Trolex TX9131-2-6-7-9 Programmable Trip Amplifier

Cost-Effective Predictive Maintenance

The Trolex TX9131 Programmable Trip Amplifier offers a solution for predictive maintenance with its dual set point relays and optional analogue repeater output signal. It is compatible with standard sensor signals including 0-4...2V, 4...20mA, and PT100. The unit features a microprocessor-based, menu-operated mode selection for all functions, allowing for easy configuration of scale, units, offset, set points, time delays, relay phase, latching, and hysteresis. An LCD display provides information on input signal status and operating modes. The amplifier offers application flexibility with various mounting formats, including front of panel, DIN rail, or 19" rack mounting. It is also certified intrinsically for underground mining.

Choice of Input Signals

TX9131 Current Signals

Supports 2-wire or 3-wire process signals. The fully floating differential input allows multiple units to be connected in series on the same loop, providing high noise immunity. Available signals include 0-20mA and 4-20mA.

TX9132 Voltage Signals

Features a differential input that enables long signal lines with minimal signal loss. Supports 0.4-2V signals.

TX9134 PT100 Input

This model is discontinued. It was designed for platinum resistance temperature sensors (DIN43760, BS1904) and supported ranges of -50°C to 200°C and -50°C to 400°C.

TX9136 Bridge Input

Designed for balanced four arm bridge input, suitable for bridge measuring circuits, pressure sensors, and strain gauges. Supports ranges of 15mV to 50mV.

TX9137 AC Input

Accepts AC input signals from load cells, AC generators, accelerometers, and velocity sensors, or power measurement systems. Supports AC Peak (10Hz-10KHz, 10V pk/pk) and AC RMS (10Hz-10KHz, 10V pk/pk).

Programmable Output Signals

The amplifier offers two independent output relays with configurable set point alarm levels. Relay functions include AUTO, LATCH, and IMPULSE, with hysteresis dead band control. It supports rising/falling alarm relay functions, power-on delay run-up periods, output delay timers, and input update periods. Permanent memory data retention is also included.

An analogue repeater output signal can be substituted for one of the output contacts, providing options for 4-20mA or 0.4-2V repeater signals for communication with data systems.

Information Display

The unit features a high contrast dot-matrix LCD that displays the signal bar graph, engineering units, set point status LEDs, and signal tendency arrows (rising/falling). It also shows zero and span information.

Information Security

All essential information can be protected by a user security code, allowing access to day-to-day functions while securing critical settings.

Signal Fault Alarm

The device includes line and input signal monitoring to detect system failures. If an open or short circuit signal line is detected, both output relays will de-energize, and a HIGH or LOW SIGNAL ERROR will be displayed.

Technical Details

• Display Accuracy: ±0.5% (Analogue Channels)
• Set Point Accuracy: ±0.5%
• Ambient Temperature Limits: -10°C to 50°C
• Electrical Connections: 4mm barrier/clamp terminals
• Housing Material: ABS
• Nett Weight: 300gms
• Environmental Protection: IP55 (IP65 Panel Seal)
• Information Display: High contrast dot-matrix LCD
• Mounting: DIN Rail EN 50022, 19" Rack or Front of Panel
• Operation: Microprocessor controlled menu operation, with non-data retention
• Set Point Adjustment: 0-99%
• Hysteresis Adjustment: 0-99%
• Power ON Delay Adjustment: 0-255 seconds
• Output Delay Adjustment: 0-25 seconds
• Engineering Units Menu: User selectable units including mV, V, mA, °C, °F, g, kg, mbar, bar, Pa, kPa, PSI, %, ppm, %RH, mm, m, m/s, mm/s, m³/s, ft, ins, ft/sec, rpm, pps, Hz, kHz, g/m³ (ASCII code user entry)
• Input Signal Averaging Period Adjustment: 0-250 seconds
• Input Signal Failure Alarm: Open or Short Circuit signal line will de-energise both output relays and display HIGH or LOW SIGNAL ERROR
• Certification: Group I - Intrinsically Safe "ia"

Dimensions

DIN Rail Mounting: Height: 110mm, Width: 66mm, Depth: 61mm

19" Rack Mounting (TX9139 Only): Height: 110mm, Width: 74mm, Depth: 61mm

Note: Modules must be housed in a protective metal enclosure to comply with I.S. requirements.

Electrical Details

• Supply Voltage: 7.5V dc - 16.5V dc
• Supply Current: 60mA at 12V with both relays energized
• Output Relays: 2 independent encapsulated reed relays
• Contact Rating: 200V, 0.25mA, 3W absolute maximum
• Contact Format: NORMALLY OPEN or NORMALLY CLOSED (user selectable)
• Repeater Output Signals: 4...20mA analogue, 0.4...2V analogue
• Ex Certification: Intrinsically Safe "ia"

Connections for Analogue Inputs

Diagrams illustrating connections for TX9131, TX9132, TX9134, TX9136, and TX9137 models, including analogue and repeater output connections.

Connections for Interposing Relay

Diagram illustrating connections for the TX9139 model, showing connections for Relay 1, Relay 2, and Relay 3.

Housings for Programmable Trip Amplifiers

Environmentally protected housings are available for the DIN rail mounting version. These feature a robust stainless steel enclosure with a stainless steel front cover and a polycarbonate viewing window. They are environmentally protected to IP66 and offer ample M20 cable entries. A mounting rail for TX9130 modules is also available.

Dimensions: Housing: 400mm x 300mm, Entry Holes: Ø22.0 or M20 cable glands.

Order Reference

Programmable Trip Amplifiers

• TX9131: PROGRAMMABLE TRIP AMPLIFIER (4...20mA)
• TX9132: PROGRAMMABLE TRIP AMPLIFIER (0.4...2V)
• TX9134: DISCONTINUED
• TX9136: PROGRAMMABLE TRIP AMPLIFIER (Bridge)
• TX9137: PROGRAMMABLE TRIP AMPLIFIER (ac)

Interposing Relay

• TX9139: INTERPOSING RELAY

Specify Output Signal:

• Two Relay Contacts (31)
• One Relay Contact/4...20mA (32)
• One Relay Contact/0.4...2V (33)

Specify Mounting Options:

• Din Rail Mounting (41)
• 19" Rack Mounting (TX9139 Only) (42)

Specify Vibration Sensor Input:

• a.c. rms (for TX9137) (51)
• a.c. peak (for TX9137) (52)

Specify Bridge Input:

• Strain Gauge mV/V (for TX9136) (310)
• Bridge mV/V (for TX9136) (311)

Disclaimer

The information provided in this document contains general descriptions and technical characteristics of the product's performance. It is not intended as a substitute for, and should not be used for determining suitability or reliability for specific user applications. Users and installers are responsible for performing appropriate risk assessments and testing of the products in relation to their specific application or use. Trolex shall not be liable for misuse of the information contained herein. When instruments are used for applications with technical safety requirements, relevant instructions must be followed. All pertinent state, regional, and local safety regulations must be observed when installing and using this instrument. For safety reasons and to ensure compliance with documented system data, only Trolex or its affiliates should perform repairs to components.

Trolex Ltd. reserves the right to revise and update this documentation from time to time without obligation to provide notification of such revision or change. Revised documentation may be obtainable from Trolex. Trolex Ltd. reserves the right, without notice, to make changes in equipment design or performance as progress in engineering, manufacturing, or technology may warrant.

Trademark

© 2025 Trolex® Ltd.

No part of this document may be reproduced in any form or by any means, electronic or mechanical, including photocopying, without express written permission of Trolex. Trolex is a registered trademark of Trolex Ltd. The use of all trademarks in this document is acknowledged.