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Product profile

Distributed optical fiber temperature measurement system

System overview

With high measurement accuracy, high sensitivity and precision positioning, this system can achieve continuous temperature measurement along dozens of kilometers of optical fiber and is very suitable for fire detection of linear space structure without leaking any point, greatly reducing the probability of false positives and false negatives. In case of fire, this system can capture the fire within the shortest time and link with other fire alarm equipment to protect safe operation of the monitored equipment.

System composition

The system is composed of the optical fiber temperature measurement host DTS and temperature sensing optical cable. The optical fiber temperature measurement host DTS is located in the control room. Only the temperature sensing optical cable shall be laid and then connected to the optical fiber temperature measurement host. Meanwhile, the optical fiber temperature measurement host is connected with the fire alarm controller through the relay output module, transmits the fire signal to the fire alarm controller and achieves linkage with other firefighting systems. The system can also transmit the alarm information to the remote control center via the network.

System advantages

1. Fast measurement speed and minimum measurement time of only 3s in single channel

2. Accurate positioning and positioning accuracy of less than 1m

3. Multi-level alarm mode: constant temperature alarm, differential temperature alarm and peak value alarm

4. Up to 500 single-channel partition alarms

5. Monitor all temperature points of the whole optical cable, zero false negative rate and zero false positive rate

6. Convenient system installation and simple construction

7. Low cost of standard network configuration and data transmission interface maintenance and system safety operation time up to more than 25 years

System applications

1. Comprehensive monitoring of smart grid: power cables, cable interlayers, cable tunnels and cable joints in power sector

2. Real-time online monitoring of digital port: port dumper area, belt conveyor, granary and silo

3. Fire detection in petrochemical industry: monitoring of oil tank initiation temperature, oil tank pipeline temperature and temperature and pressure in oilfield development

4. Subway and tunnel monitoring: temperature monitoring in the field of subway, tunnel and coal mine

5. Water conservancy and civil engineering: dam and river levee leakage monitoring

Technical parameters

Product Features:

a. Automatic temperature compensation technology, more stable and reliable;

b. One-way measurement time 1-30s settable;

c. Dedicated temperature sensing optical cable, with fast heat transfer;

d. Flexible software transport protocol, supporting secondary development;

e. Support a variety of alarm modes, link with alarm host.

Monitoring distance 2km	2km (2-15km optional)
Number of channels	2-32 channels
Positioning accuracy	0.5m
Spatial resolution	0.5m
Measurement accuracy	1℃
Measurement time	1-20s optional
Temperature measurement range	-50-750 (depending on temperature sensing cable)
Optical fiber type	62.5/125μm or 50/125μm
Communication protocol	UDP/RS232

Structure features

Temperature sensing optical cable

1) General temperature sensing optical cable

Apply to the environment with high requirements for optical fiber damage resistance, such as field tunnel, high voltage cable and cable trench, bridge, building, oil well and pipeline. Pressure, tension, corrosion, rats, aging and other factors shall be considered generally in such environment.

The double-layer stainless steel armor construction can be used to meet the requirements of such environment.

a) Name: Armored multi-mode sensing optical cable

b) Specification: Multi-mode 50/125 (or 62.5/125)

c) Product structure: 0.6mm multi-mode 50/125 optical fiber + stainless steel metal hose + 2-strand Kevlar + stainless steel braid + PVC sheath; product outer diameter: 3.0mm+/-0.1mm; weight: about 17~18KG/km; compressive strength: 3000N/100mm; tensile strength: 300N; temperature measurement range: -40~85℃

d) Basic optical parameters of optical cable: attenuation 850nm ≤3.00db; 1300nm≤1.00db; bandwidth ≥400MHz.km

e) Service life: 20 years

2) Seamless tube type temperature sensing optical cable

Apply to humid, rat-proof and damage resistant environment, such as cable trench and cable surface-mount temperature measurement

a) Name: Seamless tube type temperature sensing optical cable;

b) Specification: Multi-mode 50/125 (or 62.5/125)

c) Product structure: multi-mode 50/125 optical fiber + stainless steel seamless tube (optional jelly-filled) + PE sheath; product outer diameter: about 3.5mm; weight: 15KG/km; compressive strength: 3000N/100mm; tensile strength: 2000N; temperature measurement range: -40~85℃

d) Basic optical parameters of optical cable: attenuation 850nm ≤3.00db; 1300nm≤1.00db; bandwidth ≥400MHz.km

e) Service life: 20 years

3) Copper wire gauze shielded temperature sensing optical cable

Apply to statistic-shielded environment such as petrifaction and pipeline

a) Name: Copper wire gauze shielded temperature sensing optical cable;

b) Specification: Multi-mode 50/125 (or 62.5/125)

c) Product structure: multi-mode 50/125 optical fiber + stainless steel metal hose + 2-strand Kevlar + stainless steel braid + PVC sheath + nickel plated copper wire gauze; product outer diameter: about 3.5mm; weight: 23KG/km; compressive strength: 3000N/100mm; tensile strength: 300N; temperature measurement range: -40~85℃

d) Basic optical parameters of optical cable: attenuation 850nm ≤3.00db; 1300nm≤1.00db; bandwidth ≥400MHz.km

e) Service life: 20 years

Specification model

● Distributed temperature measurement system model

BGMD-DTS