Model 2000 Flow Computer Instruction Manual
2.0 GENERAL DESCRIPTION
Model 2000 issue 21 Page No
44
To interface with the hazardous area where intrinsically safe transmitters are used a digital safety barrier must be used a
typical barrier is a Measurement Technology Ltd barrier Model MTL3046B or MTL 5042.
2.4.11.4. ANALOGUE TRANSMITTER STATION PRESSURE AND TEMPERATURE INPUTS
As an alternative to the HART transmitter inputs described in paragraph 2.5.10.3 the Model 2000 can also accept current
input signals for Station Pressure and Station Temperature which are fed into an single sided amplifier and having a
response time of approximately 470ms.
Input current: 4mA. to 20mA.
Input resistance: 100Ω
To interface with the hazardous area where intrinsically safe transmitters are used a safety barrier must be used.
2.4.11.5. STATION PRESSURE & TEMPERATURE SENSOR SCALING
The Model 2000 can also be configured so that each of the connected Station Pressure or Temperature Sensors can be
scaled using a simple equation as follows:-
)TxP1.R(1.OffsetScaleP
11
×+=
Where
P1 Scale : Pressure P1Scale is the used
R.1 : Pressure P1 Range Scaling Factor
Offset.1 : Pressure P1 Offset Scaling Factor
P1 Tx : Pressure P1 Actual measured
Identical Equations also apply for all Station Pressure and Temperature Sensor inputs.
2.4.12. SMART INDEX AND ENCODER INPUT
The Model 2000 flow computer can be configured to receive a serial communication input from an Instromet SMART Index ,
or Elster ENCODER for Turbine meters. The input uses one of the communication ports configured for that purpose using
the NAMUR serial communication protocol.
When used in this way the Model 2000 displays the received information, it does not use it for any flow calculation purposes.
The Model 2000 will read and display the following Parameters from the attached device:-
Meaning
a<US> start character a, data frame identifier “meter-readout”
zzzzzzzzzzzzzz<US> meter readout max. 14 digits in ASCII Decimal, no suppression of leading
zeros
ww<US> indication of the dec. pt. of meter-readout max. 2 digits optional + or – and
power of 10 in ASCII-Decimal Note 0, +0, -0 are equivalent and are all
valid.
eee<US> physical unit of meter readout, max. 3 characters as text e.g. m3
s<FS> Device Status 1 byte 0x30 to 0x3F where 0x30 means no fault
b<US> start character b, data frame identifier “identification”
manufacturer code must be 3 capital letters e.g. INS
TTTTTT<US> device type or meter class max. 6 characters as text e.g. G1600
SSSSSSSSS<US> serial number of the meter max. 9 characters as text e.g. 123456789
JJJJ<US>
year of manufacture of meter must be 4 digits in ASCII Decimal e.g. 2003
VVVV<FS> software version number of Smart Index , max 4 characters as text
<US> Unit separator
<FS> File separator
For more detailed information relating to the setting up and configuration of the Instromet SMART Index, or Elster ENCODER
see the operating instruction manuals for that device.
2.4.13. ANALOGUE INPUT FOR GRAB SAMPLER CAN LEVEL INDICATION
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