The intelligent SensoWeb Guard web break detection system is designed for demanding paper mill environments. It combines multiple sensing technologies to identify web breaks accurately, prevent false or missed alarms, protect dryer cylinders and dryer fabrics, and improve production efficiency and stability.

SensoWeb Guard-HT (High-temperature Version)

For high-temperature locations including dryer sections, press sections and coaters

Fiber-optic design, resistant to high temperatures and contamination

The electronic unit can be installed outside the dryer hood, away from heat and dust

Optical signals are transmitted to the measuring point through fiber optics

Product Advantages:

No reflector required

Temperature resistance up to 200°C

The sensor can be mounted above the web or outside the cylinder group

High light intensity and optional air purging provide strong resistance to contamination

Modular design with different probes, cantilever lengths and mounting options

Three Models

Guard-HT/S (Standard Version)

Guard-HT/A (Air-purged Version): air-purged probe and analog output

Guard-HT/T (Triangulation Version): adjustable detection window for effective background suppression

Standard Configuration

High-performance fiber-optic cable (temperature resistance above 200°C)

Power supply: 24 VDC / 90–230 VAC

Cantilever with sensor probe

Ball-joint bracket for easy alignment

Cantilever lengths: 0.4/0.8/1.2/1.8 m (0.4/1.2 m for A/T versions)

SensoWeb Guard-LT (Low-temperature Version)

Non-fiber-optic web break detector for calenders, roller tables and press sections below 60°C

Guard-LT/R: single-source sensor, maximum sensing distance 6 m

Guard-LT/LB: through-beam light barrier, maximum sensing distance 30 m

High optical power and contamination resistance

Optional air purging (Guard-LT/A)

Compact installation dimensions for narrow gaps

SensoWeb Guard-mat (Material Identification Version)

For web break detection against dryer fabric or press felt backgrounds. Conventional photoelectric and color sensors have difficulty distinguishing paper from fabrics. This series uses SWIR quasi-spectral sensing to identify materials by their absorption characteristics:

Guard-mat/DE: dryer fabric backgrounds in the dryer section

Guard-mat/PF: felt backgrounds in the press section

Guard-mat/DF: additional monitoring of dryer fabric aging

Configuration & Commissioning

Premium quartz fiber-optic cable, temperature resistance above 200°C, maximum length 15 m

Commissioning / monitoring: TrildentMaster PC software or browser-based Trildent Dashboard with the TID-COM_U Ethernet gateway

Applications & Environmental Conditions

Sensor Series	Installation Location	Working distance	Ambient Temperature Requirements
SensoWeb Guard-HT	Dryer groups and upstream press section	Approx. 0.1–1.5 m	Sensor head / cantilever: above 200°C maximum; sensor body: maximum 40°C/60°C depending on model
SensoWeb Guard-LT/R	Calenders and rollers	Maximum 6 m	Sensor body: maximum 40°C/60°C depending on model
SensoWeb Guard-LT/L	Presses and coaters	Maximum 30 m	Sensor body: maximum 40°C/60°C depending on model
SensoWeb Guard-mat	Dryer fabric / press felt environments	Approx. 0.2 m	Sensor head / cantilever: above 200°C maximum; sensor body: maximum 40°C/60°C depending on model

Core Sensor Specifications

Parameter	Guard-HT / Guard-LT Series	Guard-mat Series
Representative Models	Guard-HT: MID-ARF-P190-N…Guard-LT/R: MID-AR-P190-N…Guard-LT/L: MID-ALS+MID-ALE	Guard-mat-DF: TID-AMF-P190-S3Guard-mat-PF: TID-AMF-P190-S1
Light source	Near-infrared (NIR) LED, 0.9 μm, pulsed	Short-wave infrared (SWIR) LED, 1–2 μm, pulsed
Ambient-light interference	Unaffected, except Guard-LT/LB	Completely unaffected
Switching Frequency	100 Hz	20 Hz (adjustable)
Detection Range Adjustment	Manual adjustment	Adjustment through PC software / IP web dashboard
Supply voltage	24 VDC / 90…230 VAC	24 VDC
Power Consumption	24 VDC: 120-200 mA230 VAC: 22-26 mA	-
Relay Outputs	2 × SPDT relays (paper / alarm)	2 × SPDT relays (paper / alarm)
Analog Outputs	1 × 4–20 mA (light intensity)	2 × 4–20 mA (web break / contamination)
Status Indicators	Power (green), paper (yellow), alarm (red)	Power (green), paper (yellow), alarm (red)
Contamination Monitoring	Alarm signal and light intensity display (D version) / analog signal	Analog signal (#A2R)
Protection rating	IP 65	IP 65
Connection	Clamp connection	Clamp connection

Fiber Optics & Mechanical Construction

Item	Guard-HT / Guard-LT Series	Guard-mat Series
Fiber-optic Specifications	Fiber bundle in a stainless-steel protective hose; flexible, impact-resistant and liquid-resistant; temperature resistance above 200°C. Model: FO-MI10-DI-10VB5-CO9-10A8/#m. Maximum length: 25 m	Fiber bundle in a stainless-steel protective hose; flexible, impact-resistant and liquid-resistant; temperature resistance above 200°C. Models: FO-TI15-R-3QB2-CO9-10A8/#m and FO-TI15-R-10VB5-CO9-23Z19/#m. Maximum length: 15 m
Cantilever / Sensor Head Material	Stainless steel, with MP 150-S quick-release mounting bracket	Stainless steel, with MP 150-S quick-release mounting bracket
Available Cantilever Configurations	Guard-HT/S: ball joint, 0.4/0.8/1.2/1.8 m. Guard-HT/A: ball joint and air purging, 0.4/1.2 m. Guard-HT/T: background suppression, 0.4/1.2 m	Guard-mat-DF/PF: air purging, 1.2 m (0.8 m for mat-PF)

Accessory	Specification / Applicable Series
I-type Height Adjustment Rod	Adjustment ranges: 128–200 / 200–340 / 340–600 mm; suitable for all series
TID-COM_U Ethernet Gateway	For Guard-mat series only; remote monitoring and parameter settings