Next Temperature Sensor Configuration & Installation Guide

Overview

The Next Wi-Fi Standard Temperature Sensor uses a Negative Temperature Coefficient (NTC) thermistor to measure temperature. When measuring, the sensor momentarily energizes the thermistor in series with a precision resistor, producing a voltage directly proportional to the temperature. The sensor converts the analog voltage signal to a digital value and calculates the temperature.

Settings to Configure

The instructions to configure standard Next Sensor and Wi-Fi network settings are available in the Next Sensor Quick Start Guide. The settings below are specific to the Next Temperature Sensor:

Below—Temperatures measured below this value will cause the sensor to enter the Aware State.
Above—Temperatures measured above this value will cause the sensor to enter the Aware State.
Aware State Buffer—Prevents the sensor from bouncing between Standard Operation and Aware State when readings are very close to a threshold.

For example, if you set a Maximum Threshold (Above) to 90° and a Hysteresis of 1°, once the sensor takes an assessment of 90.0° and enters the Aware State, it will remain in the Aware State until the temperature drops to 89.0°.

Similarly, at the Minimum Threshold (Below), the temperature must rise a degree above the threshold to return to Standard Operation.

Calibration

The Next Temperature Sensor has two calibration ranges to improve accuracy:

Range 1: Adjusts accuracy from -40°C to 58°C (ideal at 7°C).
Range 2: Adjusts accuracy from 58°C to 125°C (ideal at 114°C).

We recommend calibrating between -30°C and 20°C for Range 1 and 90°C and 120°C for Range 2. Calibrating outside of these ranges may reduce accuracy in other temperature ranges.

Calibration Steps:

Place the temperature lead in a stable temperature environment within one of the recommended ranges until the readings stabilize.
Enter the actual temperature in the text box and press Calibrate.
Keep the sensor at a stable temperature until a Calibration Success/Fail message appears in the readings.

Sensor Scale Settings

To adjust the sensor scale settings:

Click the scale icon at the far right of the top menu in iMonnit.

With the Next Temperature Sensor, you can display temperature values in either:

Fahrenheit
Celsius

Installation Steps

Step 1:

Follow the installation and setup steps in the Next Wi-Fi Sensor General Information Guide.

Step 2:

Configure the sensor's settings and scale information in iMonnit for your specific application or use case.

Step 3:

Route or place the lead as needed.

Troubleshooting

Symptoms	Detailed Problem Description	Solution
Hardware Error is Reported in iMonnit	The sensor base can't communicate with the measurement circuitry. STS is set to 2.	This condition is caused by the lead temperature being out of range of the sensor(-40°C to +125°C) or by an internal hardware failure. If this condition occurs all the time, try setting default configurations. If a hardware error occurs occasionally, move the temperature lead into a room-temperature environment. If the problem persists, contact Monnit Technical Support for further guidance.
Calibration Failed is Reported in iMonnit	The previous calibration or temperature reading failed.	Before calibrating the sensor, ensure it is in a stable temperature environment and within the correct range. (Range1 between -30°C and 20°C ideal at 7°C, Range 2 between 90°C and 120°C ideal at 114°C) Ensure the sensor lead is at a constant temperature during the previous five reported measurements—stable (within 0.5°C or each other). A faster Heartbeat is useful when calibrating to ensure the temperature stays consistent. With these conditions met, the calibration should be successful. If the problem persists, contact Monnit Technical Support for further guidance.