Electric Pneumatic Positioners EPP-Ex for Hazardous Processes

Electric Pneumatic Positioners EPP-Ex for Hazardous Processes — SPZ OJSC

Name: Electric Pneumatic Positioners EPP-Ex for Hazardous Processes
Brand: ЭПП-Ех
SKU: 168421
Availability: InStock

Brand: ЭПП-Ех

$90 - $300 USD

MOQ: 20 pieces

Key Features

Accuracy class: 1,0

dust and moisture protection: IP54

mass: 2.5 kg

Warranty period: 2 year

Supplier Information

SPZ OJSC

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Description

The ЭПП-Ех (EPP-Ex) electric-pneumatic positioners are manufactured by SPZ OJSC (Saransk Instrument Plant), a Russian industrial automation specialist whose products serve the oil refining, petrochemical, gas, and cryogenic industries. These positioners function as servo-system controllers, ensuring precise positional agreement between a command current signal and the actual stroke or rotation of pneumatic actuators—both single- and double-acting piston types (reciprocating and rotary) and membrane actuators.

The ЭПП-Ех variant carries explosion-proof certification to the marking 0Ex ia IIC T6 Ga X, providing the highest protection level Ga ('особовзрывобезопасный') with intrinsic safety 'ia' for hazardous gas atmospheres containing IIC-group gases, and is rated for use in explosion hazard zones 0, 1, and 2 per GOST IEC 60079-10-1. It complies with the Eurasian Customs Union technical regulations TR TS 012/2011 and TR TS 020/2011, and is designed to operate across an extended ambient temperature range of −50 °C to +60 °C with IP54 ingress protection.

Internally, the positioner comprises three functional blocks: an electronics block, an electro-pneumatic block (a discrete two-channel two-stage amplifier with a solenoid valve in the first stage and a single-diaphragm pneumatic amplifier in the second), and a feedback block based on a rotary potentiometer and single-stage gear train. Accuracy class is 1.0, with a basic error limit not exceeding ±1.0% of rated stroke.

Details & Equipment

Product & Dimensional Reference

ЭПП-Ех Unit

The assembled ЭПП-Ех electric-pneumatic positioner as supplied by SPZ OJSC, showing the explosion-proof enclosure with IP54 protection and cable entry gland.

Dimensional Drawing

Overall and mounting dimensions of the ЭПП / ЭПП-Ех positioner series, used for mechanical integration with piston or membrane pneumatic actuators.

Features

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Explosion-Proof Certification

Certified to 0Ex ia IIC T6 Ga X with intrinsic safety 'ia', suitable for explosion hazard zones 0, 1, and 2 containing IIC-group gases. Complies with TR TS 012/2011 and GOST 31610.0 / GOST 31610.11 (IEC 60079-0/11).

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Accuracy Class 1.0

Basic error does not exceed ±1.0% of rated stroke, delivering reliable precision in process control loops. Designed for both reciprocating (10–100 mm) and rotary (90°) pneumatic actuators.

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Wide Temperature Range

Operates from −50 °C to +60 °C (standard climate U1) and from −25 °C to +60 °C in tropical version (T2), with maximum surface temperature below 85 °C.

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IP54 Ingress Protection

The enclosure and cable entry provide IP54 protection against dust and water ingress per GOST 14254-80, while vibration resistance meets group N3 per GOST 12997-84.

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Corrosion-Resistant Version

The ЭПП-Ех-Ор variant tolerates up to 10 mg/m³ of hydrogen sulfide and/or sulfur dioxide continuously, and up to 100–200 mg/m³ during emergency conditions of 3–4 hours.

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Universal Input Signal

Accepts standard 4–20 mA, 0–20 mA, or 0–5 mA DC input signals; input impedance is 115±15 Ω (for 0–20/4–20 mA) or 580±30 Ω (for 0–5 mA), ensuring compatibility with most control systems.

Buyer Benefits

Highest explosion protection level Ga with intrinsic safety 'ia' allows installation directly in zone 0 hazardous areas, eliminating the need for purged enclosures
Extended operating temperature range of −50 °C to +60 °C supports outdoor and arctic process plant installations without additional heating
Corrosion-resistant -Ор variant allows operation in hydrogen sulphide and sour-gas process environments common in oil refining and gas processing
Compatibility with the BIP-1 passive intrinsic safety barrier simplifies integration into existing hazardous-area instrument loops
Two-year manufacturer warranty provides assurance of long-term reliability in continuous process control service
IP54 protection and vibration group N3 rating ensure durability under the mechanical and environmental stresses typical of heavy industrial installations
Supports single- and double-acting actuators across strokes from 10 to 100 mm and 90° rotary, covering a wide range of control valve body types

Applications

Automatic control and remote operation of process control valves in oil refineries and petrochemical complexes Gas processing plants and natural gas transmission stations, including installations in zones 0, 1, and 2 Cryogenic plants requiring reliable operation at temperatures down to −50 °C Sour-gas or hydrogen-sulphide-bearing process streams (with ЭПП-Ех-Ор corrosion-resistant variant) Reciprocating pneumatic actuators with standard strokes of 10, 16, 25, 40, 60, or 100 mm Quarter-turn rotary pneumatic actuators (90° rotation) for ball and butterfly valves Distributed control systems using 4–20 mA HART-compatible analogue signal infrastructure Offshore and outdoor installations subject to wide temperature swings, dust, and humidity

Source: official manufacturer website