PRODUCTS

Prism Gauge: Dual-Color Warning Optical Oil Level Monitoring System

The prism gauge employs optical refraction principles to monitor oil levels without requiring an external power supply, ensuring long-term stable operation. Its robust construction suits both high and low-temperature environments, and meets stringent precision requirements for equipment like transformers. When the oil level drops, changes in light refraction paths within the viewing window cause the front-facing dual-color rubber indicator strip to shift from black to red, visually indicating a low oil level status, thereby enhancing safety and reliability.

Prism gauge

An upright, nut-free prism gauge

The prism gauge without a nut lying flat on the desk.

A nut-free prism gauge lying flat

The prism gauge with a nut is positioned upright on the table.

Upright prism gauge

The prism gauge with a nut is lying flat on the table.

Horizontal prism gauge

Specification

Table 1: Specifications of Prism Gauge
Nut Material	Copper
Main Body Material	Acrylic
Indication System	Rubber color card, using black and red for easy color differentiation.
Operating Temperature	-20 °C to 150 °C
Operating Pressure	0.2 MPa
Connection Method	Threaded connection
Dimensions	Customizable based on model
Model numbers	ETLG1: Overall length is 3.16" ETLG2: Overall length is 6.16" ETLG3: Overall length is 7.16" Additional sizes can be customized.

Features

Easy to see black and red indication
Heavy-duty, one piece Brass body
Large viewing window
Indicates large liquid level span
Unique double seal design
Excellent light refraction from prismatic cone
Crystal clear, polished optical rod
Positive high and low indication
Large wrench flats
Precision 1" – 11 1/2 NPT threaded mounting for top side application

Structure

Copper hex nut: The threaded interface ensures a proper seal.
Clear acrylic tube: Corrosion-resistant with excellent light transmission, featuring a red warning zone at the bottom.
Rubber color chart: Attached at the bottom of the window, it triggers color changes based on variations in oil level.

Prism gauge product and its structural component names

Prism gauge structure

Application

Transformer oil level monitoring: Real-time detection of insulation oil reserves to prevent overheating or failure due to low oil levels, suitable for outdoor substations, industrial power systems, and other applications.

Monitoring of transformer oil levels

An array of tubular gauge glass is vertically placed on the desk.

Something you want to ask?