Model 2000 Flow Computer Instruction Manual
2.0
GENERAL
DESCRIPTION
Model 2000 issue 21
Page No
47
2.5.3.
SWITCHED OUTPUT SIGNALS
Twelve open collector switched outputs are provided, on each fitted Output board. These can be selected to be alarm
outputs or pulse outputs proportional to total flows for telemetry purposes or valve or lubrication control outputs or grab
sampler outputs. All outputs are npn transistors and can be selected to be in a conducting or non-conducting state when the
alarm is present. Each output is rated as follows:-
Transistor outputs (open collector)
Absolute Maximum continuous voltage
30Vdc.
Absolute Maximum continuous current
35mA.
Absolute Maximum continuous Power
100mW.
2.6.
ALARMS, WARNINGS AND FAULTS
There are five categories of Alarms and Warnings :-
1) Accountable
alarms
2) Non-accountable
alarms
3) Temperature
alarm
4) Fault
alarm
5) Warnings
All types of alarm will illuminate the appropriate LED on the front panel, will be indicated on the Alarm display pages and can
operate a digital transistor output provided that an output is available and has been set up for that purpose. Note that
warnings, temperature alarms and non-accountable alarms will all cause the non-accountable LED to be illuminated. All
accountable alarms will cause the accountable alarm LED to be latched ON this can only be cleared when the alarm has
been reset and the alarm line is cleared from the Alarm display pages.
Details of all alarm identification is given in Alarm Information..
2.6.1.
ACCOUNTABLE ALARMS
The accountable alarm LED will remain latched ON after the alarm condition has been cleared, it can be switched OFF once
the alarm condition has cleared by operating the accountable alarm clear function in the Alarm display pages. All
Accountable alarms can be selected to operate an Accountable Alarm output if the unit is set-up to provide such an output.
2.6.1.1.
GENERAL ACCOUNTABLE ALARMS
An accountable alarm will be indicated when any of the following conditions occur:-
1)
Pressure sensor 1 is above the values of pressure.N max.
2)
Pressure sensor 1 is below the values of pressure.N min.
3)
There is no value for pressure sensor 1 pr1.N val.
4)
A communications failure has occurred between the Model 2000 and pressure sensor 1 pr1.N hart.
5)
Pressure sensor 1 is in a sensor generated alarm condition pr1.N hsts.
6)
The selected pressure units do not match the units indicated by pressure sensor 1 pr1.N unit.
7)
Pressure sensor 1 value is outside the deviation limit pr1.N dev.
8)
Pressure sensor 1 value is outside the average deviation limit pr1.N adev.
9)
Temperature sensor 1 is above the value of temp.N max.
10)
Temperature sensor 1 is below the value of temp.N min.
11)
There is no value for temperature sensor 1 te1.N val.
12)
A comms failure has occurred between the Model 2000 and temperature sensor 1 te1.N hart.
13)
Temperature sensor 1 is in a sensor generated alarm condition te1.N hsts.
14)
The selected temperature units do not match the units indicated by temperature sensor 1 te1.N unit.
15)
Temperature sensor 1 value is outside the deviation limit te1.N dev.
16)
Temperature sensor 1 value is outside the average deviation limit te1.N adev.
NOTE In all cases above 1) to 16) the numeric character could be 1, 2 or 3 depending upon the number of selected
multiple transmitters.
17)
The serial check pressure is above the values of pressureN max.
18)
The serial check pressure is below the values of pressureN min.
19)
The serial check temperature is above the value of tempN max.
20)
The serial check temperature is below the value of tempN min.
21)
The uncorrected flow rate is above the value of Hi q. for more than 1 minute.
22)
Base compressibility outside tolerance znN high or znN low.
23)
Model 2000 is in Calibrate Mode.
24)
Compressibility calculation cannot be completed Zn & Z will be set to 1.
25)
Communication with the gas chromatograph has failed.
26)
The gas chromatograph has a status alarm.
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