High Quality   •   UK Made   •   100% Submersible   •   Worldwide Dispatch USA +EU

Key Features

🌊 IP68 Rated for Continuous Submersion
💧 Designed for Water & Industrial Liquids
📡 4–20 mA 2-Wire Current Loop — reliable signal over long cable runs
🎯 PT100 Precision Sensing Element
🛡️ 316 Stainless Steel or Marine Bronze Housing
📏 Up to 150 m Submersible Cable Rating
⚙️ Custom Temperature Ranges Available
🚚 UK Supplier • Technical Support Available

PT100 element is converted to 4-20mA current loop using internal Signal conditioning electronics.

Lead times on this product is 1-2 weeks get in touch for any questions or customisations

Technical Specifications

• Temperature Measurement Range: 0 to 35°C (32 to 95°F), 0 to 50°C (32 to 122°F), 0 to 100°C (32 to 212°F), or −10 to 60°C (14 to 140°F). Custom temperature ranges available.
• Output Signal: 4–20 mA, 2-wire current loop
• Supply Voltage: 10–32 VDC
• Accuracy: ±0.5% of full scale or 5 µA, whichever is greater
• Electrical Connection: IP68 submersible cable, rated for depths up to 150 metres
• Pressure Rating: Up to 5 bar (72.5 psi), equivalent to approximately 50 mH₂O / 164 ftH₂O
• Probe Diameter: 25 mm
• Housing Options: 316 stainless steel or CA104 marine bronze
• Cable Options: PUR, TPE-U or FEP
• Media Compatibility: Suitable for water and industrial liquid applications; seawater-compatible options available
• Output Configuration: 4–20 mA output can be re-scaled using the PC/laptop software interface
• Custom Options: Custom temperature ranges, cable configurations and seawater-compatible versions available

OST-26 Submersible Sensor Video in Pool

OST-26 4-20mA Description

The STT-26 Submersible temperature transmitter has been designed to be permanently submersed in liquids and suspended by its cable making installation very simple. The housing is available in either stainless steel or marine bronze to ensure complete compatibility with the media.

The temperature measuring element is a resistance thermometer and is secured in place with solid epoxy potting in the body of the sensor, to ensure the quickest response time to temperature changes. The sensing element is paired with accurate amplifier electronics to produce a 4-20mA output scale over your desired temperature range.

The device can also be rescaled to measure over a different temperature range using the ‘User Configuration Interface’ and simply connect the output wires to the device, interface to the PC/Laptop USB port and use the free software supplied.

4-20mA V Temperature Examples

Example 4-20mA output 0-35°C

Example 4-20mA output 0-100°C

Temp	0°C	25°C	50°C	75°C	50°C
OST26 mA Output	4mA	8mA	12mA	16mA	20mA

How to Connect to to a current meter

Why Buy From OnlineSensors Ltd?

When you're buying an industrial temperature senso you need confidence that you're getting the right specification, reliable support and dependable service.

🚚 UK Supplier & Fast Dispatch
Orders supplied from the UK with fast, reliable delivery.

🛠️ Technical Support
Need help choosing the correct temperature range, cable or housing? Our team is here to help.

⚙️ Custom Sensor Options
Custom temperature ranges, cable configurations and seawater-compatible options are available.

🔍 Quality Components
We supply carefully specified sensors designed for demanding industrial and monitoring applications.

📋 Clear Technical Specifications
Detailed specifications help you select the correct sensor for your application before ordering.

🔒 Secure Online Checkout
Your payment is processed securely through our online checkout.

💬 Support Before & After Purchase
We're here to help with product selection, technical questions and after-sales support.

Need a Custom Specification?

Not sure which version you need? Contact us before ordering. We can help you select the appropriate temperature range, output, housing material, cable and application configuration.