Super Systems eFLO - Manual (Page 4)

eFlo Electronic Flow Meter Operations Manual
Super Systems Inc. Page 4 of 25
Introduction
The eFlo instrument is Super Systems Inc.’s electronic flow meter. eFlo
works by measuring the differential pressure (the difference in pressure
of a gas at two points) of a gas flowing through a specially designed
opening in the gas flow assembly. Based on properties of the flowed gas,
the differential pressure can then be used to calculate the flow rate of
the gas.
The eFlo features built-in high and low flow rate alarms and a flow rate
totalizer. The gas flow valve can be operated in manual mode or
automatic mode. Automatic mode allows the eFlo to use a flow rate
setpoint as a basis for adjusting the valve (and thus the gas flow) using a
built-in valve motor. The setpoint can be programmed manually by the
user or obtained by the instrument from a 4-20mA analog signal or
digital signal over RS485.
eFlo is part of SSi’s Flow Meter lineup, which also includes the FLO-
SCOPE ® manual flow meter.
This manual also covers the configuration and control software provided
with the eFlo meter: SSi FlowMeterView.
Safety Information
Observe the following safety requirements when configuring, operating,
servicing, or maintaining the eFlo instrumentation.
WARNING!
The eFlo instrument is NOT guaranteed to provide gas shutoff, nor is it designed to do so. For
reliable gas shutoff, incorporate a valve that provides positive gas shutoff. Ensure that all gas
flow equipment is in compliance with National Fire Protection Agency (NFPA) requirements,
including those found in NFPA 86. Failure to follow these requirements could result in
flammable gas leaks into the unit.
Ensure that the air and gas mixture ratio settings are within the specifications provided in this
manual. Exceeding specified values could result in hazardous conditions.
Specifications
The specifications for the eFlo instrument are as follows.
Power Required
24 VDC @ 400 mA
Accuracy 4%
Repeatability 2%
Turndown Ratio 6:1
Medium Temperature Limits -10°F to 150°F (-20°C to 65°C)
Figure 1 - eFlo 3-
dimensional angled
view