Digital ambient air-temperature sensor
Overview
The TempVue™20 provides even greater flexibility to customers wanting the next generation of air-temperature measurements. This sensor meets all relevant World Meteorological Organization (WMO) temperature recommendations, but with a digital output that ensures maximum flexibility to meet all application needs.
Designed with the customer in mind, the TempVue 20 easily interfaces with Campbell Scientific or third-party data loggers and fits a wide range of aspirated and passive temperature shields. The sensor comes with a short cable attached and terminates into an M12 connector, providing exceptional convenience, environmental protection, and data integrity for use in a variety of applications.
Read MoreBenefits and Features
- Status information, measurement averaging options, and calibration information onboard
- Meets all relevant temperature WMO recommendations
- High measurement stability over both time and temperature
- Incredibly easy to install or remove for calibration checks
- Durable and protected for even the harshest environmental conditions
- Calibration certificate included
Images
Detailed Description
The TempVue 20 consists of a wire-wrapped, four-wire Pt100 Resistance Temperature Detector (RTD) element encapsulated in an epoxy-filled, stainless-steel housing. The thin yet robust housing, combined with the Pt100 sensing element, provide a truly WMO-compliant sensor to meet the 20-second step response time with an ambient wind speed of only 1 m/s (3.3 ft/s). The digital TempVue 20 also gives users much more measurement confidence than an analog sensor is able to provide, such as status information and the removal of any hassles regarding calibration inputs.
The TempVue 20 has a maximum measurement uncertainty of only 0.3 Kelvin over the entire measurement range of -60° to +60°C, with only 0.1 Kelvin over the most common temperature range of -40° to +40°C.
Specifications
| Sensor Description | Platinum Resistance Thermometer (Pt100) |
| Measurement Uncertainty |
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| Temperature Measurement Range | -60° to +60°C (-76° to +140°F) |
| Time Constant in Air | 20 s for a wind speed of 1 m/s (3.3 ft/s) |
| Resolution | Two decimal places (0.01°C) |
| Connector Type | M12 (to extend beyond 1 m [3 ft] standard cable length) |
| Probe Diameter | 1.9 cm (0.75 in.) maximum |
| Probe Length | 12.1 cm (4.75 in.) tip to end of cable gland |
| Extended Probe Length | 18.1 cm (7.125 in.) tip to end of extender piece |
| Total Length | 97.16 cm (38.25 in.) tip to end of connector |
| Weight | 70 g (0.15 lb) for probe with extender piece, including standard 1 m (3 ft) cable with M12 connector |
Power |
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| Voltage Range | 6 to 16 Vdc |
| Current | 150 µA |
TempVue 20-SDI-12 |
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| SDI-12 Compatibility | Version 1.4 |
TempVue 20-Modbus |
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| Communications Protocol | Modbus RTU protocol (over RS-485) |
| Communications Format | 8 data bits, 1 stop bit, even parity as default |
| Baud Rate | 19,200 bps as default (user-configurable) |
Documents
Downloads
TempVue 20 Program Examples v.1 (3KB) 19-10-2023
Three example programs are available for the TempVue 20. The SDI-12 program uses the R0! SDI-12 instruction to retrieve the temperature measurement. A basic Modbus program retrieves both the Celsius and Fahrenheit temperature measurements from the TempVue 20. The advanced Modbus program retrieves the instantaneous measurements, averages, minimums, maximums, measurement period, red flags, serial number, operating system version, and model ID.
These programs are written for the CR1000X data logger, but programs for the other data loggers will be similar.
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