Elster Instromet 2000, Инструкция по эксплуатации

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Model 2000 Flow Computer Instruction Manual
2.0 GENERAL DESCRIPTION
Model 2000 issue 21 Page No
54
2.8. PULSED OUTPUTS FOR CONTROL FUNCTIONS
Any of the twelve transistor pulse outputs that are available from each fitted Output Board can be selected for the following
control type functions:-
2.8.1. FLOW DIRECTION OUTPUT
The required output can be set to indicate Flow Direction it will indicate the flow direction as determined by the sign of the
flow rate parameter and the Invert function e.g.(On) for + direction or (Off) for – direction.
2.8.2. FIXED OUTPUT
The required output can be set to be Fixed i.e. it is set permanently to be Logic 1 (On) or Logic 0 (Off)
2.8.3. DIGITAL INPUT STATUS OUTPUT
The required output can be set to indicate the current status of any of the Digital Switched Inputs 1 , 2 or 3 (on each fitted
Input Board) Logic 1 Input is (On) or Logic 0 Input is (Off). The Invert function will reverse these outputs.
2.8.4. VALVE CONTROL OUTPUT
The required output can be set to control the Open and Close Functions of one or two external Valves under remote control
using a Modbus serial communication port. The Valve Control Output will be energises for a preset time interval of between
1 and 65535 seconds as set using the operating software. The Invert function will reverse these outputs.
If the Value 255 is written then the Output is set ON permanently.
If the Value 254 is written then the Output is set OFF permanently.
2.8.5. FUNCTION OUTPUT
A function output can be used to output the results of an internal module from the Model 2000. This can be from a valve
module, a lubrication module or any other module.
2.8.6. GRAB SAMPLER OUTPUT SIGNALS
The FC2000 can provide outputs to be used with two identical sized sample cells. The operation of these grab samplers will
be controlled by the FC2000 flow computer, with the possibility of allowing remote monitoring, start-, stop- and reset-
functionality. The FC2000 flow computer shall collect representative samples simultaneously or individual for both samplers.
The sample frequency is calculated via operator entered set points so that it is proportional to the flow rate. Continuous
indication of the current sample volume collected shall be provided, an alarm will be indicated when the cylinder level
reached the Cylinder Alarm level which is set to a default value of 80% full.
2.8.6.1. GRAB SAMPLER OUTPUT OPERATION
Start/Stop Sampling
Both grab sampler systems can be started or stopped individually or at the same time. This can either be done manually via
the FC2000 display in “EDIT” mode or automatically from a remote system. On start-up of the FC2000 flow computer the
sampling system will be stopped on both samplers, and must be started manually by the operator.
Sampling will be disabled automatically under the following conditions:
The flow rate is below an operator entered limit.(low flow cut-off)
The sample can is full.
When the entered production period has expired.
If sampling is stopped manually by the operator it will not re-start automatically, but must be started manually.
2.8.6.1.1. CONFIGURATION SETTINGS
The following fixed values shall be entered by the operator.
Cylinder size (ml or cc)
Cylinder Full alarm (%)
Cylinder Alarm (%)
Grab Size (ml or cc)
Grab output Pulse Duration (seconds)
Deviation between calculated and measured cylinder level (%)
Large Max sampler speed (grabs/tonnes)
Large Expected Production quantity in (tonnes)
Production period (days) or
Start/Stop date
Automatically resume sampling after low flow cut off.