IP87 Digital Positioner

The IP87 digital electro-pneumatic valve positioner works with a pneumatic actuator to set valve position precisely according to the control signal, minimizing the effects of friction and other factors that would otherwise degrade valve performance. It uses a 4–20 mA input and output for both the control and feedback signal.

Precise and simple describes the IP87 well. It’s built for processes with high control demands that don’t require communication with a process control system or valve diagnostics.

• Non-contact sensor system for accurate, reliable position tracking
• Automated initialization and autotuning calibrate the unit to the start-up
• Intuitive operation with on-screen— menu navigation and selections executed via toggle button
• Power failsafe storage retains all parameters through a power failure
• UV-resistant housing for reliable outdoor use

The IP87 complies with a wide array of accident-prevention regulations as well as the DIN VDE standards set by the German Institute for Standardization and the Association for Electrical, Electronic & Information Technologies.

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Configuration and Operation

The IP87 consists of the following components:

• Magnetoresistive sensor
• Analog I/P converter with a downstream air capacity booster
• Electronics unit with a microcontroller

These components work together to monitor valve operation. The positioner includes a tight-closing function that fully vents and/or fills the pneumatic actuator when the reference variable falls below 1% or rises above 99%.

The positioner operates by default in an open direction of control—meaning pressure failure closes the valve—but this can be changed to a closed configuration, in which pressure failure opens the valve instead. The valve can also incorporate two optional closing directions: spindle up or spindle down.

Accessories

Available accessories for the IP87 include:

• Complete adaptation parts, including pneumatic connecting parts for replacement or retrofitting
• A pneumatics connection kit with two L-shaped plug connections, a straight plug connection, and a polyamide tube
• A manometer mounting kit with two manometers

Service/Maintenance

The IP87 doesn’t require regular maintenance, but we recommend an annual check to confirm it’s functioning properly.

Additional specs of the IP87 include:

• Medium: Compressed air according to ISO 8573-1, with Class-4 particle content and Class-3 oil content
• Stroke: 12–66 mm
• Air consumption: <0.1 mn³/h to 6 bar
• Housing/cover: Polyphthalamide (PPA)/polycarbonate (PC)
• Permissible ambient temperature: −20 to +80°C
• Weight: ~0.7 kg
• Outdoor use: Can operate in low- and high-pollutant areas