The Proximity Mark Series is a line of position indicators with a selection of various output options. Four model styles make up the Mark series to cover almost any application. Standard models in the Mark Series have visual position indicators and are weatherproof, explosion-proof, and submersible. A large variety of outputs are available to fit specific applications. There is a choice of 1 to 6 switch outputs of 16 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 and 4 to 20 mA transmitters. The units are purchased for either direct drive applications, such as rotary valves, or lever drive applications, such as linear valves. Adjustable visual indicator is standard on direct drive units that displays OPEN/CLOSED status and degrees.

A patented 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. Also featured in the Mark 6 is a patented magnetic design that completely seals the switch cavity. The Mark 6 offers hermetically sealed reed switches that are perfect for high cycle rate applications and low current uses such as computer and PLC control systems.

SPECIFICATIONS
General
Product Rating: Weatherproof and flameproof. NEMA 1, 2, 3, 3R, 3S, 4, 4X, 6, 7, 9, 12, 13. UL rated: Class I, Div. 1 & 2, Groups B, C, D (some units available for Group A, consult factory); Class II, Div. 1 & 2, Groups E, F, and G. CSA rated: Class I, Div. 1 & 2, Groups A, B, C, D; Class II, Div. 1 & 2, Groups E, F, and G; Submersible to 50 feet. SAA rated: -S suffix, Certified Ex d IIC T6 IP68 15 meters). ATEX Compliant: -B suffix, directive 94/9/EC, KEMA 03 ATEX 2391, II 2 G EEx d IIC T6 for -20°C = Tamb = 70°C and T5 for -20°C = Tamb = 80°C optional wording. -IS suffix directive 94/9/EC, KEMA 03 ATEX 1392X, II 1 G EEx ia IIC T4. (Switch type C is not available with ATEX; Switch type B is not available with ATEX intrinsically safe, -IS suffix).
Electrical Connections: Screw terminal. Optional factory sealed leads that are 36" (914.4 mm) of 18 AWG.
Conduit Connection: 3/4" female NPT standard. Optional one or two 1/2" female NPT. M25 and M20 optional (standard on SAA certified products).
Mounting Orientation: Not position sensitive.
Weight: 4 to 6 lb (1.5 to 3.0 kg).
Operational Life: Over 10,000,000 cycles.
Maximum Altitude: 2000 meters.
Patents: US 4214133, 4647733, 4831350, 5357067, and other patents pending.

Mark 1, 3, 4 and 6 with Switch Outputs
Temperature Limits: -65 to 180°F (-54 to 82°C). Switch Type C rated to 350°F (176°C) for 600 hours, Switch Type T rated to 250°F (121°C) continuous [ATEX flameproof, -B suffix, rated -20 to 80°C (-4 to 176°F); ATEX intrinsically safe, -IS suffix, rated -20 to 40°C (-4 to 104°F)].
Switch Type: See Complete Model Chart on "Ordering" Page.
Electrical Rating: See Complete Model Chart on "Ordering" Page.
Set Point Adjustment: Mark 1 and 4: 5 to 360°; Mark 3: 1 to 25 revolutions; Mark 6: 45 to 180°.

Mark 1, 3 and 4 with Potentiometer
Accuracy: ±0.5% of full span. Optional ±0.25% of full span.
Temperature Limits: -40 to 180°F (-40 to 82°C). [ATEX flameproof, -B suffix, rated -20 to 80°C (-4 to 176°F); ATEX intrinsically safe, -IS suffix, rated -20 to 40°C (-4 to 104°F)].
Power Rating: 1.5 watt maximum.
Output Signal: 1000 ohm standard. Optional 2000, 5000, 10000, or 20000 ohms.
Zero and Span Adjustments: Span turn pot with 2000 ohm adjustment. No zero adjustment.
Rotational Travel: Mark 1 and 4: Minimum 0°, Maximum 340°; Mark 3: 0 to 8.5 revolutions.

Mark 1, 3 and 4 with Transmitter
Accuracy: ±0.5% of full span. Optional ±0.25% of full span.
Temperature Limits: -40 to 180°F (-40 to 82°C). [ATEX flameproof, -B suffix, rated -20 to 80°C (-4 to 176°F); ATEX intrinsically safe, -IS suffix, rated -20 to 40°C (-4 to 104°F)].
Power Requirements: 5 to 30 VDC.
Current Consumption: 50 mA.
Output Signal: 4 to 20 mA.
Zero and Span Adjustments: Trim pots for adjusting both. Mark 1 and 4: Span is adjustable from 50 to 300°; Mark 3: Span is adjustable from 1.5 to 8.5 revolutions.
Conduit Connection: 3/4" female NPT standard. Optional one or two 1/2" female NPT. M25 and M20 optional (standard on SAA models).
Rotational Travel: Mark 1 and 4: Minimum 50°, Maximum 300°; Mark 3: Minimum: 1.5 revolutions, Maximum: 8.5 revolutions.

FEATURES

MARK 1

MARK 3