Top-oil temperature indication for oil-immersed transformers
Provides a clear local reading of transformer top-oil temperature at the specified thermometer pocket.
Oil Temperature Indicators manufacturer and supplier
BWY2 Transformer Oil Temperature Indicator
An OTI gauge for transformer top-oil temperature indication, adjustable cooling and alarm contacts, and remote measurement output.
What the BWY2 Does
See how this model supports temperature indication, control contacts and remote monitoring.
Two to four adjustable contacts for cooling and alarm functions
Use the adjustable contacts to start cooling equipment or trigger a high-oil-temperature alarm.
Pt100 output with optional 4-20 mA and remote display configurations
Connect the oil temperature reading to a compatible remote display, PLC or SCADA system.
BWY2 Technical Specifications
Use these values to compare models. Request the latest datasheet and drawing for the exact suffix you plan to order.
| Operating ambient | -40°C to +80°C |
|---|---|
| Relative humidity | Up to 95% at 25°C |
| Measuring range | -20°C to 140°C |
| Accuracy | Class 1.5; stated maximum error ±2.4°C |
| Switch contacts | 2-4 adjustable contacts |
| Switch rated power | AC 220 V / 5 A |
| Temperature bulb | Φ14 × 150 mm |
| Mounting thread | M27 × 2 mm |
| Remote signal options | Pt100; 4-20 mA by selected configuration |
| Protection grade | IP55 |
BWY2 Product Overview
The BWY2 oil temperature indicator, or OTI gauge, measures the temperature at a transformer top-oil pocket. It provides a local pointer display and can operate adjustable contacts for cooling stages or an over-temperature alarm. A Pt100 output supports remote indication, while selected configurations can provide a transmitter or digital display.
Top-oil temperature is an important thermal operating value, but it is not the same as winding hot-spot temperature. The OTI records the oil condition at its sensing pocket. A WTI adds a load-dependent simulated rise. This distinction should remain clear in specifications, panel labels and alarm philosophy.
How the BWY2 Measures Temperature
A sealed sensing system links the temperature bulb, capillary and elastic measuring element. Temperature changes alter the sensing medium and move the indicator mechanism. Adjustable microswitches change state when the pointer mechanism reaches their configured set points.
The bulb is normally inserted into a thermometer pocket in the top-oil region. The pocket arrangement and thermal interface affect response. The selected capillary length must reach the mounting position without tight bends or unsupported loops.
Selecting the Correct BWY2
Confirm the full BWY2 model, measuring scale, switch quantity, contact use, output signal, capillary length, bulb and thread, mounting layout and need for a remote display.
For replacement work, compare the existing dial scale, terminal diagram and dimensions. Similar-looking BWY and BWY2 variants can use different contacts or output arrangements.
BWY2 Installation and Commissioning
Fill or prepare the thermometer pocket according to the transformer design and insert the bulb to its intended depth. Fix the instrument vertically and route the capillary with mechanical protection.
Test the pointer response, adjustable contacts and Pt100 or transmitter loop before the transformer enters service. Record the final set points and terminal assignments in the commissioning file.
Where the BWY2 Is Used
Transformer top-oil temperature indication
Radiator fan and pump control
High oil temperature alarm
Remote oil temperature display
Related BWY2 Selection Resources
Compare the Product Category
Review other models for the same transformer temperature measurement and control function.
Compare oil temperature indicatorsPlan Cooling, Alarm and Trip Control
Review how OTI and WTI contacts support transformer cooling stages and protection logic.
Transformer cooling and protection applicationPrepare a Replacement
Compare existing codes, outputs, capillary routing and mounting interfaces before a controller replacement.
Transformer OTI and WTI replacement guideReview Supplier Documents
Check available management-system, conformity and qualification materials for procurement review.
Certification and qualification documentsSales and engineering support
Request BWY2 Datasheet and Pricing
Tell us the transformer type, required temperature range, contact functions, output signal, capillary length, quantity and destination. We will help you identify a suitable model and send the available technical documents.