Car Water Temperature Sensor 12mm to 21mm NPT Thread | Automotive Coolant Temp Gauge Sensor

This water temperature sensor provides accurate coolant temperature readings for your vehicle. It is designed to work with water temperature gauges and alarm systems, giving you reliable engine temperature monitoring.

This sensor operates by measuring coolant temperature through resistance changes. When the water temperature is higher, the resistance value is lower. When the water temperature is lower, the resistance value is higher. The sensor has a working range of 0-120 degrees Celsius.

It includes a built-in alarm function. The alarm temperature is set at 97 +/- 2 degrees Celsius. When the coolant reaches the alarm temperature, the alarm switch closes and an alarm light will turn on. When the temperature decreases and the alarm switch turns off, the alarm light turns off. The response time at the alarm temperature is approximately 1 second.

The sensor has two wires. One wire connects to the water temperature gauge to display temperature readings. The other wire connects to the alarm switch for temperature alerts.

Key Features and Benefits

- Multiple thread size options (12mm, 14mm, 16mm, 17mm, 21mm) that fit various engine ports and adapters

• Built-in alarm function at 97 +/- 2 degrees Celsius that provides fast temperature warnings for engine protection

• 0-120 degree working range that covers normal engine operating temperatures

• Two-wire design that allows simultaneous gauge display and alarm connection

• Fast 1-second response time at alarm temperature that alerts you quickly to overheating

Who Is This For

- Car enthusiasts installing or replacing aftermarket water temperature gauges

• Mechanics working on engine cooling system repairs or upgrades

• Vehicle owners who want an added temperature alarm for engine protection

• Racing or off-road vehicle builders needing reliable coolant monitoring

Usage Scenario

Mark noticed his older truck's temperature gauge was reading inconsistently during summer drives. He replaced the old sensor with this water temperature sensor in the 17mm / 3/8 NPT size. Now his gauge shows accurate coolant temperature, and the built-in alarm gives him peace of mind that he will know immediately if the engine starts to overheat.

Micro Comparison

Unlike basic temperature senders that only provide gauge readings, this sensor includes an integrated alarm switch for overheating alerts. The multiple thread size options make it easier to find a match for your specific engine port without needing additional adapters.

Specifications

- Working range: 0-120 degrees Celsius

• Alarm temperature: 97 +/- 2 degrees Celsius

• Response time at alarm temperature: approximately 1 second

• Thread options: 12mm, 14mm, 16mm, 17mm, 21mm

• Thread standards: 14mm = 1/4 NPT, 17mm = 3/8 NPT, 21mm = 1/2 NPT

• Wires: 2 wires (one for gauge, one for alarm)

Package Includes

- 1x Water Temperature Sensor

Why You Will Love It

You will get accurate coolant temperature data and an early warning system in one compact sensor. The straightforward two-wire installation means you can have it connected to your gauge and alarm system quickly. It is a practical upgrade for anyone who values engine health and wants to avoid costly overheating damage.

Questions and Answers

Question: What temperature does the alarm trigger at?

Answer: The alarm triggers at 97 +/- 2 degrees Celsius.

Question: How many wires does this sensor have?

Answer: This sensor has two wires. One connects to the water temperature gauge and the other connects to the alarm switch.

Question: What thread sizes are available?

Answer: Available thread sizes are 12mm, 14mm, 16mm, 17mm, and 21mm. The 14mm size equals 1/4 NPT, 17mm equals 3/8 NPT, and 21mm equals 1/2 NPT.

Question: What is the working temperature range?

Answer: The working range is 0 to 120 degrees Celsius.

Question: How fast does the alarm respond when the temperature reaches the alarm point?

Answer: The response time at the alarm temperature is approximately 1 second.