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Overview
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.
Read MoreBenefits and Features
- 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
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Technical Description
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.
Specifications
| 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 |
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| Precision | 1000 ohm Class A platinum (Pt 1000) |
| 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) |
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| 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.) |
Resources and Links
Downloads
CS250DM Example Program v.1 (1 KB) 07-12-2020
The example CR6 program measures four CS250DM sensors, averages the four temperature measurements, and calculates the standard deviation of the four sensors.
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