Precision temperature measurement in heat and cold meters
PT100/500/1000 Resistance Temperature Detectors (RTDs) are widely used in grid infrastructure and factory automation applications where high precision temperature measurement is often required. Technical requirements include either 20 mK precise Differential Temperature Measurement (DTM) for heat and cold meters from 0 to 180°C or better than 400 mK precision over the full range of -200 to 850°C for industrial sensor transmitters. This training will cover a system-level deep-dive on how using TI’s ADS1220 Delta-Sigma converter family enables precise temperature measurement in heat and cold meter applications with standard RTDs.
The 24-bit ADS1220 family of devices offers an ultra-low power, single-chip precision temperature solution for measuring up to two 2- or 4-wire RTDs in series, achieving up to 19.6 bits of effective resolution, better than 10 mK resolution and 20 mK accuracy of the DTM. Using either SPI, I2C or UART interface the ADS1220 devices can be connected to TI's MSP430FR6989 (rotation detection sensing) or MSP430FR6047 (ultrasonic flow measurement) MCUs, completing a heat or cold meter development platform.
TMP116 is a fully digital, high-precision temperature sensor, which is more accurate than the Class AA RTDs in the -55 to +125°C range with a single-point calibration. TMP116 integrates 64 bits of user data for storing calibration data and eliminates the paperwork between PT sensor and heat meter vendors.
The 2x2 mm TMP116 digital sensor with I2C interface can be built into a standard PT sensor body and connect directly to the heat or cold meter MCU such as MSP430 or CC13xx wireless MCU families. TI's TPD1E04 or TPD1E10B devices ensure compliance with EN61000-4-2 and -4-4, as required by the EN1434-4 heat meter norm.
1. Overview of temperature measurement in heat meters
# | Title | Duration | ||
---|---|---|---|---|
1.1 |
Overview of precise temperature measurement for heat meters
TI’s ADS1220 Delta-Sigma converter enables precise Differential Temperature Measurement in heat and cold meter applications with standard PT sensors
|
02:25 | TI’s ADS1220 Delta-Sigma converter enables precise Differential Temperature Measurement in heat and cold meter applications with standard PT sensors | |
1.2 |
RTD sensors for industrial applications
Resistance Temperature Detectors (RTDs) offer linearity, long-term stability and repeatability over an extended temperature range
|
05:21 | Resistance Temperature Detectors (RTDs) offer linearity, long-term stability and repeatability over an extended temperature range |
2. Measuring RTD sensors with Delta-Sigma ADS1220 family
# | Title | Duration | ||
---|---|---|---|---|
2.1 |
Ratiometric RTD measurement in heat meters
SigmaDelta Precision ADC solution for temperature measurement in heat and cold meters
|
05:20 | SigmaDelta Precision ADC solution for temperature measurement in heat and cold meters | |
2.2 |
How to measure RTDs with Delta-Sigma ADC
Precision temperature measurement with Delta-Sigma analog-to-digital converters
|
03:55 | Precision temperature measurement with Delta-Sigma analog-to-digital converters | |
2.3 |
Design process with ADS1220 for RTD sensor measurements
ADS1220 temperature measurement with two 2-wire and 4-wire RTDs in a series for heat and cold meters achieves up to 19.6 bits effective resolution
|
11:29 | ADS1220 temperature measurement with two 2-wire and 4-wire RTDs in a series for heat and cold meters achieves up to 19.6 bits effective resolution |
3. Differential Temperature Measurement sub-system reference design
# | Title | Duration | ||
---|---|---|---|---|
3.1 |
High precision temperature measurement with TIDA-01526
Differential Temperature Measurement (DTM) sub-system using ADS1220 with better than 0.02ºC accuracy for two 2-wire or 4-wire RTDs in series
|
08:01 | Differential Temperature Measurement (DTM) sub-system using ADS1220 with better than 0.02ºC accuracy for two 2-wire or 4-wire RTDs in series |
4. Digital temperature sensor replacement of RTD sensors with TMP116
The TMP116 digital precision temperature sensor for the -55 to +125ºC range achieves higher accuracy than the Class AA PT sensor with a 1-point calibration. A small PCB including TI's TPD1E10B06 or TPD1E04U04 protection devices can be sealed into a RTD metal tube and meet the EN 61000-4-2 and -4-4 levels of ESD protection. The 64-bit internal EEPROM inside TMP116 stores user defined calibration data into the digital temperature sensor, simplifying integration with application MCUs, such as MSP430FR6047, FR6989 or CC13xx/26xx wireless MCU families.
# | Title | Duration | ||
---|---|---|---|---|
4.1 |
Digital temperature sensing with TMP116
In this video we will discuss how a digital temperature sensor with built-in calibration data memory can replace PT sensors in a -55 to 125ºC temperature...
|
06:34 | In this video we will discuss how a digital temperature sensor with built-in calibration data memory can replace PT sensors in a -55 to 125ºC temperature... |