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Instruction Manual Series Mark Catalog Page More Info

12AD1 | 2 switches | SPDT snap | 15A @ 125/250/480 VAC | 1/8 hp @ 125 VAC | direct drive with stainless steel visual indicator | aluminum | painted white epoxy with SS trim. | Dwyer

2 switches, SPDT snap, 15A @ 125/250/480 VAC, 1/8 hp @ 125 VAC, direct drive with stainless steel visual indicator, aluminum, painted white epoxy with SS trim.

Brand: DwyerSKU: 12AD1

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Overview Details for 12AD1

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Series Mark Position Indicators/Switches/Transmitters

Flexible Design, Ideal for Corrosive Environments

The Proximity 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. 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 14 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, transmitters, and HART® Communications. 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 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.

Product Applications

Rotary valve actuators and dampers
Linear valve actuators and cylinders
Manual valves
Gear operators
Positioners

MARK 1
- Features a magnetic coupling that isolates the switch compartment, completely sealing the unit from the surrounding atmosphere for maximum hazard and leak protection.
- EZset cams on switch models provide simple set point adjustment.
- Flexible design allows multiple switches and transmitter options.
- Ideal for corrosive environments.
MARK 3
- Features a magnetic coupling that isolates the switch compartment, completely sealing the unit from the surrounding atmosphere for maximum hazard and leak protection.
- Multi-Turn models that can provide switch signals between 1 and 25 revolutions, and transmitter models for up to 10 revolutions without gear reduction.
- Flexible design allows multiple switches and transmitter options.
- Ideal for corrosive environments.
MARK 4
- Thru-Shaft design that features a 1" bearing for long life and o-rings to seal the switch compartment for hazard, corrosion, and leak protection.
- EZset cams on switch models provide simple set point adjustment.
- Flexible design allows multiple switches and transmitter options.
- A lower cost alternative to the Mark 1 Series for less demanding applications.

Features a magnetic coupling that isolates the switch compartment, completely sealing the unit from the surrounding atmosphere for maximum hazard and leak protection.
EZset cams on switch models provide simple set point adjustment.
Flexible design allows multiple switches and transmitter options.
Ideal for corrosive environments.

Features a magnetic coupling that isolates the switch compartment, completely sealing the unit from the surrounding atmosphere for maximum hazard and leak protection.
Multi-Turn models that can provide switch signals between 1 and 25 revolutions, and transmitter models for up to 10 revolutions without gear reduction.
Flexible design allows multiple switches and transmitter options.
Ideal for corrosive environments.

Thru-Shaft design that features a 1" bearing for long life and o-rings to seal the switch compartment for hazard, corrosion, and leak protection.
EZset cams on switch models provide simple set point adjustment.
Flexible design allows multiple switches and transmitter options.
A lower cost alternative to the Mark 1 Series for less demanding applications.

Specifications

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. Certified Ex d IIC T6 IP68 15 meters). ATEX Compliant: -B suffix; directive 2014/34/EU; KEMA 03 ATEX 2391; II 2 G Ex d IIC T6 for (-25/-40/-50°C = Tamb = 80°C optional wording) depending on output and switch type selected. -IS suffix directive 2014/34/EU; KEMA 03 ATEX 1392X; II 1 G Ex ia IIC T4. (Switch type C is not available with ATEX; Switch type B is not available with ATEX intrinsically safe; -IS suffix).IECEx Compliant: IE suffix; IECEx DEK II.0056X Ex d IIC T6 Gb for -25°C/-40°C/-50°C = Tamb = 70°C and T5 for -25°C/-40°C/-50°C = Tamb = 80°C. II suffix; IECEx DEK II.0061X II Ex ia IIC T4 Ga. Compliant per EN 60079-0:2007 EN 60079-11:2006 and EN 60079-26:2006.
: Switch Outputs (Mark 1; 3 and 4)
Temperature Limits: -58 to 176°F (-50 to 80°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 -50 to 80°C (-58 to 176°F) for switch type A; G; H; T; or M; -40 to 80°C (-40 to 176°F) for switch type O; R; S; V; or W; -25 to 80°C (-13 to 176°F) for switch type B; D; I; or AS interface; ATEX intrinsically safe; -IS suffix; rated -25 to 40°C (-13 to 104°F) for switch type D or I; -40 to 40°C (-40 to 104°F) for switch type R; V; or W or -50 to 40°C (-58 to 104°F) for switch type A; G or H.]
Switch Type: See Model Chart page.
Electrical Rating: See Model Chart page.
Set Point Adjustment: Mark 1 and 4: 5 to 360°.
: Potentiometer (Mark 1; 3 and 4)
Accuracy: ±0.5% of full span. Optional ±0.25% of full span.
Temperature Limits: -40 to 176°F (-40 to 80°C). [ATEX flameproof; -B suffix; rated -40 to 80°C (-40 to 176°F) for switch type A; G; M; O; R; S; T; V; or W; -25 to 80°C (-13 to 176°F) for switch type B; D; or I; ATEX intrinsically safe; -IS suffix; rated -25 to 40°C (-13 to 104°F) for switch type I; -40 to 40°C (-40 to 104°F) for switch type O; R; S; V; or W].
Power Rating: 1.5 watt maximum.
Output Signal: 1000Ω standard. Optional 2000; 5000; 10000; or 20000 Ω.
Zero and Span Adjustments: Span trim pot with 2000Ω adjustment. No zero adjustment.
Rotational Travel: Mark 1 and 4: Minimum 0°; Maximum 340°; Mark 3: 0 to 10 revolutions.
: Transmitter (Mark 1; 3 and 4)
Accuracy: ±0.5% of full span. Optional ±0.25% of full span.
Temperature Limits: -40 to 176°F (-40 to 80°C). [ATEX flameproof; -B suffix; rated -40 to 80°C (-40 to 176°F) for switch type A; G; M; O; R; S; T; V; or W; -25 to 80°C (-13 to 176°F) for switch type B; D; or I; ATEX intrinsically safe; -IS suffix; rated -25 to 40°C (-13 to 104°F) for switch type I; -40 to 40°C (-40 to 104°F) for switch type O; R; S; V; or W].
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 X 1.5 and M20 X 1.5 optional.
Rotational Travel: Mark 1 and 4: Minimum 50°; Maximum 300°; Mark 3: Minimum: 1.5 revolutions; Maximum: 8.5 revolutions.
: Transmitter w/HART® (Mark 1; 3 and 4)
Accuracy: ±0.25% of full span.
Temperature Limits: -40 to 176°F (-40 to 80°C). [ATEX flameproof; -B suffix; rated -40 to 80°C (-40 to 176°F) for switch type A; G; M; O; R; S; T; V; or W; -25 to 80°C (-13 to 176°F) for switch type B; D; or I].
Power Requirements: 8 to 30 VDC.
Current Consumption: 21 mA.
Output Signal: 4 to 20 mA.
HART® Receive Impedance: Rx = 500 kohm; Cx = 2500 pF.
Zero and Span Adjustments: Pushbuttons or HART® master for setting both. Mark 1 and 4: Span is adjustable from 0 to 330°; 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.
Rotational Travel: Mark 1 and 4: Maximum 330°; Mark 3: Minimum: 1.5 revolutions; Maximum: 8.5 revolutions.