Kessler-Ellis Products SUPERtrol II Addendum To Manual

Addendum to SUPERtrol II Manual For Manifold Controller

General Description-

The piping layout for a flow measurement manifold is shown in figure-1. Such flowmeter manifolds are used to increase
the flow measurement turn down range beyond that which can be satisfied by a single flowmeter.
The flow measurement manifold consists of:
High flow range flowmeter
Low flow range flowmeter
Bypass valve
Flow Measurement Instrument/Controller
Interconnecting piping
Ancillary temperature and pressure measurement devices (as needed)
The principle of operation is that the flow is always measured by the larger flowmeter. If the larger flowmeter indicates a
flow measurement below its measurement range, a bypass valve is closed diverting all the fluid flow through the smaller
flow meter where the measurement is made.
In the case where the bypass valve is open, most of the flow is diverted around the smaller flowmeter. The portion of the
fluid passing through the flowmeter may cause the meter to coast, but it will not be overranged.

Operation of the Flow Measurement Instrument/Controller using ST2-

A flowmeter manifold controller is a special flow instrument intended to accept inputs from two flowmeters, one larger and
one smaller, and which also controls the bypass valve. The instrument setup contains the calibration information for both
flowmeters as well as the manifold flow rate switch setpoint and hysteresis.
The instrument operation may be summarized as follows:
1. Measure the flow rate signal from the high range flowmeter
2. Decides if the flowrate is below the user specified low flow rate for the high range flowmeter:
If yes, close the bypass valve
If no, open the bypass valve
3. If the bypass valve is open display flowrate and totalization based on the high range flowmeter
If the bypass valve is closed, display flowrate and total based on the low range flowmeter
4. Analog Output, Relays, Pulse Output, etc... is based on which flowmeter is active at the time.
This special version of the ST2 has two analog, flow input channels.

Valve Specifications-

The valve should be a normally open energize to close valve of the same line size as the larger flowmeter.
To be effective as a bypass around the smaller flowmeter the valve should present a minimal pressure drop at the maxi-
mum flowrate. Full port valves perform best.

User Wiring-

1. Wire the analog input for the high range meter to terminal 2
2. Wire the analog input for the low range flowmeter to terminal 3
3. Wire the normally open control valve to Relay 1 terminals NO and COM
99607 03/03/10
Manifold Controller using the ST2