Dwyer Mark - Manual (Page 3)

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INTRODUCTION
The Proximity Controls Mark Series is a line of position indicators with a selection of various output options. Three
model styles make up the Mark Series to cover almost any application. A magnetic drive that completely seals the
switch compartment from the atmosphere for maximum leak protection is utilized in the Mark 1. The Mark 3 uses the
same magnetic drive of the Mark 1, but it can be used for multi-turn applications with 1 to 25 revolutions, such as gate
valves. A through shaft drive is incorporated in the Mark 4 making the unit a lower cost alternative to the Mark 1 for
applications that are not as demanding.
Standard models in the Mark Series have visual position indicators and are weatherproof, flameproof, and submersible.
A large variety of outputs are available to fit specific applications. There is a choice of 1 to 6 switch outputs of 13
varieties including inductive sensors, high temperature switches, gold contact switches, hermetically sealed switches,
and high current switches. Besides the switch outputs the Series offers potentiometer outputs, 4 to 20 mA transmitters
and HART
® communication.
The units are purchased for either direct drive applications, such as rotary valves, or lever drive applications, such as
linear valves. For the Mark 1, 3, and 4 this instruction manual starts with installation of the unit to the device being
monitored, and the set up of switch models. Separate instructions follow covering the potentiometer and transmitter set
up if your unit has those options.