Technical Parameters
| Technical parameter | Parameter value |
| Brand | SONBEST |
| Temperature measuring range | -30℃~80℃ |
| Temperature measuring accuracy | ±0.5℃ @25℃ |
| Humidity measuring range | 0~100%RH |
| Humidity accuracy | ±3%RH @25℃ |
| Interface | 2-wire 4-20mA |
| Power | DC12~24V 1A |
| Running temperature | -30~85℃ |
| Working humidity | 5%RH~90%RH |
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1. temperature and current computing relationship
For example, the range is -30~80℃, the analog output is 4~20mA current signal, temperature and current The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is temperature range upper limit, A1 is the lower limit of the range, B2 is current output range upper limit, B1 is the lower limit, X is the currently read temperature value, and C is the calculated current value. The list of commonly used values is as follows:
| current(mA) | temperatureValue (℃) | Calculation Process |
| 4 | -30 | (80-(-30))*(4-4)÷(20-4)+-30 |
| 5 | -23.125 | (80-(-30))*(5-4)÷(20-4)+-30 |
| 6 | -16.25 | (80-(-30))*(6-4)÷(20-4)+-30 |
| 7 | -9.375 | (80-(-30))*(7-4)÷(20-4)+-30 |
| 8 | -2.5 | (80-(-30))*(8-4)÷(20-4)+-30 |
| 9 | 4.375 | (80-(-30))*(9-4)÷(20-4)+-30 |
| 10 | 11.25 | (80-(-30))*(10-4)÷(20-4)+-30 |
| 11 | 18.125 | (80-(-30))*(11-4)÷(20-4)+-30 |
| 12 | 25 | (80-(-30))*(12-4)÷(20-4)+-30 |
| 13 | 31.875 | (80-(-30))*(13-4)÷(20-4)+-30 |
| 14 | 38.75 | (80-(-30))*(14-4)÷(20-4)+-30 |
| 15 | 45.625 | (80-(-30))*(15-4)÷(20-4)+-30 |
| 16 | 52.5 | (80-(-30))*(16-4)÷(20-4)+-30 |
| 17 | 59.375 | (80-(-30))*(17-4)÷(20-4)+-30 |
| 18 | 66.25 | (80-(-30))*(18-4)÷(20-4)+-30 |
| 19 | 73.125 | (80-(-30))*(19-4)÷(20-4)+-30 |
| 20 | 80 | (80-(-30))*(20-4)÷(20-4)+-30 |
As shown in the above formula, when measuring 8mA, current current is 31.5℃。
2. humidity and current computing relationship
For example, the range is 0~100%RH, the analog output is 4~20mA current signal, humidity and current The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is humidity range upper limit, A1 is the lower limit of the range, B2 is current output range upper limit, B1 is the lower limit, X is the currently read humidity value, and C is the calculated current value. The list of commonly used values is as follows:
| current(mA) | humidityValue (%RH) | Calculation Process |
| 4 | 0.0 | (100-0)*(4-4)÷(20-4)+0 |
| 5 | 6.3 | (100-0)*(5-4)÷(20-4)+0 |
| 6 | 12.5 | (100-0)*(6-4)÷(20-4)+0 |
| 7 | 18.8 | (100-0)*(7-4)÷(20-4)+0 |
| 8 | 25.0 | (100-0)*(8-4)÷(20-4)+0 |
| 9 | 31.3 | (100-0)*(9-4)÷(20-4)+0 |
| 10 | 37.5 | (100-0)*(10-4)÷(20-4)+0 |
| 11 | 43.8 | (100-0)*(11-4)÷(20-4)+0 |
| 12 | 50.0 | (100-0)*(12-4)÷(20-4)+0 |
| 13 | 56.3 | (100-0)*(13-4)÷(20-4)+0 |
| 14 | 62.5 | (100-0)*(14-4)÷(20-4)+0 |
| 15 | 68.8 | (100-0)*(15-4)÷(20-4)+0 |
| 16 | 75.0 | (100-0)*(16-4)÷(20-4)+0 |
| 17 | 81.3 | (100-0)*(17-4)÷(20-4)+0 |
| 18 | 87.5 | (100-0)*(18-4)÷(20-4)+0 |
| 19 | 93.8 | (100-0)*(19-4)÷(20-4)+0 |
| 20 | 100.0 | (100-0)*(20-4)÷(20-4)+0 |
As shown in the above formula, when measuring 8mA, current current is 29%RH。
