Prolon PL-T500-WGL Communicating Digital Wall Sensor
Overview
The Prolon PL-T500-WGL is a communicating digital wall sensor with a white enclosure, grey label, backlit graphical LCD and a setpoint knob mounted on a precision rotary encoder. It sends ambient zone temperature, heating and cooling setpoints and schedule override requests to its Prolon controller.
The infinitely turning knob has incremental detents that give mechanical feedback for precise setpoint adjustment. Holding the pushbutton for 3 seconds requests a schedule override, and double-clicking it changes the displayed unit between °F and °C. The sensor wires through a numbered screw terminal block (INT+, INT-, 24VAC, COM) or an RJ45 modular jack, and mounting hardware is included for drywall or a 2 x 4 in. electrical junction box.
Best For
- Prolon-controlled HVAC zones requiring local temperature display, setpoint adjustment and schedule override
- Zones served by Prolon C1050-VAV, C1050-FCU, M2000-FCU or VC2000 controllers
Warranty
For warranty terms on this Prolon product, contact ZOT Supply at sales@zotsupply.com or 855-825-2811.
Key Features
Built-in Temperature Sensor
10KΩ Type 3 NTC thermistor with 1% precision reports ambient zone temperature to the connected Prolon controller.
Backlit Graphical LCD
80x130 pixel oval-shaped screen with backlighting shows temperatures and setpoints.
Rotary Encoder Knob
Infinitely turning knob on a precision rotary encoder with incremental detents gives mechanical feedback for precise setpoint adjustment.
Override Pushbutton
Hold 3 seconds to send a schedule override request. Double-click to switch the displayed unit between °F and °C.
Communicating Sensor
Talks Modbus RTU over RS485 to the controller's interface (INT) port instead of sending conventional resistive signals, and does not occupy a network address.
Two Wiring Options
Numbered screw terminal block (16 AWG max) or RJ45 modular jack; mounting hardware included for drywall or a 2 x 4 in. box.
ZOT Supply is an authorized distributor of Prolon products.
Technical Specifications
| Supply | 24 VAC ±10%, 50/60 Hz |
|---|---|
| Power Consumption | 5 VA max |
| Temperature Sensor | 10KΩ Type 3 NTC thermistor, 1% precision |
| Inputs | None |
| Outputs | None |
| Screen | LCD 80x130 pixels with backlighting |
| Interface | Knob mounted on rotary encoder with detents and schedule override push-button |
| Schedule Override | Hold pushbutton 3 seconds |
| Display Unit | °F or °C; double-click pushbutton to change |
| Microprocessor | SyncMOS 8-bit, 11 MHz, 64KB Flash memory |
| Communication to Controller | Modbus RTU over RS485, to the controller's interface (INT) port |
| Network Address | Does not occupy a network address or count toward network device total |
| Connection | Screw-type terminal blocks (16 AWG max) and RJ45 modular jack |
| Face Dimensions | 3.23 x 4.96 in. (82 x 126 mm) |
| Weight | 0.5 lb (0.23 kg) |
| Environment | 32-122 °F (0-50 °C) |
| Mounting | Standard 2 x 4 in. electrical box; mounting hardware for drywall included |
| Enclosure / Label | White enclosure, grey label |
| Compliance | FCC CFR47 Part 15, Subpart B, Class B; ICES-003 Issue 5, CAN ICES-3 (B)/NMB-3(B); RoHS Directive (2002/95/EC) |
Specifications per Prolon Datasheet, Digital Sensor PL-T500, REV 7.1.1 (PL-DATA-T500-C/F-EN), and Prolon Quick Start Guide, VAV Controllers & Wall Sensors, REV 4.0, reviewed September 25, 2026.
Documentation
Frequently Asked Questions
Which controllers does the Prolon PL-T500-WGL work with?
It works with Prolon controllers that accept a digital wall sensor on their interface (INT) port, including the C1050-VAV, C1050-FCU, M2000-FCU and VC2000, sending them room temperature, setpoint and schedule override requests.
How is the PL-T500-WGL wired and powered?
Land the RS485 communication on INT+ and INT- and 24 VAC power on 24VAC and COM, or use the RJ45 modular jack. Power draw is 5 VA max; C1050-VAV and VC2000 controllers provide an extra 24 VAC and COM pair to simplify powering the sensor.
Does it use a network address?
No. It communicates only with its associated controller, so it does not occupy a network address or count toward the total network device count.
How do occupants override the schedule?
Hold the pushbutton for 3 seconds to send a schedule override request.
Can the display show Fahrenheit or Celsius?
Yes. Double-click the pushbutton to change the displayed unit between °F and °C.
How does the setpoint knob work?
The knob is mounted on a precision rotary encoder that turns infinitely, with incremental detents that give mechanical feedback as the setpoint is adjusted on the display.
What do the letters in PL-T500-WGL mean?
The suffix identifies the casing and label colors for this SKU. The PL-T500-WGL has a white enclosure with a grey label.
- Sensor Type:
- Wall Mount
- Temperature Element:
- 10K Type III
- Supported Protocols:
- Modbus RTU
- Humidity Element:
- None
- CO2 Element:
- None
- Setpoint:
- Setpoint
- Override:
- Override
- Display:
- LCD Display
