17
CALIBRATION
FIg. 11
Dip switch location: To start calibration, V2 must
be OPEN.
GENERAL GUIDELINES FOR CALIBRATION
NOTE:
All 1601 are calibrated at the manufacturing
plan. It is not necessary to calibrate the 1601
on receipt.
For an good calibration it is necessary to proceed
as follows:
1) - The controller under calibration should be
mounted in its case in order to keep the
internal temperature stable.
2) - The ambient temperature should be stable.
Avoid any drift due to air-conditioning, etc.
3) - The relative humidity should not exceed 70%.
4) - Minimum warm-up time must be 20 minutes.
5) - If possible, operate in a noise free environ-
ment
6) - During calibration, connect one input at a time
to the rear terminal block.
+
+
1
3
4
2
PZ3
PZ4
PZ5
V2
B
L4
C6
C10
C5
C8
L3
L2
C7
R7
R8
J6
J5
2
C14
C2
R4
R5
R11
Q2
R3
PZ2
PZ1
C15
K2
C9
V2
WORNING:
Do not attempt calibration without the
recommended simulator or calibrator.
For this calibration procedure it is necessary to
use calibrators with the following accuracy and
resolution:
ACCURACY
1) For TC input: + 0.005% 0.001% range
+ 5
m
V
2) For RTD input: + 0.02 % + 0.0025
W
/decade.
3) For cold junction compensation: better than 0.1
°C
RESOLUTION
1) For TC input: 1
m
V
2) For RTD input: 10 m
W
3) For cold junction compensation: better than 0.1
°C
CALIBRATION PROCEDURE
Calibration parameters are logically divided in
groups of two parameter each (initial and final
scale value). After each group, the calibration
check is provided but it is also possible to bo the
check without calibrating.
NOTE
:
Pushing the SMART pushbutton goes back to the
previous parameter without modifying the
calibration.
All the controllers are originally calibrated at the
factory by means of calibrators with high accuracy
and resolution.
1601-1-0C.p65
5/2/00, 1:45 PM
17