Installation
For best results, the meters may be installed in any position as long as proper piping
installation requirements are observed. This includes sufficient support of adjacent
piping to minimize the system’s inherent vibration. Unions of the same pipe size and
full port isolation ball valves may be installed for ease of removal and servicing of
equipment, if necessary. Meters should be placed in horizontal, slightly ascending runs
or vertical runs to prevent trapped air from accumulating in the meter. Furthermore,
the meters should not be placed at the highest point in the piping. The piping system
should be filled slowly to prevent water hammer from damaging the flow sensor.
Please note that reverse flow can also damage the flow sensor.
In order to achieve the stated accuracy, a straight pipe run of 10 pipe-diameters
(minimum) is required upstream of the meter, as well as 5 pipe-diameters downstream.
Isolation ball valves, when used, should be in the full open position. Throttling valves
should always be placed downstream of the meter. A minimum straight run of 50 pipe-
diameters is required between an upstream valve and the flowmeter.
If PTFE tape or pipe sealant is used, the user must ensure that no loose parts become
wrapped around the bluff or the flow sensor when flow starts.
Use of diaphragm or piston pumps affects the meter’s performance unless they are
installed with a properly sized pulsation dampener and pressure control. The piping
system must create some back pressure on the meter to allow vortex formation and to
prevent cavitation, especially at full flow. Minimum required back pressure is 10 psig
at maximum flow and at 70°F (21°C). Higher back pressures are required at elevated
temperatures and occasional surges to 125% of maximum flow.
In rare situations, the user may notice an intermittent flow display that drops off while
the flow is held steady. In this case, please contact Dwyer Instruments to discuss the
back pressure requirements.
Electrical Connections
Totalizer with pulse output
The unit shall be supplied by a Class 2 or SELV (safety extra-low
voltage) source in accordance with CSA C22.4 No. 61010-1-012.
Failure to do so may result in equipment damage.
CAUTION
1
2
3
4
5
4-20 mA FLOW SIGNAL OUT
+24 VDC SUPPLY
FLOW RELAY CONTACT
FLOW RELAY CONTACT
SUPPLY GROUND
WHITE
BROWN
GRAY
BLACK
BLUE
LOAD
PIN CONFIGURATION:
1: +24 VDC POWER SUPPLY
2: 4-20 mA FLOW SIGNAL OUT
3: POWER SUPPLY GROUND
4: FLOW RELAY CONTACT
5: FLOW RELAY CONTACT
CP
[FLOW ONLY]
WIRING
1
2
3
4
5
4-20 mA FLOW SIGNAL OUT
+24 VDC SUPPLY
FLOW SIGNAL PULSE OUTPUT
SUPPLY GROUND (REDUNDANT)
SUPPLY GROUND
WHITE
BROWN
GRAY
BLACK
BLUE
CONFIGURATION:
1: +24 VDC POWER SUPPLY
2: NOT USED
3: SUPPLY GROUND
4: SUPPLY GROUND
5: FLOW SIGNAL PULSE OUTPUT
NOTE: THERE IS AN INTERNAL 10K Ω PULL-UP
RESISTOR ON THE PULSE OUTPUT LINE (PIN 5).
CX2 wire transmitter
PIN connector standard wiring
CT (flow and temperatue) wiring
CT wiring
1
3
4
BROWN = +24 VDC LOOP POWER
NOT USED
BLUE = DC LOOP GROUND
1
2
3
4
5
4-20 mA FLOW SIGNAL OUT
+24 VDC SUPPLY
FLOW RELAY CONTACT
FLOW RELAY CONTACT
SUPPLY GROUND
WHITE
BROWN
GRAY
BLACK
BLUE
TURN FLOW RELAY CONTACT FROM A
SWITCH TO A PULSE OUT BY EXTERNALLY
CONECTING A 2K - 10K Ω PULL UP RESISTOR
FROM POWER SUPPLY TO ONE FLOW RELAY
CONTACT AND CONNECTING THE OTHER
FLOW RELAY CONTAC TO SUPPLY GROUND.
CONFIGURATION:
1: +24 VDC POWER SUPPLY
2: 4-20 mA FLOW SIGNAL OUT
3: SUPPLY GROUND
4: FLOW RELAY CONTACT
5: FLOW RELAY CONTACT
*
1
2
3
4
8
5
6
7
4-20 mA FLOW SIGNAL OUT
+24 VDC SUPPLY
TEMP RELAY CONTACT
4-20 mA TEMP SIGNAL OUT
TEMP RELAY CONTACT
FLOW RELAY CONTACT
FLOW RELAY CONTACT
SUPPLY GROUND
BROWN
WHITE
BLUE
PINK
RED
GRAY
YELLOW
GREEN
LOAD
PIN CONFIGURATION:
1: +24 VDC POWER SUPPLY
2: 4-20 mA FLOW SIGNAL OUT
3: POWER SUPPLY GROUND
4: FLOW RELAY CONTACT
5: FLOW RELAY CONTACT
6: 4-20 mA TEMP SIGNAL OUT
7: TEMP RELAY CONTACT
8: TEMP RELAY CONTACT
1
2
3
4
8
5
6
7
4-20 mA FLOW SIGNAL OUT
+24 VDC SUPPLY
TEMP RELAY CONTACT
4-20 mA TEMP SIGNAL OUT
TEMP RELAY CONTACT
FLOW RELAY CONTACT
FLOW RELAY CONTACT
SUPPLY GROUND
BROWN
WHITE
BLUE
PINK
RED
GRAY
YELLOW
GREEN