Omega Engineering PHTX-11 manual General description, Signal that may be transmitted, Loop Any

PART I - INTRODUCTION

General description

The OMEGAmModel PHTX-11 is a 2-wire pH/ORP transmitter featuring input-out- put isolation, wide power supply range, high input impedance, LCD digital display,

modular construction, programmable span selection, manual/automatic temperature compensation and a NEMA 4X housing as a standard enclosure.

The Model PHTX-11 accepts as its input any						pH probe via a BNC co-axial connector.
It transforms the probe signal to a 4 to 20mA D.C.						signal that may be transmitted
over 2-wires to a control location.					The signal wires also provide power to the
transmitter.			The output is monitored by placing a load resistor in the current
loop.		Any	D-C. power supply from 12 to 80 volts may be used.					The input is iso-
lated from the output to prevent accidental damage of sensitive data gathering
equipment at the control location.
The	pH	level is constantly displayed on a 3% digit L.C.D.						A push button switch
allows the display to indicate the					mA output on command.
The user can change the range of output signal by utilizing jumpers on one of
the circuit boards and adjusting the zero and span pots.								The 4 to 20mA output
can be for the full 0 to 14				pH	range or as little as 1		pH	unit, for example 6
to	7 pH.

PART II - INSTALLATION

1.Unpacking

After unpacking, remove instrument cover, remove shipping ties or clamp. Note any special instructions included in the package.

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2.Mounting

2.0Before mounting the signal conditioner enclosure, remove the assembled

circuit boards by removing the two phillips head screws in the bottom of the enclosure.

2.1 Conduit Mounting	- the unit can be supported by ridged conduit using
the appropriate size hubs in the ends of the box (ie:		l/2" or 3/4").

Cut the threaded male portion to allow room for the circuit board.

2.2 Flat Surface - mounting to a flat surface requires the heavy PVC mounting

feet be attached to the box. The surface should be drilled and the feet mounted with #lO screws and nuts.

2.3Pipe Mounting - attachment to a round pipe requires "U" bolts and nuts. The "U" bolts should bolt to the heavy PVC mounting feet.

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