Triboelectric filter monitoring

October 2004 Maintenance, Test & Measurement, Calibration

Durag has introduced the D-FW 230/D-FW 231 filter monitors designed for continuous monitoring of filter installations in flue gas ducts, duct work for dust extraction and similar applications. The system offers several advantages over comparable optical devices, including low purchase, low installation and maintenance costs, as well as high performance.

The filter monitor is placed on the clean-gas side, behind a filter, and will report any defect. By using filter monitors at the most important emissions sources or filters, appropriate action may be taken in the event of a malfunction to prevent or limit damage such as shutting down the defective filter chamber.

Operating according to the principle of triboelectric measurement, the filter monitor provides continuous in situ measurement and is suitable for baghouse monitoring. A measuring probe inserted into the flue gas duct allows the sensor to record the electrical charge of the dust particles. Complete signal processing occurs in the sensor. The measured value is then transmitted as an interference resistant 4-20 mA signal and is available at the terminal strip.

Designed for single applications, the D-FW 230's control unit monitors the measured values digitally and uses a relay to signal any excess in limit value. The limit value threshold may be set between 4-20 mA, and zero testing may be carried out directly from the control unit with the flip of a switch. The D-FW 231 probe is suitable for use in a multi filter plant where supervision of all filters is done by a central processing unit. Limit values, zero testing and measurements are analysed via a PC.

If required, a portable monitoring system is available consisting of the D-FW 231 filter monitor with three probes, a strip chart recorder and additional accessories in a portable case.

For more information contact Noel Bauchop, OEN Enterprises, 011 675 4447, noel@oenenterprises.co.za, www.oenenterprises.co.za

Further reading:

Engineering partnership delivers longer life for vibrating feeders in mining
Maintenance, Test & Measurement, Calibration
: OST-Africa’s combination of VISAM vibrating motors and advanced rubber mounting technology has helped Euro Sales achieve a 30 to 40% increase in component life on vibrating feeders at several major mining operations, with zero mount failures in the first 12 months.

Read more...

---

When oil can’t take the heat
Maintenance, Test & Measurement, Calibration
Unlike the slow ageing of oxidation, thermal breakdown is the sudden chemical collapse of a lubricant under excessive heat. Steven Lumley of WearCheck explains how it happens, where it strikes, and how oil analysis detects it.

Read more...

---

Mini data loggers for temperature and humidity monitoring
Maintenance, Test & Measurement, Calibration
Testo’s range of four compact data loggers covers temperature and humidity monitoring for storage, refrigeration and transport applications, with USB-C or Bluetooth connectivity and capacity for up to 16 000 readings.

Read more...

---

Alternative fuels for cutting, brazing, soldering and heating
Maintenance, Test & Measurement, Calibration
Bolt and Engineering Distributors, as an authorised distributor for the Harris Products Group, is helping South African industries transition from acetylene to safer, more cost-effective alternative fuels for cutting, brazing, soldering and heating applications.

Read more...

---

Rethinking corrosion protection in process plants
Omniflex Remote Monitoring Specialists Maintenance, Test & Measurement, Calibration
Remote monitoring is changing how cathodic and anodic protection systems are managed in process plants, giving operators continuous visibility of corrosion protection performance and enabling more proactive maintenance decisions.

Read more...

---

Installation safety tester
Vepac Electronics Maintenance, Test & Measurement, Calibration
A combination measuring device for testing electrical installations, offering safety tests including RCD, voltage, loop, low-resistance, earth resistance and insulation checks via a 3,5-inch TFT colour display.

Read more...

---

Bringing predictive maintenance to the next level in the pulp and paper industry
Maintenance, Test & Measurement, Calibration
ennomotive has launched an international competition seeking innovative predictive maintenance solutions for conveyor belt systems, addressing a real operational challenge faced by pulp and paper company CMPC.

Read more...

---

Vibration sensor with CANopen interface for mobile machines
ifm - South Africa Maintenance, Test & Measurement, Calibration
ifm’s 3-axis VMB301 condition monitoring sensor integrates into the vehicle network via CANopen, delivering real-time bearing, vibration and temperature data to help mobile machines avoid costly damage and downtime.

Read more...

---

Linear regulated 2-channel laboratory power supply
Vepac Electronics Maintenance, Test & Measurement, Calibration
Vepac Electronics offers a dual-channel laboratory power supply built for safe, precise testing in laboratories and workshops.

Read more...

---

When oil gets old
Wearcheck Maintenance, Test & Measurement, Calibration
WearCheck explains how oxidation breaks down lubricating oils over time, and how routine oil analysis can catch the warning signs before equipment failure.

Read more...

---