Products built for safety and continuous operation.

Pressure Sensor – Transformer Oil Circuit

The Pressure Sensor for Oil Circuit Transformer, designed as per CLW/ES/3/0035/I, is used for reliable monitoring of transformer oil pressure in electric locomotives.

The sensor measures oil pressure over a 0–4 bar range and provides a proportional 4–20 mA output to the locomotive monitoring and control system. It operates from the locomotive's DC power supply and uses a robust current-loop interface for reliable signal transmission in demanding railway environments.

• Pressure range: 0–4 bar
• Output: 4–20 mA
• Supply: 18–30 V DC
• Transformer oil circuit monitoring
• Designed for railway locomotive applications
• Conforming to CLW/ES/3/0035/I

Differential Amplifier – Transformer Oil Circuit

The Differential Amplifier for Oil Circuit Transformer, designed as per CLW/ES/3/0035/I.

It receives 4–20 mA signals from two pressure sensors and converts the pressure difference into a proportional 4–20 mA output for the locomotive monitoring and control system.

• Differential pressure range: 0–2 bar
• Input: Two × 4–20 mA
• Output: 4–20 mA
• Supply: 18–30 V DC
• Low noise and high stability
• Short-circuit and reverse-polarity protection
• Designed for electric locomotive applications
• Conforming to CLW/ES/3/0035/I

Main Reservoir Pressure Transducer

The Main Reservoir Pressure Transducer (MRPT) is used in locomotive air-brake systems to continuously measure the compressed-air pressure in the Main Reservoir (MR1).

It converts pneumatic pressure into an electrical signal for the locomotive control system, enabling pressure monitoring and automatic compressor loading/unloading control. In WDG4/WDP4 locomotives, the MRPT provides pressure feedback to the locomotive control system.

• Main reservoir air-pressure monitoring
• Pneumatic-to-electrical signal conversion
• Continuous pressure feedback
• Supports compressor control
• Designed for locomotive applications
• Suitable for demanding railway environments
• Conforming to EMD PART No.40052557, BLW REFERANCE DRAWING No. 40059359 Alt Jb

Completely Assembled Temperature Sensor Used In 3Ph Traction Motors

The Fully Assembled Temperature Sensor is designed for stator outer-surface temperature monitoring of 3-phase traction motors used in locomotives. It provides reliable temperature sensing under demanding railway operating conditions.

• Stator outer-surface temperature monitoring
• PT100 Class B sensing element
• Stainless-steel construction
• Robust housing with brass fittings
• Insulated wiring and connectors
• Suitable for traction motor 6FRA6068 & 6FXA7059
• Designed for reliable railway service
• Conforming to 4TMS.096.085, Rev-2

Electronic Time Delay Relay – AC Coaches

The Electronic Time Delay Relay is designed for the control panels of air-conditioned railway coaches. It provides precise time-delayed switching of electrical loads, supporting the sequential operation of coach equipment such as compressors.

Designed as per RDSO/PE/SPEC/AC/0060-2004 (Rev. 0), the relay provides reliable and repeatable timing performance for railway HVAC control applications.

• Electronic time-delay operation
• Designed for AC coach control panels
• Supports sequential compressor operation
• Reliable and repeatable timing
• Suitable for railway HVAC applications
• Conforming to RDSO/PE/SPEC/AC/0060 2004 (REV." O")

Earth Fault Relay

The Earth Fault Relay, designed as per CLW/ES/3/0090, is used in 3-phase electric locomotives to detect earth-fault/leakage current in the auxiliary converter, harmonic filter and control circuits.

It provides a reliable protective signal to the locomotive control system when the preset leakage-current level is exceeded.

• Earth fault and leakage-current detection
• Used for auxiliary converter and harmonic filter circuits
• Current rating: 150 mA AC
• Relay output contact for protection/control
• Compact and robust construction
• Fire-retardant/self-extinguishing enclosure
• Designed for 25 kV AC, 3-phase electric locomotives
• Conforming to CLW/ES/3/0090 Alt. C

Fire Detection Unit (FDU)

Fire Detection Unit (FDU) is an air-sampling fire detection system designed for electric locomotives. It continuously monitors sampled air from the locomotive equipment areas for early detection of smoke and potential fire conditions.

The unit incorporates two opto-electronic smoke sensors along with a suction system and airflow monitoring to provide reliable smoke detection. The system also provides visual indications for normal operation, fault/malfunction, and individual smoke detector alarms.

The FDU provides potential-free relay outputs for integration with the locomotive's control and protection circuits. It supports a pipe network with up to 20 suction points and a maximum pipe length of 30 m.

• Air-sampling based fire and smoke detection
• Two independent opto-electronic smoke sensors
• Integrated airflow monitoring
• Suction system with radial fan
• Visual indication for Operation, Fault, Smoke Detector 1 & 2
• Four potential-free relay outputs for Fire Detector 1, Fire Detector 2, Fault, and Reset
• Configurable fault signalling delay of 0.5, 2, 16 or 128 minutes
• Supports up to 20 suction points
• Maximum suction pipe length of 30 m
• 20–30 VDC operating supply, 24 VDC nominal
• Manual system reset facility
• Designed for continuous operation in electric locomotives
• Operating temperature: −25°C to +70°C
• Conforming to IEC 60571, EN 54-7/9 and CLW/ES/3/0057

Microprocessor-Based Electronic Speed Cum Energy Monitoring System (ESMON)

The Microprocessor-Based Electronic Speed Cum Energy Monitoring System (ESMON) is a railway-grade monitoring and recording system designed for electric locomotives. It acquires locomotive speed and electrical energy parameters, processes them through a microprocessor-based system, and provides real-time indication and recording of operating data.

The system interfaces with a Pulse Generator (Speed Sensor) for speed and distance measurement and uses CT and PT inputs through a Signal Conditioning Unit for electrical parameter and energy measurement.

• Microprocessor-based speed measurement, indication and recording
• Electrical energy measurement and monitoring
• Master Recorder-cum-Indicator
• Slave Speed Indicator
• Pulse Generator / Speed Sensor interface
• CT and PT measurement inputs
• Signal Conditioning Unit for electrical inputs
• Junction Box, Senscon clamps and dedicated interconnecting cables
• Journey data storage and retrieval
• Parameter configuration and display
• Evaluation software for recorded data
• Designed for conventional AC and applicable three-phase locomotive configurations
• Conforming to RDSO Specification No. ELRS/SPEC/SPM/0002 Rev. 4