A common concern when selecting a pressure transducer is the performance in various temperature conditions. Temperature is an important specification, as it has a direct effect on the accuracy of the transducer. Significant errors in the pressure readings or complete failure of the transducer are possible if installed in an environment that is outside the specified ranges. In this blog post, we will discuss the different temperature specifications commonly found on our datasheets and how to interpret them to make the most informed pressure transducer selection.
The operating temperature specification refers to the minimum and maximum temperature that the transducer’s body, or housing, can tolerate. For example, the operating temperature of the CS10 Industrial Pressure Transducer is listed as -40 to +85°C. Temperature limitations of the electronics and other components within the body of the transducer dictate the operating temperature specification.
The media temperature specification refers to the minimum and maximum temperature that the transducer’s process connection and diaphragm can tolerate. Media is the liquid or gas measured by the transducer. This specification typically has a wider range than the operating temperature as there is more material separating the temperature from the sensitive electronics found in the sensors body.
The compensated temperature specification refers to the temperature range that the transducer has been conditioned to during manufacturing. This conditioning allows the transducer to control, or compensate, the amount of temperature error to a specified amount when within this range. For example, the CS10 Industrial Pressure Transducer has a compensated temperature of 0 to +55°C. The internal electronics of the CS10 can control the amount of error that is experienced as long as the temperature stays within this specified range. The amount of allowable error within this range is known as TC Zero and TC Span
The storage temperature specification refers to the minimum and maximum temperature that the transducer can be exposed to when not in operation. This temperature range is typically wider than the operating temperature since the circuitry of the sensor is not in use and temporary errors are not noticed. For example, the storage temperature of the CS10 Industrial Pressure Transducer is -40 to +125°C. Care should be taken to ensure storage temperatures do not exceed the specified range as damage to the sensor can still occur.
TC Zero & TC Span
TC, or Temperature Coefficient, is the maximum error allowed when operating within the transducers compensated temperature range. TC Zero refers to the effect of temperature on the zero signal while TC Span refers to the effect of temperature on the full-scale output of the transducer. Using room temperature as a reference point, the temperature error of the zero signal increases within the specified TC as you move further away from room temperature. This specification is typically listed as a percentage of FS. For example, with a compensated temperature of 0 to +55°C on our CS10 transducer, the TC Zero, and TC Span are specified as ≤ ± 1% of FS (≤ ± 2% of FS for pressures 2 PSI & below).
Note: The allowable TC Zero and TC Span for pressure ranges 2 PSI and below is ≤ ± 2% of FS
CS10 Pressure Transducer
Core Sensors offers the CS10 industrial pressure transducer designed for demanding industrial applications. The CS10 uses MEMS silicon strain gages mounted to a stainless steel or nickel alloy sensing element. The ASIC electronics offer analog voltage or 4-20mA loop powered output signals. Various process connections are available in 17-4PH, 316L, or nickel alloy including Hastelloy C276 and Inconel 718. Electrical connections include cable or various integral connectors. Semi-custom and custom designs are available.