Keller’s series 21Y range of miniature piezoresistive pressure transmitters has an extremely small temperature error. This is achieved by using an additional circuit containing a temperature sensor that subdivides the temperature range into fields 1,5 Kelvin wide.
The TK (zero) and TK (compensation) values are calculated for each field and programmed into the supplementary circuit. To improve linearity and accuracy these values are then fed into the analogue signal path for device calibration at the operating temperature.
In theory, 120 fields are available representing a possible temperature span of 180 K: the wider the temperature range, the greater the amount of testing that is needed to minimise the inaccuracy of the mathematical model.
Keller manufactures the pressure sensors (insulated measuring cells) in large quantities. These are then welded into the required transmitter head, equipped with electronics and calibrated over the entire temperature and pressure range in systems with up to 1000 measuring stations.
mPm connectors, M12 connectors, Packard connectors and cable connections are used as standard for the electrical connection. In the relative pressure version, the ambient pressure goes into the interior via cable or connector.
These transmitters have good immunity to external voltages between the housing and the electrical connection. The insulation voltage of 300 V makes this product ideal for use in harsh of environments.
2-wire (4-20 mA) or 3-wire versions with voltage as an output are available.
VEGA pressure instrumentation supports resilient water network management VEGA Controls SA
Pressure Measurement & Control Flow Measurement & Control
As rapid urbanisation and climate pressures strain water networks across Africa, accurate real-time pressure monitoring has become a strategic necessity. VEGA’s pressure instrumentation helps utilities reduce losses, protect infrastructure and meet sustainability targets.
Read more...Field calibration made easy Instrotech
Maintenance, Test & Measurement, Calibration
Instrotech’s locally designed and manufactured Calog calibrator range feature a rugged IP54-rated housing, backlit display with data logging via SD card, and a lithium-ion battery with approximately eight hours of run time.
Read more...Groundwater level measurement using LoRa module Instrotech
Level Measurement & Control
Monitoring groundwater levels across large industrial sites is critical. Salzgitter Digital Solution was tasked with developing a fully automated and digital monitoring system using Long Range Wide Area Network technology.
Read more...Infrared solutions for glass manufacturing challenges Instrotech
Temperature Measurement
In the glass industry, infrared temperature monitoring is crucial for maintaining product quality and process efficiency. Instrotech has infrared sensors and cameras which provide non-contact temperature measurements, making them ideal for these high-temperature environments.
Read more...Embracing digital precision in instrument manufacturing SA Gauge
Pressure Measurement & Control
In modern instrumentation manufacturing, precision is no longer limited to measurement alone. One area undergoing notable change is the printing of instrument plates and branded components.
Read more...Senix sensors provide flood warnings Instrotech
Flow Measurement & Control
To create the world’s most sophisticated flood monitoring and forecasting system, the US State of Iowa’s Flood Centre (IFC) uses more than 200 Senix ToughSonic 30 and ToughSonic 50 ultrasonic sensors to measure water levels in streams across the state.
Read more...Sensors measure palm oil tank level Instrotech
Level Measurement & Control
The Senix ToughSonic 30 accurately measures and monitors the level of palm oil in large tanks approximately nine metres in height.
Read more...Water under pressure VEGA Controls SA
Pressure Measurement & Control
The need for real-time monitoring and precise control over water distribution has never been more critical. VEGA’s range of pressure sensors and level instruments plays an important role in ensuring that water systems operate efficiently.
Read more...Paper might carry the message, but pressure carries the process VEGA Controls SA
Pressure Measurement & Control
VEGABAR pressure transmitters are designed to address the unique challenges faced by the pulp and paper industry. Built for durability and precision, they ensure reliable pressure monitoring in aggressive environments.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version