Pulse Output Device
6
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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.
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.
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 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
These are the available POD models:
·
POD1 – Fork Drive with Buna-N O-Ring, 100 PPR Quad Pulser, 9 to 30VDC
