Table of Contents
Advertisement
TM
PART 3 - INPUTS/OUTPUTS
General
The FSR1 is available in two configurations: the flow model and the energy model.
The flow model is equipped with a 4-20 mA output, two open collector outputs, a
rate frequency output, and RS-485 communications using the Modbus RTU command
set. The energy version has inputs for two 1,000 Ω RTD sensors in place of the rate
frequency and alarm outputs. This version allows the measurement of pipe input and
output temperatures for calculating energy usage calculations.
4-20 mA Output
The 4-20 mA output interfaces with most recording and logging systems by
transmitting an analog current signal that is proportional to system flow rate. The
4-20 mA output is internally powered (current sourcing) and can span negative to
positive flow/energy rates.
For AC powered units, the 4-20 mA output is driven from a +15 VDC source located
within the meter, isolated from earth ground connections. The AC powered model
accommodates loop loads up to 400 Ω. DC powered meters utilize the DC power
supply voltage to drive the current loop. The current loop is not isolated from DC
ground or power. Figure 3.1 shows graphically the allowable loads for various input
voltages. The combination of input voltage and loop load must stay within the
shaded area of Figure 3.1.
Supply Voltage - 7 VDC
0.02
1100
1000
900
800
700
600
500
400
300
200
100
10
12
14
16
Supply Voltage (VDC)
Figure 3.1 - Allowable Loop Resistance (DC Powered Units)
Z205739-0D
PAGE 14
Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Aerospond, Veris, and the Veris 'V' logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.
FSRxxxx SERIES
= Maximum Loop Resistance
Operate in the
Shaded Regions
18
20
22
24
26
©2013 Veris Industries
Loop
Resistance
Figure 3.2 - 4-20 mA Output
The 4-20 mA output signal is available between the 4-20 mA Out and Signal Gnd.
terminals as shown in Figure 3.2.
Control Outputs
Two independent open collector transistor outputs are included with the flow meter.
Each output can be configured for one of the following four functions:
Rate Alarm
Signal Strength Alarm
Totalizing/Totalizing Pulse
Errors
None
Both control outputs are rated for a maximum of 100 mA and 10 to 28 VDC. A pull-up
resistor can be added externally or an internal 10 kΩ pull-up resistor can be selected
using DIP switches on the power supply board.
28
1 2 3 4
O
N
Figure 3.3 - Switch Settings
Switch
S1
On
Control 1 pull-up;
Resistor IN circuit
Off
Control 1 pull-up;
Resistor OUT OF
circuit
Table 3.1 - DIP Switch Functions
INSTALLATION GUIDE
90-265 VAC
AC Neutral
Signal Ground
Signal Gnd.
Control 1
Control 2
Frequency Out
4-20 mA Out
Reset Total
Meter Power
S2
S3
Control 2 pull-up;
Frequency output
pull-up;
Resistor IN circuit
Resistor IN circuit
Control 2 pull-up;
Frequency output
pull-up;
Resistor OUT OF
circuit
Resistor OUT OF
circuit
7 VDC
Drop
S4
Square wave
output
Simulated turbine
output
05131
Advertisement
Table of Contents
