Despatch MIC1422 Controller User Manual

Page 82

Alarms
Maximum Number:

Two "soft" alarms plus Loop Alarm*

Maximum # Outputs:

Up to 2 outputs can be used for alarm purposes

Combination Alarms:

Logical OR or AND of alarms to an individual hardware output is
available.

Hysteresis:

1 LSD to 10% of span

Loop Alarm:

Detects faults in the control feedback loop by continuously
monitoring process variable response to the control output(s)

Performance

Reference Conditions
Ambient Temperature:

20º C ± 2º C

Relative Humidity:

60 - 70%

Supply Voltage:

90 - 264 VAC 50 Hz ± 1 %

Source Resistance:

<10 ohm for T/C input

Lead Resistance:

<0.1 ohm/lead balanced (Pt100)

Performance Under Reference Conditions
Common Mode

Rejection:

>120dB at 50/60Hz giving negligible effect at up to 264V, 50/60Hz

Series Mode
Rejection:

>500% of span (at 50/60Hz) causes negligible effect

DC Linear Inputs

Measurement Accuracy: ± 0.25% of span ± -1 LSD
Thermocouple Inputs

Measurement Accuracy: ± 0.25% of span ± -1 LSD

Note: Reduced performance with Type B T/C between 100-600º C (212 - 1112º F)
Note: Thermocouple must not be grounded! Damage to the cold junction in
the control will result!

Linearization Accuracy:

Better than ± 0.2º C any point, any 0.1º C range (± 0.05º C typical).
Better than ± 0.5º C any point, any 1º C range.

Cold Junction
Compensation:

Better than ± 0.7ºC

RTD Inputs Measurement
Accuracy:

± 0.25% of span ± 1 LSD

Linearization Accuracy:

Better than ± 0.2º C any point, any 0.1º C range (± 0.05ºC
typical).
Better than ± 0.5ºC any point, any 1ºC range.