Emerson 191736-01 Rotary Encoder 5VDC Flange Mount

Emerson 191736-01 Rotary Encoder for Valve Position Feedback

Product Introduction

The Emerson 191736-01 rotary encoder delivers reliable end-of-travel position feedback for industrial valves. This device detects both open and closed positions of the valve stem. As the stem moves, cams on the signaling box plunger activate internal contacts. These contacts then send a clear electrical signal indicating that the valve has reached its mechanical limit.

Additionally, the 191736-01 supports two contact types. You can choose mechanical contacts for simple on-off signals. Alternatively, use inductive contacts (PNP/NPN) for solid-state switching. Therefore, this encoder fits a wide range of control systems, from basic relay logic to modern PLC inputs.

Technical Specifications

Power and electrical characteristics of the Emerson 191736-01 are listed below.

• Supply Voltage: 5 VDC

• Mounting Type: Flange mount

• Connection: 10-pin interface

• Compatible Systems: SCS-2, SDC50-2-7

Mechanical Contacts:

• Voltage rating: 24 V AC/DC

• Breaking capacity: 0.5 A (max. 1 A)

Inductive Contacts (PNP/NPN):

• Voltage range: 10 to 30 V DC

• Power rating max: 0.95 W

• Switching current: 100 mA

Furthermore, the 191736-01 uses a terminal block with four positions for field wiring. Stranded wire sizes from 0.14 mm² (25 AWG) up to 2.5 mm² (14 AWG) are accepted. The recommended wire strip length is 5 mm (0.2 inches). A single M16x1.5 cable gland accepts cables between 4 and 8 mm in diameter.

Environmental and Mechanical Construction

The Emerson 191736-01 is built to survive harsh industrial conditions. Its degree of protection reaches IP66 per EN 60529. This rating means the unit is dust-tight and protected against strong water jets.

Ambient Temperature Ranges:

• Mechanical contacts: -20°C to +80°C (-4°F to 176°F)

• Inductive contacts (PNP/NPN): -20°C to +70°C (-4°F to 158°F)

Vibration Resistance: Max. 1 g per EN 60068-2-6

Materials Used:

• Body: Glass fiber filled PA

• Cover: PA (transparent) or aluminum

• Valve adaptor: Brass or stainless steel

• Stem and cams: Stainless steel and PEEK

• Guiding and bearing: POM

• Seals and interface gasket: NBR

• Cable gland: PA + NBR

Consequently, the 191736-01 resists corrosion, UV exposure, and moderate chemical splashes. You can install it outdoors or in washdown environments without concern.

Certifications and Approvals

The Emerson 191736-01 meets several important industry standards.

• RoHS compliance – Restriction of Hazardous Substances

• REACH compliant – Registration, Evaluation, Authorization of Chemicals

• SIL2 Capable – Certified per IEC 61508:2010 for functional safety applications

Specifically, the SIL2 capability allows you to use this encoder in safety-related systems up to Safety Integrity Level 2. Always verify the complete safety loop calculation for your specific application.

Frequently Asked Questions (FAQ)

1. Is the 191736-01 compatible with standard PLC digital inputs?
Yes, the inductive contact version (PNP/NPN) connects directly to 10-30 V DC PLC inputs. The mechanical contact version requires a separate 24 V AC/DC power source. For 5 V logic, use an external pull-up resistor.

2. Can I replace only the contacts without changing the whole encoder?
Yes, the Emerson 191736-01 allows contact block replacement. You can swap mechanical contacts for inductive types or vice versa. Always disconnect power before opening the enclosure.

3. What is the difference between SCS-2 and SDC50-2-7 compatibility?
Both systems use the same cam and plunger mechanism. However, the 191736-01 includes specific adaptors for each valve stem type. Verify your valve model before ordering. Emerson provides adaptor kits separately.

4. Does the IP66 rating remain valid with the transparent PA cover?
Yes, the transparent PA cover maintains the IP66 rating when properly sealed. Regularly inspect the cover gasket for damage. Do not overtighten the cover screws, as this may crack the plastic.

5. How do I set the end-of-travel positions correctly?
Loosen the cam set screws slightly. Manually rotate the valve stem to the fully closed position. Then rotate the closest cam until its plunger clicks. Tighten the set screw. Repeat for the open position. Finally, verify both signals with a multimeter before returning the valve to service.