DVU-Series

Supported Applications

The DVU and DVUT Series Vari-Angle® Digital Thermometers and Temperature Transmitters from Weiss Instruments provide accurate local and remote temperature monitoring for commercial and industrial HVAC systems. Designed for hydronic applications, these instruments combine the proven Vari-Angle® platform with digital temperature indication and optional 4-20mA output for building automation and process control systems.

Featuring fully light-powered LCD displays, the DVU and DVUT Series eliminate the need for batteries or external display wiring while delivering reliable performance in chilled water, condenser water, glycol, boiler, and air duct applications. The adjustable Vari-Angle® design allows flexible positioning for improved readability in piping systems and mechanical rooms.

Both series are manufactured in full conformance with Federal Specification GG-T-321D and are fully interchangeable with industrial glass thermometers, making them ideal for retrofits and replacement applications. The DVU Series provides accurate local temperature indication, while the DVUT Series adds a loop-powered 4-20mA transmitter for integration with BAS and HVAC control systems.

Operating Conditions & Performance

With switchable °F/°C operation, fast response times, and compatibility with standard thermowells, the DVU and DVUT Series provide a reliable solution for HVAC upgrades, building automation, and industrial temperature monitoring applications.

Every DVU instrument measures over a standard range of -50 to 300°F (-45 to 150°C), holding accuracy to the greater of 1% of reading or 1°F. Display updates every 10 seconds from a glass-passivated NTC thermistor sensor. Recalibration is available through a case potentiometer.

The instruments operate across an ambient range of -30 to 140°F (-35 to 60°C) at up to 100% humidity, with zero ambient temperature error. The stem is precision die-cast Zamac alloy — with a brass extension on 6" and longer stems — while the case, adjustable joint, and connecting thread are molded from hi-impact ABS. The DVUT transmitter is loop powered from 8 to 35 VDC, drives a 4-20mA signal and output accuracy of 0.1% of span.

Configuration Options

The DVU Series splits into two capability lines that share the same Vari-Angle body, range, and thermowell mounting but differ in how the reading is delivered:

• DVU digital thermometers — self-powered, fully light-powered local indicators that need no wiring or battery, giving a maintenance-free digital replacement for glass thermometers.
• DVUT self-indicating transmitters — combine the same local digital display with a loop-powered 4-20mA transmitter, providing both an at-a-glance reading and a remote signal from one device.

Within each line, models differ by stem length to match the insertion depth of the thermowell, and dedicated air-duct-stem versions are offered for HVAC duct sensing. Because both lines are built for thermowell connections only, the choice between them is driven by whether a remote output is required, not by any change in the sensing element.

Key Product Differences

The digital thermometer line follows the DVU – <Stem Length> ordering structure:

• DVU35 — 3½" stem
• DVU6 — 6" stem
• DVU9 — 9" stem
• DVU12 — 12" stem
• DVD6 — 6" air duct stem

The transmitter line mirrors it under the DVUT – <Stem Length> structure:

• DVUT35 — 3½" stem
• DVUT6 — 6" stem
• DVUT9 — 9" stem
• DVUT12 — 12" stem
• DVDT6 — 6" air duct stem

E Series thermowells are offered as accessories to complete an installation, selected to suit the chosen stem length.