Two-point calibration | Marathon Computer AACC 2000 guide

Marathon Monitors Inc.

Two-point calibration

The previous section described how to apply a offset, or trim, calibration, which applies a fixed offset over the full display range of the controller. A two-point calibration is used to calibrate the controller at two points and applies a straight line between them. Any readings above, or below, the two calibration points will be an extension of this straight line. For this reason it is best to calibrate with the two points as far apart as possible.

Displayed Value		Offset introduced
				User Calibration
Calibration high-point value				Factory Calibration
Calibration high-point value				Factory Calibration
High-point calibration				x
Low-point calibration				x
		x

Calibration low-point value
Calibration low-point value

Offset introduced

Proceed as follows:

1.Decide upon the low and high points at which you wish to calibrate.

2.Perform a two point calibration in the manner described below

Input list header

Press until you reach the input list header, ‘ip LiSt’.

Press until you reach the ‘CAL’ display.

Calibration type

x 3	∙	FACt:	Factory Calibration

	∙	USEr:	User Calibration

Use or to select ‘USEr’.

Selecting ‘USEr’ enables two-point calibration.

[If two-point calibration is unsatisfactory, select ‘FACt’ to return to the factory set calibration.]

Press

AACC 2000 Carbon

89

Nov. 1, 1997

Image 89

Marathon Computer AACC 2000 manual Two-point calibration, Displayed Value

Contents

Copyright Marathon Monitors INC Marathon Monitors Inc Mechanical Installation Electrostatic discharge precautions SafetyCleaning Electromagnetic compatibility Wiring Safety SymbolsPower Isolation Personnel Overcurrent protection Over-temperature protectionVoltage rating Conductive pollution Routing of wires Installation requirements for EMCGrounding of the temperature sensor shield Equipment ratings Environmental ratings General Electrical safety Marathon Monitors Inc Installation Outline dimensions Model 2000 controller Outline dimensions Model Introduction To install the controllerController labels Unplugging and plugging-in the controller Model Aacc 2000 rear terminal layout Rear terminal layouts Marathon Monitors Inc Module 1, 2 Sensor input connections Snubbers Two terminal modules Dual output modules Four terminal modulesCOM Connections for Process Value 2 PV2 Connections for Process Value 3 in module position Communication module EIA-485 wiring Wiring of 2-wire EIA-485 serial communications link Marathon Monitors Inc Operation Front Panel LAYOUTs 26.0 OP1 Button or Name ExplanationOP2 SP2 Basic operation Alarms Operating modes Output power demand Automatic modeHome display Display units Setpoint Manual Mode List header displays Parameters and HOW to Access Them Marathon Monitors Inc To change the value of a parameter Parameter namesParameter displays OFF List1OFF PID.1 PID STD Fact Pass Hydrogen or CO constant Name Description Prob Probe list Process FactorMillivolt input Offset Name Description DrA TunEDrA.t Adc SEt Pid PID listRES Hcb Input list Setpoint list InFo Information list Output listCmS Comms list FF.OP Access List Alarms Display What it means What to do about it Shows Diagnostic alarms 2b Diagnostic alarms Access Levels Access to Read-only Configuration Access list headerPassword entry Level selection Configuration passwordConfiguration level Edit level Setting operator access to a parameterReturning to Operator Level Hiding or revealing a complete list Promoting a parameter This sheet intentionally left blank Parameter Code Meaning or Function Tuning How to tune One-shot Tuning Adaptive tune Typical automatic tuning cycleCalculation of the cutback values Manual Tuning Proceed as follows Setting the cutback values Automatic droop compensation Adc Integral action and manual reset Motorized valve control Name Description Values Mtr Motor list Min Max Default Inertia and backlash settings Adjusting the minimum on-time ‘mp.t’ Marathon Monitors Inc Set the transfer point Enable in configuration levelGain scheduling Configuration Press to enter configuration Selecting configuration level Changing the passwords Leaving Configuration Level LIN REUD1SA Enab SB.OP None RelyCMS YES DIG PMV Name Description Values Meaning InSt Instrument configurationH2O SP.FF CJC Process value configInput configuration VAL.H Setpoint configurationVAL.L Alarm Modes Alarm configuration ValuesTable a Alarm types Value IMP Digital input 1 configuration Action on contact closureDigital input 2 configuration Action on contact closure Pflt Alarm relay configurationVflt Combining several digital events on to one output Comms 1 module config Cool Module config1A b C1 Module 1 configuration For ‘id’ = ‘LoG.i’ i.e logic input use the LA Conf’ list on 2A/b/C Module 2 configuration Displayed value low SEL 3A/b/C Module 3 configuration Module configuration C Module configuration VAL.8 Point Custom LinearisationVAL.1 CAL Exit Exit configuration Password configurationDC Output Calibration User calibration User calibration Calibration Configuration List User Calibration EnableUser Calibration Enable Exit configuration Calibration type Offset calibrationInput list header Set Offset See table on the right for additional parameters Displayed Value Two-point calibration Select Low-point Calibration Adjust low-point calibration Select High-point Calibration Adjust High-point Calibration Name Parameter description Meaning Calibration points and Calibration offsets Parameter Table Default HY1 Ssel FLT3 Marathon Monitors Inc AL1 Module 2A High Value VAL.1 101 Index Two-point calibration User calibration Aacc 2000 Carbon