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TSL – Terminal Straight Line

Terminal Straight Line (TSL) is a straight line drawn between the measurement output at zero and at full scale.

The TSL is used as a reference for stating the accuracy of a measurement device in a more practical way to help the user determine the reading accuracy.  In most applications the device will be calibrated at zero and full scale.

Since the errors may be weighted to one side of the TSL, it is possible to improve on the accuracy by using the BSL as a reference, but calibration is not as straightforward as the TSL method.

Featured high accuracy measurement products

  • DM01 Multi-Range High Accuracy Pressure Gauge
  • DPT100 Modbus RTU RS485 Differential Pressure Sensor
  • High Accuracy Digital Interface Pressure Sensors
  • High Accuracy and Precision, Voltage Signal Output Pressure Transducers

Glossary of Calibration technical terms

  • BSL – Best Straight Line
  • Compensated Temperature Range
  • Dead Weight Tester
  • NPL – National Physical Laboratory
  • PPM – Parts Per Million
  • Primary Pressure Reference Standard
  • Secondary Pressure Standard
  • Span Offset
  • Traceable Calibration
  • UKAS – The United Kingdom Accreditation Service
  • UKAS Calibration Certificate
  • Zero Offset
  • Zero Tare

Help from Calibration resources

  • Determining calibration error of Bourdon tube pressure gauge
  • What is the difference between zero offset and zero drift?

Guidance with Calibration requirements

  • ADT901 low pressure test pump with test gauge and process transmitter Pressure Calibration

Tools for Calibration calculations

  • Pressure Sensor Calculator
  • Temperature Sensor Calculator
  • DP Flow Transmitter Output Calculator

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