Honeywell UDC2800 Digital Controller

Fits 1/4 DIN panel process/temperature control where you need two universal analog inputs, Accutune III PID, and Bluetooth or Ethernet configuration.

Key advantages

Two universal analog inputs — TC/RTD/linear sampled 10×/s with math algorithms.
±0.15% FS typical — field-calibratable to ±0.05% FS typical; 16-bit resolution.
NEMA 4X / IP66 front — washdown face with dual display and Bluetooth status annunciation.
Flexible control map — relay/SSR/current/open-collector options; PID and duplex heat/cool.

Typical applications

1/4 DIN process and temperature loops needing dual universal inputs.
Panel upgrades that want Bluetooth status visibility on the UDC2800 family.
Heat/cool duplex control with optional current or SSR outputs.

Selection guide

Inputs — 2 universal analog inputs (TC/RTD/linear); sampled 10×/s; math algorithms; up to 4 output types + 2 digital inputs.
Accuracy — ±0.15% of full scale typical (±1 digit); field calibratable to ±0.05% FS typical; 16-bit resolution.
Output / control — Relay / SSR / current / open collector (transmitter power) options; PID, duplex heat/cool, alarms, timers, ramp/soak; Accutune III.
Supply — Universal 90–264 Vac 50/60 Hz; optional 24 Vac/dc.
IP — NEMA4X and IP66 front face (with screws); NEMA3R/IP54 alternate bezel note in OEM docs.
Display — Dual display; Bluetooth status annunciation.
Communication — Bluetooth configuration (EasySet); RS485 Modbus RTU or Ethernet 10/100 Base-T TCP/IP.
Mounting — 1/4 DIN panel mount; 4.5 in (114 mm) depth; plug-in chassis.
Notes — Document 51-52-03-49 technical specification harvested. Product manual not available as unauthenticated public PDF during harvest.

Common mistakes

Ordering Ethernet when the host only speaks RS485 Modbus (or the reverse).
Assuming IP66 without the screw-secured front face option called out in the OEM documentation.
Skipping duplex heat/cool output map when both heating and cooling contactors are present.
Expecting a published ambient operating band on this page — ambient detail sits in the OEM environmental section (not filled as a numeric band in our JSON).
Treating Accutune III / Bluetooth EasySet as optional accessories rather than order-code features to lock.
Automation & control · Automation & control buying guide

When to RFQ / what to tell us

Input types (2× TC/RTD/linear), control mode (PID / duplex), and output map (up to 4 outputs + 2 DI).
Supply (90–264 Vac or 24 Vac/dc) and front IP need (IP66 with screws vs alternate bezel).
Communication (Bluetooth EasySet / RS485 Modbus RTU / Ethernet TCP/IP).
Ramp/soak, timers, alarms; quantity; ship-to country.
Compatible with Honeywell UDC2800 1/4 DIN panels — we do not claim authorized-dealer status.

Request a Quote · Get selection help

Specs

Spec	Value
SKU	49324
Brand	Honeywell
Model	UDC2800
Product type	other (universal digital controller)
Measuring range	2 universal analog inputs (TC/RTD/linear); sampled 10×/s; math algorithms; up to 4 output types + 2 digital inputs
Accuracy	±0.15% of full scale typical (±1 digit); field calibratable to ±0.05% FS typical; 16-bit resolution
Output signal	Relay / SSR / current / open collector (transmitter power) options; PID, duplex heat/cool, alarms, timers, ramp/soak
Supply voltage	Universal 90–264 Vac 50/60 Hz; optional 24 Vac/dc
IP rating	NEMA4X and IP66 front face (with screws); NEMA3R/IP54 alternate bezel note in OEM docs
Ambient temperature	Panel-mounted industrial control equipment (see OEM documentation environmental section)
Display	Dual display; Bluetooth status annunciation
Communication	Bluetooth configuration (EasySet); RS485 Modbus RTU or Ethernet 10/100 Base-T TCP/IP
Approvals	NEMA4X / IP66 front; Accutune III
Mounting	1/4 DIN panel mount; 4.5 in (114 mm) depth; plug-in chassis
Notes	Document 51-52-03-49 technical specification harvested. Product manual not available as unauthenticated public PDF during harvest.

Documents

Honeywell UDC2800 technical specification (PDF)

FAQ

Q: How many inputs and what accuracy? A: 2 universal analog inputs sampled 10×/s; ±0.15% FS typical, field calibratable to ±0.05% FS typical.

Q: Which communication options? A: Bluetooth EasySet configuration; RS485 Modbus RTU or Ethernet 10/100 Base-T TCP/IP — lock on the order code.

Q: Panel size? A: 1/4 DIN panel mount, 4.5 in (114 mm) depth, plug-in chassis.

Q: What should I send for a quote? A: Input/output map, supply, protocol, IP bezel, quantity. Compatible with Honeywell UDC2800 — we do not claim authorized-dealer status.