Liquid Controls POD - Manual (Page 4)

General InformatIon
General Information
The Liquid Controls Pulse Output Device (POD) converts the rotary motion of the Liquid Controls Positive
Displacement Flowmeter into electronic pulses. This allows the meter to interface with a wide variety of electronic
monitoring devices and control equipment. The POD operates in standard and bidirectional flow applications.
The POD mounts directly to the front cover of any Liquid
Controls meter in place of the packing gland. The motion of
the meter’s blocking rotor is magnetically coupled through
a stainless steel wall to the electronics compartment of the
POD. This eliminates the dynamic seal of the packing gland
and isolates the electronics from the process fluid in the
meter.
Inside the electronics compartment, an optical shaft encoder converts the rotary motion into a high resolution, two-
channel, quadrature square wave. Both outputs are driven by field effect transistors (FETs) and switch from zero
volts in the “ON” state to the user’s power supply voltage in the “OFF” state. As supplied from the factory, there is a
2.2KΩ pull-up resistor on each output which can be removed from the circuit in the field to produce a true “open drain”
output. As open drain devices, the outputs can sink up to 100 mA in the “ON” state and sustain up to 30 VDC in the
“OFF” state.
The electronics compartment also serves as a conduit junction box. The POD has an O-Ring sealed, threaded cover.
The standard wire entrance is a ½-14 NPT female hub which accepts threaded conduit or a cable gland. A screw-
type, removable, terminal block on the circuit board facilitates wiring of the unit. With the wiring entrance sealed and
the cover in place, the housing has a weatherproof rating of NEMA 4X.
Pod models
There are five POD models available.
Pod1
Fork Drive with Buna-N O-Ring,
100 PPR Quad Pulser, 9 to 30VDC
Pod2
Fork Drive with PTFE O-Ring,
100 PPR Quad Pulser, 9 to 30VDC
Pod3
Blade Drive with Buna-N O-Ring,
100 PPR Quad Pulser, 9 to 30VDC
Pod4
Blade Drive with PTFE O-Ring,
100 PPR Quad Pulser, 9 to 30VDC
Before installation, check your shipment against the
packing list and ensure that no parts are missing. The
packing list is inside the red information packet along with
the Installation and Operation Manuals.
Check Each Shipment
ms series
Meter
Pulses/
Gallon/
Channel
single channel
Pulses/
litre/
Channel
single channel
Max outPut
- khz
@ max flow rate
(GPM)
MS-7 555.5 146.8 0.93
MS-15 205.8 54.4 0.69
MS-25 205.8 54.4 1.03
MS-30 74.2 19.6 0.43
MS-40 74.2 19.6 0.56
MS-75 25.5 6.7 0.30
MS-120 15.8 4.2 0.26
m & ma series
Meter
Pulses/
Gallon/
Channel
single channel
Pulses/
litre/
Channel
single channel
Max outPut - khz
@ max flow rate
(GPM)
MA-4 1,223.7 323.4 1.22
M-5, MA-5 (3:1) 407.9 107.8 0.41
M-5, MA-5 (1:1) 1,223.7 323.4 1.22
M-7, MA-7 555.5 146.8 0.93
M-10 555.5 146.8 1.39
M-15, MA-15 205.8 54.4 0.69
M-25 205.8 54.4 1.03
M-30 74.2 19.6 0.43
M-40 74.2 19.6 0.53
M-60 new style 39.8 10.5 0.40
M-60 old style 25.5 6.7 0.26
M-80 39.8 10.5 0.53
Output Signal Resolutions
Pod5
Fork Drive with Buna-N O-Ring,
100 PPR Quad Pulser, 5 to 24VDC
If using both channels and rising edge only, multiply the
pulses per unit and maximum kHz by a factor of two.
For LCR applications using both channels and the
rising and falling edge, multiply the pulses per unit and
maximum kHz by a factor of four.
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