General Description

2. Main Features

• Model: UT2800-1/HB

• Built-in HB High Alarm function fixed configuration

• Universal sensor input: Thermocouple K,J,E,T,N,R,S,B; RTD Pt100; DC 4–20mA, 0–10V

• Dual LED digital display: PV / SP value simultaneous display

• ON/OFF control + PID auto-tuning

• High limit alarm relay output (HB dedicated)

• Power supply: 100–240 VAC 50/60Hz

• 1/4 DIN panel size: 96×96mm

• Anti-interference design, suitable for industrial site environment

3. Safety Precautions

• Disconnect power before wiring and installation.

• Use separate wiring for signal line and power line, avoid high voltage interference.

• Do not install in places with strong vibration, corrosive gas, direct sunlight or condensation.

• Only professional personnel can perform wiring and parameter setting.

• Do not disassemble the unit privately; no user serviceable parts inside.

4. Installation & Mounting

1. Panel cutout size: 92×92 mm

2. Panel thickness: 1–5 mm

3. Insert UT2800-1/HB from front of panel

4. Fix with mounting brackets at the rear, fasten screws firmly

5. Keep the front panel flush and stable

5. Terminal Wiring Definition

1. Power terminal: Connect 100–240 VAC

2. Sensor input terminal: Thermocouple / Pt100 / analog signal input

3. HB Alarm output terminal: Relay contact for high limit alarm, connect buzzer, indicator light or external interlock

4. Common ground terminal: Signal ground connection

6. Front Panel Key Operation

• SET key: Enter parameter menu / confirm setting

• ▲ ▼ key: Adjust value, select parameter item

• ◀ key: Shift cursor

• PV display: Process actual temperature/value

• SP display: Set target value / parameter code

• HB alarm indicator: Lights up when high limit alarm is triggered

7. Basic Operation

Power on

Set target temperature (SP)

1. Press SET briefly, SP value flashes

2. Use ▲ ▼ to modify set value

3. Press SET or ENT to save and exit

Enter parameter setting menu

1. Press and hold SET for 3 seconds to enter system parameter group

2. Press ▲ ▼ to select parameter code

3. Press SET to enter modification

4. Adjust value with ▲ ▼

5. Press SET to save

6. Hold SET 3 seconds again to quit menu mode

8. UT2800-1/HB Special HB Parameter

• HB.L: High alarm limit value

• HB.HY: Alarm hysteresis difference

• HB.MD: Alarm action mode (normally open / normally closed)

  When PV value exceeds HB.L setting, relay acts and HB alarm lamp lights up.

9. Input Type Selection

• K, J, E, T, N, R, S, B = Thermocouple

• Pt100 = RTD temperature sensor

• 4–20mA / 0–10V = Analog linear input

10. Error Code

• Err 01: Sensor open circuit

• Err 02: Input over range

• Err 03: Input under range

• Err 04: Internal hardware fault

• Err 05: HB alarm loop abnormal

11. Specifications

• Model: UT2800-1/HB

• Input: Universal TC / RTD / DC current & voltage

• Control mode: ON/OFF / PID auto tuning

• Alarm: Built-in HB high limit alarm relay

• Accuracy: ±0.1% FS

• Power: 100–240 VAC 50/60Hz

• Display: Dual 4-digit LED

• Dimension: 96×96×100 mm

• Working temperature: 0～50℃

• Humidity: 10～90% RH non-condensing

12. Maintenance

• Clean front panel with soft dry cloth only

• Do not use solvent or water to clean the unit

• Regularly check terminal wiring for looseness

• Calibrate once a year for precision measurement occasion