Temperature Measurement

Temperature monitoring with a difference

May 2002 Temperature Measurement

Omniflex is now offering OmniWatch, which it says is a temperature monitoring system with a difference. Sixteen temperatures can be monitored at once without any multiplexing - and no rotary switches. The inputs may come from any 3-wire RTDs or thermocouples and cold junction compensation and linearisation are standard features.

Each temperature input has an alarm and trip setpoint allocated to it, and the setpoints are configurable via the front panel keypad. Each setpoint is represented by an LED indicator that can be configured with an optional enunciator sequence. This forces the operator to silence the audible, and acknowledge the alarm. An auto, or manual reset option can be chosen.

Each temperature channel may be viewed in turn on the front panel LCD display with its setpoints by using a scroll button. OmniWatch has an option to automate the display so that the display automatically scrolls through the channels at a specified time interval.

Each setpoint can have a relay or open collector output for the alarm status; these can be used to drive external devices when the setpoints are reached. To save on relay outputs group alarm functions are used to bring up alarm for the attention of operators. There are four group alarms. One each for setpoint 1 and setpoint 2 - and one each to function as a high high or low low group alarm. Every input is mapped to the group alarm.

The temperature inputs can be re-transmitted to another device as 4-20 mA outputs by simply fitting an analog output module to the OmniWatch.

Date and time stamp of alarms

Every alarm or trip is date and time stamped as it occurs.

This is useful for stringent quality control systems where recording of alarm and trips are required. These events are available to the Conet local area network which can route them to a scada database system.

OmniWatch has a history log which captures the last 64 trips and alarms with its date and time stamp and this can be viewed via the front panel of the OmniWatch. Operators thus have access to the latest information.

Up to 127 OmniWatch devices may be connected to a single twisted pair cable running the Omniflex Local Area Network - Conet. Conet is supported by most scada packages and can thus acquire the information from OmniWatch devices including all date and time stamped information.

Summary of OmniWatch unit features

* Alarm annunciation for temperature alarms and trips

* Display in degrees C or F.

* Front panel configuration or via PC.

* Re-transmit option (4-20 mA) for temperature inputs.

* Group alarm and trip facility.

* Optional independent alarm and trip outputs.

* Date and time stamp of alarms.

* History log of last 64 alarms and trips.

* Up to 127 OmniWatch devices on a twisted pair.


Building upon the 30 plus years of experience in the field of alarm and events monitoring instrumentation for industry, Omniflex continues to provide solutions for many plant applications such as temperature monitoring.

Ian Loudon, Omniflex

031 207 7466


Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Temperature transmitter family for all industries
June 2019, Endress+Hauser , Temperature Measurement
Endress+Hauser has introduced its first temperature transmitter with Bluetooth (BT) connectivity. This feature is unique because it does not require a BT modem to be able to communicate with the device ...

Powder coating cure performance
June 2019, R&C Instrumentation , Temperature Measurement
In any industrial paint or powder coating operation, getting the paint cure correct is critical to both the physical and cosmetic performance of the product. To get the best out of the coating, it is ...

Miniature float switch design
June 2019, WIKA Instruments , Temperature Measurement
WIKA now offers OEM manufacturers the miniature float switch model RLS-7000/8000, particularly suitable for level monitoring in small tanks. The performance and design meet the requirements of original ...

Merging control and telemetry
June 2019, Omniflex Remote Monitoring Specialists , Industrial Wireless
Wireless telemetry and control in plants have become a necessity with the data acquisition requirement of modern plant control to lift performance and compliance. In-plant cabling costs often push the ...

Safety temperature ­measurement device for boilers
Africa Automation Fair 2019 Preview, GHM Messtechnik SA , Temperature Measurement
GHM Messtechnik’s Safety-TL4896 is a SIL2-rated temperature measuring device from Martens, that conforms to international boiler regulations and offers a unique front panel installation. Certified to ...

Wireless vibration and ­temperature monitoring
Africa Automation Fair 2019 Preview, Turck Banner , Temperature Measurement
Banner Engineering’s wireless vibration solutions kit and temperature sensor provides superior machine monitoring. Designed to effectively monitor machines for increases in vibration and temperature, ...

Smart pyrometers
Africa Automation Fair 2019 Preview, R&C Instrumentation , Temperature Measurement
R&C Instrumentation is showcasing the Thermalert 4.0 pyrometer from Fluke Process Instruments at Stand F04. The series comprises 13 models with varied spectral responses, including dedicated sensors for ...

High definition thermal images
Africa Automation Fair 2019 Preview, Protea Automation Solutions , Temperature Measurement
Designed for measuring temperature profiles inside furnaces, the NIR-Borescope uses AMETEK Land’s cutting edge, near infrared imaging to create continuous, high definition thermal images. This allows ...

Responsive wireless I/O from ­Omniflex
May 2019, Omniflex Remote Monitoring Specialists , Industrial Wireless
Radio networks traditionally follow the Master (main station node) and Slave (out station node) methodology for data acquisition. A single master polls for data from one or more slaves, depending on the ...

Infrared cameras with leading edge technology
Africa Automation Fair 2019 Preview, Comtest , Temperature Measurement
The Fluke Ti450 and Ti480 PRO infrared cameras capture and display smaller temperature differences that visualise and diagnose issues, making it easier for technicians, engineers and electricians to get ...