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2 Function description
The Flow Transmitter holds a number of internal functions and connections for external sig-
nals. The functions may be selected by keying in a set of configuration parameters. Calibra-
tion parameters may also be set. The data may be entered via a display/keyboard unit or via
P-NET.
The Flow Transmitter may be scaled to operate in any volumetric units, Litre, m
The flow rate may be selected to be displayed as volume unit/hour or /minute.
2.1
Flow measurement
The flow rate may be filtered to stabilize the readout of an unstable flow. Flow rates below 0.2
% of full scale may be ignored. This may be useful to avoid totalizing the volume during long
periods with no flow
(see configuration of function selector
Flow is measured in both directions. Flow in the direction of the arrow on the meter head will
be indicated as positive flow. Optionally, negative flow can be ignored and set to zero to pre-
vent downward volumetric totalisation
To compensate for the expansion of the liquid, the Flow Transmitter may be configured to
indicate a flow as if the liquid temperature was at 4 °C
2.1.1
Test mode
The Flow Transmitter may be switched into test mode. During installation and service, the
test mode may be used to simulate that liquid is flowing in the pipe system. All output signals,
pulse signals as well as the current signal, will act as if the liquid flow was present. This way,
all internal functions, external signals and cable connections may be checked
tion of function selector
2.2
Volume counter
The Flow Transmitter utilizes two independent totalizers, Volume1 and Volume2, which indi-
cate the measured volume since each were cleared. Each volume counter may be independ-
ently cleared or preset to a specific value
2.3
Automatic functions
A number of automatic functions are selectable in the Flow Transmitter. Only one of the func-
tions should be selected
each function).
2.3.1
Batch Control
The Flow Transmitter has a built-in batch control function, and can therefore easily be used to
control the dosing of a specified volume. The required volume is keyed into a setpoint regis-
ter. A digital input on the Flow Transmitter may be used to start the batch control. A digital
output, Output2, opens the dosing valve or starts a pump. When the setpoint volume is
Manual
(see configuration of function selector
Code2).
(see further details in the Volume1
(see configuration of function selector Code2
Flow Transmitter, PD 340
Code3).
Code3).
(see also T.C. Flow).
description).
about how to select
502 010 05
3
, Gallon etc.
(see configura-
11/55
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