# Temperature, humidity, DI or 4–20 mA: choose by what you measure — ManThink

> For new monitoring points, choose by temperature, humidity, leaks or air quality. For existing instruments, start with dry-contact, current or voltage outputs. Confirm the signal type first, then channels, power and configuration.

Canonical: https://www.manthink.cn/en/resources/sensor-interface-selection/

Selection guides / Sensors · DI · 4–20 mA

For new monitoring points, choose by temperature, humidity, leaks or air quality. For existing instruments, start with dry-contact, current or voltage outputs. Confirm the signal type first, then channels, power and configuration.

Based on official product documentation  ·  Updated 2026-09-25

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## New measurements or existing signals?

For a new monitoring point, first specify the physical quantity: room temperature and humidity, water on the floor or air quality, for example. For existing equipment, inspect its wiring and manual to identify the signals it can output.

For example, a pressure instrument measures pressure while KS31 acquires its analog output. Distinguish the field probe from the signal-acquisition device; an analog collector does not contain every possible sensing probe.

## Match requirements to interfaces and models

KS31 current and voltage inputs are different configurations. KS32 dry-contact inputs are not direct substitutes for active voltage inputs. Confirm the site signal, then follow the corresponding wiring instructions.

| Site requirement | Model | Key checks |
| --- | --- | --- |
| Temperature/humidity, optionally with leak detection | KS52 | Spot/rope probes and order configuration |
| Air-quality monitoring | KS61 | Actual measurements, ranges and power configuration |
| Switch states and dry-contact feedback | KS32 | Contact type, channels and wiring conditions |
| Instrument current or voltage output | KS31 | The matching 4–20 mA or 0–10 V configuration |

## Other decisive specifications

- Whether the measurement range and accuracy meet operational needs.
- Required input channels and whether probes and accessories are included.
- Battery or external power, acquisition and reporting intervals.
- Installation location, operating environment and protection requirements.
- Whether the device frequency band matches the site’s LoRaWAN network.

Do not rely on model prefixes alone. Keep records of site outputs and wiring and check each requirement against the exact product page to avoid discovering incompatible interfaces during installation.

## Sources

Refer to the corresponding official documentation and confirmed configuration for exact models, interfaces and options.

- [KS52 Official manual](https://www.think-link.net/docs/zh/Device/LoRaWANSensor/ks52)
- [KS61 Official manual](https://www.think-link.net/docs/zh/Device/LoRaWANSensor/ks61)
- [KS32 Official manual](https://www.think-link.net/docs/zh/Device/LoRaWANSensor/ks32)
- [KS31 Official manual](https://www.think-link.net/docs/zh/Device/LoRaWANSensor/ks31)

## Related products

[Explore products ↗](https://www.manthink.cn/en/products/)

[![KS52 — product image](https://www.manthink.cn/assets/ks52.png)
**KS52**  Temperature, humidity & leak sensor](https://www.manthink.cn/en/products/sensors/ks52/) [![KS61 — product image](https://www.manthink.cn/assets/ks61.png)
**KS61**  86-box indoor environment monitor](https://www.manthink.cn/en/products/sensors/ks61/) [![KS32 — product image](https://www.manthink.cn/assets/ks32.png)
**KS32**  Six-channel dry-contact collector](https://www.manthink.cn/en/products/sensors/ks32/) [![KS31 — product image](https://www.manthink.cn/assets/ks31.png)
**KS31**  Four-channel analog collector](https://www.manthink.cn/en/products/sensors/ks31/)

Confirm your selection against the site’s interfaces and installation conditions.

[Discuss product selection ↗](mailto:info@manthink.cn?subject=Temperature%2C+humidity%2C+DI+or+4%E2%80%9320+mA%3A+choose+by+what+you+measure+%C2%B7+Product+selection+inquiry&body=)