sonbus SM1911M 4-20mA current temperature and humidity sensor User Manual
- June 5, 2024
- SONBUS
Table of Contents
sonbus SM1911M 4-20mA current temperature and humidity sensor
SM1911M using the standard DC4-20mA current output signal,easy access to PLC，DCS and other instruments or systems for monitoring temperature,humidity state quantities.The internal use of high-precision sensing core and related devices to ensure high reliability and excellent long-term stability,can be customized RS232,RS485,CAN,4-20mA,DC0~5V\10V,ZIGBEE,Lora,WIFI,GPRS and other output methods.
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℃ |
| Communication Interface | DC4~20mA |
| Power | DC12~24V 1A |
| Running temperature | -40~80°C |
| Working humidity | 5%RH~90%RH |
Wiring instructions
Any incorrect wiring can cause irreversible damage to the product. Please carefully wire the cable as follows in the case of power failure, and then connect the cable to confirm the correctness and then use it again.
| ID | Core color | Identification | Note |
|---|---|---|---|
| 1 | Red | V+ | Power V+ |
| 2 | Green | V- | Power V- |
| 3 | Yellow | I1+ | sensor 1 output |
| 4 | Blue | I2+ | sensor 2 output |
In the case of broken wires, wire the wires as shown in the figure. If the product itself has no leads, the core color is for reference.
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℃。
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。
Disclaimer
This document provides all information about the product, does not grant any license to intellectual property, does not express or imply, and prohibits any other means of granting any intellectual property rights, such as the statement of sales terms and conditions of this product, other issues. No liability is assumed. Furthermore, our company makes no warranties, express or implied, regarding the sale and use of this product, including the suitability for the specific use of the product, the marketability or the infringement liability for any patent, copyright or other intellectual property rights, etc. Product specifications and product descriptions may be modified at any time without notice.
Contact Us
- Company: Shanghai Sonbest Industrial Co., Ltd
- Address: Building 8,No.215 North east road,Baoshan District,Shanghai,China Web: http://www.sonbest.com
- Web: http://www.sonbus.com
- SKYPE: soobuu
- Email: [email protected]
- Tel: 86-021-51083595 / 66862055 / 66862075 / 66861077
References
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