Prolon PL-T200A-WGL Communicating Digital Wall Sensor
Overview
The Prolon PL-T200A-WGL is a communicating digital wall sensor with a white enclosure, grey label and a setpoint knob with a printed +/- scale. It sends ambient zone temperature, heating and cooling setpoints and schedule override requests to its Prolon controller over Modbus RTU (RS485).
A built-in 10KΩ Type 3 NTC thermistor with 1% precision measures the zone, and an embossed momentary pushbutton overrides unoccupied status. The low profile enclosure wires through a numbered screw terminal block or an RJ45 modular jack, and mounting hardware is included for drywall or a standard 2 x 4 in. electrical box.
Best For
- Classrooms, hotels, executive areas, office spaces and other commercial areas
- Zones served by Prolon C1050-VAV, C1050-FCU, M2000-FCU or VC2000 controllers
- Spaces where occupants adjust setpoint with a +/- knob and override the schedule
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.
Setpoint Knob
Rotary knob with a printed +/- scale on a standard 10KΩ setpoint potentiometer, +/- 20% tolerance across the range, sends heating and cooling setpoint adjustments to the controller.
Override Pushbutton
Embossed momentary pushbutton sends a schedule override request to override unoccupied status. Hold for 3 seconds.
Communicating, No Network Address
Talks to its associated controller over Modbus RTU (RS485) at 57600 bps instead of sending a resistive signal, without occupying a network address.
Two Wiring Options
Numbered screw terminal block (INT+, INT-, 24VAC, COM) or RJ45 modular jack.
Low Profile Enclosure
Mounting hardware included for drywall or a standard single-gang (2 x 4 in.) electrical box.
ZOT Supply is an authorized distributor of Prolon products.
Technical Specifications
| Supply | 24 VAC ±10%, 50/60 Hz |
|---|---|
| Power Consumption | 2 VA max |
| Temperature Sensor | 10KΩ Type 3 NTC thermistor, 1% precision |
| Setpoint Adjustment | Rotary knob with printed +/- scale; standard 10KΩ setpoint potentiometer, +/- 20% tolerance across the range |
| Schedule Override | Embossed momentary pushbutton; hold 3 seconds |
| Interface | Rotary knob and schedule override push-button |
| Microprocessor | SyncMOS 8-bit, 11 MHz, 64KB Flash memory |
| Communication to Controller | Modbus RTU (RS485), 57600 bps |
| 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 | 0.35 lb (0.16 kg) |
| Environment | 32-122 °F (0-50 °C) |
| Mounting | Standard 2 x 4 in. electrical box; mounting hardware for drywall or single-gang box 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 verified against Prolon Digital Sensor PL-T200 Datasheet, REV 7.1.2 (PL-DATA-T200-C/F-EN), and the current Prolon PL-T200 product page, reviewed September 25, 2026.
Documentation
Frequently Asked Questions
Which controllers does the Prolon PL-T200A-WGL work with?
It works with Prolon controllers that accept a digital wall sensor, including the C1050-VAV, C1050-FCU, M2000-FCU and VC2000, sending them room temperature, room setpoint and schedule override requests.
How is the PL-T200A-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 2 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 embossed pushbutton for 3 seconds to send a schedule override request that overrides unoccupied status.
What does the +/- scale mean?
The PL-T200A knob is printed with a +/- scale instead of degrees. Set the connected controller's scale limits to match the sensor's scale.
What do the letters in PL-T200A-WGL mean?
The letter after T200 sets the setpoint knob: C = Celsius (15-30 °C), F = Fahrenheit (59-86 °F), A = +/- scale, B = no setpoint knob. The PL-T200A-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:
- No Display
