MRF
16/22
MF 55-GB 1.21
37
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20.0
iP
ACCS
OFS.H
CAL.P
CAL
Pnt.L
OFS.L
Pnt.H
codE
*C
*C
measured temperature;
use
T
/
S
to access
setpoint
user 2-point
calibration
for factory access to
lists and parameters
not available to the
operator
enter
password
if user
calibration
10.4 User calibration of over temperature
The controller uses dual point calibration at two temperatures for more accurate
temperature control. The calibration parameters are Offset low and Offset High.
Recommended settings for the two points are 800°C and 1400°C, but these are
adjustable. Positive or negative offsets may be used, determined by calibration of the
thermocouple and controller.
Thermocouple calibration
The thermocouple must be removed from the MRF 16/22 and calibrated by comparison
using a calibrated heat source.
Controller calibration
The controller and thermocouple connection cables must be calibrated by injecting milli-
volts down the thermocouple cables into the controller from a calibrated source.
To enter dual calibration points and offsets to the controller
[See navigation diagram 11.2]
First access the calibration page. From the homes display:
Press page
twice to get to iP.
Press scroll
3
then up
S
or down
T
to select access code 9.
If the correct password is entered, the display shows ‘Pass’.
Press scroll
3
to get to CAL, then up
S
or down
T
to select USEr (user values).
Press scroll
3
to get to Pnt.L then up
S
or down
T
to enter the Low Point temperature.
Press scroll
3
to get to OFS.L then up
S
or down
T
to enter the Low Offset.
Press scroll
3
to get to Pnt.H then up
S
or down
T
to enter the High Point
temperature.
Press scroll
3
to get to OFS.H then up
S
or down
T
to enter the High Offset.
10.5 Navigation diagram - calibration of over temperature controller
