ICS Triplex T8449 TMR Valve Position Monitor 24V

Product Overview

The ICS Triplex T8449 is a TMR valve monitor module for safety-critical actuation. It provides a triplicated 24 Vdc output to drive the valve and monitors position via the next input channel—either 4–20 mA from a sensor or a resistor network from limit switches. Built for SIL 3 applications.

Core Advantages

TMR Architecture

Fully triplicated with 2-out-of-3 voting. No single failure compromises valve action.

Flexible Feedback Input

Accepts 4–20 mA loops or voltage-divider networks. The resistor network must produce monotonic voltage steps across full valve travel—otherwise the module cannot determine position.

Specifications

Installation Tips

Analogue Sensor

Set zero/span for 4 mA (closed) and 20 mA (open). Ensure loop power is 24 Vdc.

Resistor Network

Use precision resistors (≤1%). Voltage steps must be monotonic across entire stroke—otherwise the module will flag a position error.

Hazardous Area

Follow ATEX/IECEx rules: use certified glands, separate IS from non-IS circuits, and observe max surface temperature.

Why Choose T8449?

Withstands vibration, temperature swings, and corrosion. TMR eliminates common-cause failures. Seamlessly integrates with ICS Triplex Trusted systems and third-party TSI platforms. Reduces external components while improving diagnostic coverage.

FAQs

Q1: How to check valve position via voltage?
A1: Measure voltage at the input. It should step up or down monotonically as switches actuate. Reversing steps means wiring error—module will reject it.

Q2: Can it replace an old single-channel monitor?
A2: Yes, but rewire for TMR: connect both output (drive) and input (feedback). The old monitor usually lacks feedback input—add the resistor network or transmitter.

Q3: What does HazLoc mean?
A3: Approved for Class I, Div. 2 / Zone 2. Global compliance for explosive atmospheres. Check certificate for gas group and T-class (e.g., II 3 G Ex nA IIC T4).