Elster Instromet 2000 Instruction Manual Download

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Model 2000 Flow Computer Instruction Manual

2.0

GENERAL

DESCRIPTION

Model 2000 issue 21

Page No

−

)

(

−

Where

: Relative density of gas at base conditions

Equation 1)

: Normal Density of gas in kg/m3

Equation 2)

airb

: Density of air at base conditions in kg/m3

DATA ENTRY

: Constant

DATA ENTRY or (See Equation 4)

: Constant

DATA ENTRY or (See Equation 3)

: Relative Density Transducer period in

Seconds

MEASURED

: Relative density of Calibration Gas x

DATA ENTRY

: Relative density of Calibration Gas y

DATA ENTRY

: Periodic Time of Calibration Gas x in

Seconds

DATA ENTRY

: Periodic Time of Calibration Gas y in

Seconds

DATA ENTRY

When this type of input is selected for the measurement of relative density this measurement will take priority over any value

received for relative density from a gas chromatograph.

2.4.10.

SWITCH STATUS INPUTS

Each Input board fitted to the Model 2000 has three switch status inputs available. These inputs can have a pre-defined
function as follows or they can be set to have no function and can be used purely for indication purposes for example to
indicate the current status of a contact or voltage input to the Model 2000 either On (contact closed) or Off (contact open).

The status of these inputs either On or Off is displayed on a separate page under the Line conditions, General option of the
main menu. The current status can also be read or printed via any communication port set up for that purpose. Ratings of the

inputs are identical to that for the Turbine switched inputs, a input de-bounce filter is fitted to these inputs. The possible pre-
set functions for each of the status inputs are as follows:-

•

No Function

This means that the input has not been assigned any pre set function its status will still be displayed and available for

other indication, but it has no actual function.

•

Bi-Dir Turbine

In a Model 2000 set up for Pulse counting inputs from a Turbine Meter. The Status input is used to indicate flow
direction to the Model 2000 if the meter used is capable of operating in both directions.

•

In a Model 2000 set up for Pulse counting. The Status input is used to enable or disable the positive pulse count.

•

Enable –

In a Model 2000 set up for Pulse counting. The Status input is used to enable or disable the negative pulse count.

•

This function uses the Status input as a local or remote Print operation input. If it is enabled then a second menu list

appears which allows selection of a particular print job (as set up on the Print Job page) to be printed.

•

Sum

This function uses the Status input to Select Streams to be Summated from all the individual streams in a unit. If it is

enabled then a menu list appears which allows selection of the streams to be summated under control of that Status
input. If this function is enabled then the Sum function on the Station Values set-up page is disabled.

•

Ensonic Reset

This function uses the Status input to initiate an Ensonic Reset if such a gas measuring deice (Instromet Ensonic) is

connected to the gas chromatograph port of the Model 2000.

•

Ensonic Calibration

This function uses the Status input to initiate an Ensonic Calibration if such a gas measuring deice (Instromet Ensonic)
is connected to the gas chromatograph port of the Model 2000.

•

Security Switch 1

This function uses the Status input to replace Mode switch 1 when operating as a Security Switch On/Off. When this
option is selected the internal Mode Switch 1 has no function.

•

Security Switch 2