Yarn tension monitor ETM RS422

Overview
The Eltex Tension Monitor (ETM) is an on-line device for sewing machines and similar applications. The device monitors thread tension and functions as a thread break detector, helping operators maintain the required tension range for optimal seam quality. The ETM 422 is designed for OEM integration and communicates with the host machine controller via an RS422 interface. Eltex supplies the communication protocol.

Calibration
Eltex provides accredited calibration for this unit. The calibration method is approved according to ISO/IEC 17025.

Typical Application

• On-line thread tension monitoring and thread-break detection for sewing machines and comparable textile equipment.

Features

• Monitors thread tension against software-set limits via RS422 interface.
• Programmable measuring ranges.
• Programmable RS422 message containing peak tension and monitor status for every stitch.
• Programmable stop-filter function (1–15 stitches).
• Generates stop pulse when tension is outside selected stop limits.
• Separate sensor head and electronics box for installation in confined spaces.
• LED indicators for monitored limits and a synchronization input.
• Alarm messaging via RS422 and a separate optocoupler output.
• Factory calibrated — no manual reset required.
• ESD-protected inputs and optocoupler outputs.

Advantages

• Improves sewing quality by keeping consistent thread tension.
• Enables correct thread-tension operation and easier setup of bobbin tension.
• Functions as thread-stop motion and thread-break detector.
• Protects against overtension and alerts to contamination in tensioners.

Models

• Part no 14610 – 0.5 m cable between sensor head and electronics box
• Part no 14611 – 0.1 m cable between sensor head and electronics box

Technical specifications

• Measuring range adjusted within: 0–1200 cN
• Available measuring ranges: 0–128 cN, 0–256 cN, 0–384 cN, 0–512 cN, 0–640 cN, 0–768 cN, 0–896 cN, 0–1024 cN, 0–1152 cN, 0–1280 cN (also listed: 0–1408 cN, 0–1536 cN)
• Stop filter: 1–15 stitches
• RS422 parameters: 9600 baud, 1 start bit, 8 data bits, 1 stop bit, even parity
• Supply voltage: 10–38 V DC
• Maximum current consumption: 50 mA
• Maximum start peak current: 500 mA (at 38 V DC and power-supply start-up time = 30 ms)
• Speed range: 120–10 000 RPM
• Message alert pulse length: minimum 2 seconds
• Cable length between sensor head and electronics box: 100 mm or 500 mm
• Electronics box dimensions: 97 x 61 x 26 mm (W x H x D)
• Sensor head dimensions: 22 x 44 x 28 mm (W x H x D)
• Message alert output: optocoupler TLP127, max. 100 mA
• Synchronization input: optocoupler TLP112, Rin 1.5 kΩ, Vin 5–35 V DC
• Working ambient temperature: 15–45 °C (60–110 °F)
• Working ambient humidity: 0–95% RH (at 45 °C), no condensation