Eurotherm 3116 PID Installation Guide Page 104
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Engineering Handbook 3200 Series
102 Part No HA028651 Issue 10.0 Dec -10
16. Calibration
The controller is calibrated during manufacture using
traceable standards for every input range. It is,
therefore, not necessary to calibrate the controller when
changing ranges. Furthermore, the use of a continuous
automatic zero correction of the input ensures that the
calibration of the instrument is optimised during normal
operation.
To comply with statutory procedures such as the Heat
Treatment Specification AMS2750, the calibration of the
instrument can be verified and re-calibrated if
considered necessary in accordance with the instructions
given in this chapter.
For example AMS2750 states:- "Instructions for
calibration and recalibration of "field test
instrumentation" and "control monitoring and recording
instrumentation" as defined by the NADCAP Aerospace
Material Specification for pyrometry AMS2750D clause
3.2.5 (3.2.5.3 and sub clauses), including Instruction for
the application and removal of offsets defined in clause
3.2.4.”
16.1 To Check Input Calibration
The PV Input may be configured as mV, mA,
thermocouple or platinum resistance thermometer.
16.1.1 Precautions
Before checking or starting any calibration procedure the
following precautions should be taken:-
1. When calibrating mV inputs make sure that the
calibrating source output is set to less than
250mV before connecting it to the mV
terminals. If accidentally a large potential is
applied (even for less than 1 second), then at
least one hour should elapse before
commencing the calibration.
2. RTD and CJC calibration must not be carried
out without prior mV calibration.
3. A pre-wired jig built using a spare instrument
sleeve may help to speed up the calibration
procedure especially if a number of instruments
are to be calibrated.
4. Power should be turned on only after the
controller has been inserted in the sleeve of the
pre-wired circuit. Power should also be turned
off before removing the controller from its
sleeve.
5. Allow at least 10 minutes for the controller to
warm up after switch on.
16.1.2 To Check mV Input Calibration
The input may have been configured for a process input
of mV, Volts or mA and scaled in Level 3 as described in
section 8.3. The example described in section 8.3.1
assumes that the display is set up to read 2.0 for an input
of 4.000mV and 500.0 for an input of 20.000mV.
To check this scaling, connect a milli-volt source,
traceable to national standards, to terminals V+ and V-
using copper cable as shown in the diagram below.
Figure 1: Connections for mV Input Calibration
☺ Ensure that no offsets (see sections 8.2.1 and 16.2)
have been set in the controller.
Set the mV source to 4.000mV. Check the display reads
2.0 +
0.25% + 1LSD (least significant digit).
Set the mV source to 20.000mV. Check the display reads
500.0 +0.25% + 1LSD.
16.1.3 To Check Thermocouple Input
Calibration
Connect a milli-volt source, traceable to national
standards, to terminals V+ and V- as shown in the
diagram belo
w. The mV source must be capable of
simulating the thermocouple cold junction temperature.
It must be connected to the instrument using the correct
type of thermocouple compensating cable for the
thermocouple in use.
Figure -2: Connections for Thermocouple Calibration
Set the mV source to the same thermocouple type as
that configured in the controller.
Adjust the mV source for to the minimum range. For a
type J thermocouple, for example, the minimum range is
-210
O
C. However, if it has been restricted using the
Range Low parameter then set the mV source to this
limit. Check that the reading on the display is within
+
0.25% of reading + 1LSD.
Adjust the mV source for to the maximum range. For a
type J thermocouple, for example, the minimum range is
1200
O
C. However, if it has been restricted using the
Range High parameter then set the mV source to this
limit. Check that the reading on the display is within
+
0.25% of reading + 1LSD.
Intermediate points may be similarly checked if required.
Thermocouple
Compensating cable
Thermocouple
simulator set to
T/C type
+
-
Controller
VI
V
-
V+
Copper cable
mV
Source
+
-
Controller
VI
V
-
V+
- Engineering Handbook 1
- Contents 3
- Issue Status of this Manual 7
- 1.3 Dimensions 8
- 1.4 Step 1: Installation 9
- 1.5 Order Code 10
- 2. Step 2: Wiring 11
- 2.4 Wire Sizes 13
- 2.5 Precautions 13
- Local ground 16
- Diagram 17
- ☺ Helpful hints 18
- Pollution Degree 2 19
- 4. Switch On 20
- Subsequent Starts 21
- 4.4 Front Panel Layout 22
- buttons 23
- 5. Operator Level 2 24
- ☺ Press 27
- 5.4 Timer Operation 28
- 5.5 Dwell Timer 29
- 5.6 Delayed Timer 29
- 5.7 Soft Start Timer 30
- 5.8 Programmer 30
- SERVO MODE 31
- 6.1 Parameter Levels 33
- ☺ Press and hold 35
- 6.3 Navigation Diagram 36
- 6.4 Access Parameters 37
- 7. Controller Block Diagram 39
- 8.2 PV Offset 43
- 8.3 PV Input Scaling 43
- 9. Input/Output 44
- 1. fu n c 47
- 9.1.7 Output List 2 (OP-2) 48
- 9.1.8 Output List 3 (OP-3) 49
- 10. Setpoint Generator 53
- 11. Control 55
- 11.2 Control Parameters 57
- 11.2.2 Integral Term ‘TI’ 59
- 11.2.3 Derivative Term ‘TD’ 60
- 11.2.5 High and Low Cutback 61
- 11.2.6 Manual Reset 61
- 11.2.7 Control Action 61
- 11.2.8 Loop Break 61
- 11.2.9 Cooling Algorithm 61
- 11.3 Tuning 62
- 11.3.3 Automatic Tuning 64
- 11.3.4 To Start Autotune 64
- 11.3.8 Manual Tuning 68
- 12. Alarms 73
- 12.2.1 Example 1 76
- 12.2.2 Example 2 76
- 12.2.3 Example 3 76
- 12.3 Alarm Parameters 77
- 12.4 Diagnostic Alarms 79
- 13. Timer/Programmer 80
- 13.2 Programmer 82
- Rm p. 1 84
- Configure the Timer 86
- 15. Digital Communications 90
- ☺ EIA232 92
- ☺ EIA485 2-wire 92
- Address 93
- 15.4 DATA ENCODING 93
- 16. Calibration 104
- 16.2 Offsets 105
- 16.3 Input Calibration 107
- CALIBRATION 108
- FAIL’ if not. Fail may be 108
- 16.3.6 CT Calibration 112
- 16.4 Calibration Parameters 113
- 17.1 Loading an IDM 114
- 17.3 Starting iTools 115
- 17.4 Starting the Wizard 116
- 17.5 To configure the Input 117
- 17.6 To Configure Alarms 118
- 17.7 To Customise Messages 119
- 17.8 To Promote Parameters 123
- 17.10 To Set up Recipes 126
- 17.11 Summary 129
- 17.12 Cloning 130
- Power requirements 131
- 19. Parameter Index 133
- 20. Index 135
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