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Campbell Scientific - Model CS250DM - PT-1000 Class A -Precision Air Temperature Sensor with Digital Modbus RS-485 Output
The CS250DM is a PT-1000 Class-A air temperature sensor for temperature gradient and stability analysis. This sensor delivers extremely accurate and precise air temperature data that is necessary for IEC 61724 Class-A solar monitoring applications and Delta Temperature (ΔT) calculations. It also includes a digital Modbus RS-485 output, ensuring data quality over long cable lengths.
The CS250DM uses a precision PT-1000 class A platinum resistor thermometer (PRT) to provide the highest level of accuracy. The cable includes a Campbell Scientific precision analog-to-digital, smart-sensor module for making the measurements. The module design is optimized for the class A PRT that minimizes self-heating and lead-wire resistance. Measurement electronics are surge protected with 1200 V isolation and environmentally protected with a rugged overmolding with an IP65 rating.
When exposed to sunlight, the CS250DM should be housed in the RAD06 6-plate radiation shield.
- High accuracy and precision
- Exceeds IEC 61724-1 standards for ambient air temperature measurements
- Exceeds EPA standards for ΔT measurements
- Digital Modbus RS-485 output ensuring data quality over long cable lengths
- Best-in-class noise protection and isolation meet IEC Class 4 standards
- NIST-traceable, serialized calibration certificate supplied with every sensor
- Measurement Uncertainty: ±0.3°C
- Element Stem Material: 316L stainless steel sheathed
- Surge Protection: 1200 V isolation
- Supply Voltage: 5 to 30 Vdc
- Power Draw: 15 mA
- Temperature Coefficient: TCR = 3850 ppm/K
- Stem Diameter: 0.32 cm (0.125 in.)
- Overall Stem Length: 6.35 cm (2.5 in>0
- Sensor Dimensions: 17.15 x 11.13 x 6.05 cm (6.75 x 4.38 x 2.38 in.)
- Sensor Weight: 90.7 g (0.2 lb)
Sensing Element
- Precision: 1000 ohm Class A platinum (PT1000)
- Accuracy: ±(0.15 + 0.002t)°C
- Long-Term Stability: Maximum Ro drift = 0.04% after 1000 hours at 400°C
- Measurement Temperature Range: –75° to +250°C
- Time Constant: 15 seconds in 5 m/s wind
Communications
- Protocol: Modbus RTU protocol (over RS-485)
- Format: 8 data bits, 1 stop bit, even parity as default (user-configurable)
- Baud Rate: 19,200 bps as default (user-configurable)
- Modbus ID: Last two digits of serial number as default (user-configurable)
Cable (Sensor Head to DM Board)
- Wire Size and Type: 24 AWG (7/32,RT38) copper
- Insulation Type: PFA insulated (Teflon®)
- Insulation Rating: –75° to +250°C
- Sheath: Thin PFA sheathed overall
- Number of Cores: 3
- Physical Properties: Good abrasion and moisture resistance
- Overall Diameter: 2.1 mm (0.08 in.)
Cable (DM Board to PT)
- Wire Size and Type: 24 AWG (7/32) tinned copper
- Insulation Type: PVC
- UL: AWM 10012 1000V 105°C
- Filler: Fibrillated polypropylene as required for uniform round construction
- Drain: 24 AWG (7/32) tinned copper (cabled, touching foil)
- Shield: Aluminum/Mylar (100% coverage, 25% minimum overlap, foil facing in)
- Nominal Wire Diameter: 0.61 mm (0.024 in.)