocouple junctions or
excessive lead wire resistance in RTDs.
Note: The offset adjustment value is not reset to zero when the type of temperature sensor is changed
(i.e. TC type or RTD curve). Celsius/Fahrenheit conversion must be made manually by the user.
Recalibration of the Meter (
t CAL
)
The
Calibration
(
t CAL
) menu is used to
recalibrate
the thermocouple and RTD inputs.
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 13.
2. Set up the meter to accept the selected input (e.g. type J T/C), see page 26.
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.
•
The meter is factory calibrated prior to shipment to
read temperature in degrees Fahrenheit. The
calibration equipment is certified to NIST standards.
•
There is no need to calibrate the meter, simply
select the input type, °F or °C, and decimal point.
•
Check calibration of the meter at least every
12 months.
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