ABB AU3048B Display & Operation Panel

Model：AU3048B

Official Classification：Display Operation Panel (Spare Part)

Compatible Device：ABB TTF300 Series Field-Mount Temperature Transmitter, Built-in Circular Display Module

⚠️ Important Note: Misleading information online. AU3048B is NOT a MOSFET, it is an LCD display unit dedicated for temperature transmitters.

Functions

1. Circular embedded structure, installed directly inside the housing of TTF300 transmitter
2. Equipped with LCD screen + 4 push-buttons
3. Functions: On-site reading of temperature measurement values, parameter configuration, zero calibration, fault code retrieval
4. Communication: Connected to transmitter mainboard via internal bus; no external terminals

Key Information

Standard Order Description: AU3048B, Display for TTF300

Application: Field replacement spare part; used when original panel blackouts or buttons fail

Compatibility: Only fits ABB TTF300. Not interchangeable with FEP, FXE, Deltapilot and other instrument series

Supply Note: Original OEM spare part; no domestic compatible alternatives available

Typical Fault Symptoms (Display Unit Failure)

LCD no backlight / black screen, while transmitter 4–20mA output remains normal

Buttons unresponsive; unable to access parameter menu

Screen distortion, incomplete character display

Procurement Verification Suggestion

Confirm transmitter model marked on nameplate is TTF300 before ordering.

Do not place orders if the model does not match; interface and communication protocol are incompatible.

Complete Technical Specification Document for ABB AU3048B

⚠️ Important Clarification: Multiple online sources mistakenly label AU3048B as power MOSFET.

AU3048B is original ABB spare part, full name: Display Unit AU3048B, Type B LCD Operation Display for TTF300 Temperature Transmitter

1. Basic Part Information
2. Model: AU3048B
3. Official Description: Display for TTF300 (LCD Operation Display Unit Type B for TTF300 Transmitter)
4. Product Category: ABB Measurement Instrument Spare Parts
5. Compatible Host: Only compatible with ABB TTF300 / TTF300-N Field-Mount Temperature Transmitter

❌ Incompatible with TTF200, FEP, FXE, Deltapilot and other instrument series

5. Standard English Order Description (can be sent directly to suppliers)

`AU3048B, LCD Display Module Type B for TTF300 Transmitter`

6. Country of Origin: China / Italy (depends on production batch)
7. Minimum Order Quantity: 1 piece
8. Electrical & Interface Specifications
9. Power Supply: No independent external power supply; powered via internal backplane bus from TTF300 transmitter
10. Interface: Dedicated board-to-board straight connector; no external wiring terminals
11. Communication Protocol: Proprietary internal serial bus; NOT HART / RS485. Cannot operate standalone
12. Power Consumption: Powered by host transmitter; typical additional power consumption ＜3mW
13. Display & Keypad Specifications
14. Display Type: Segment LCD with backlight
15. Display Capability

Numeric: 4 digits plus sign symbol, up to 2 decimal places

Extra elements: Bar graph, alarm status indicators, sensor diagnostic codes

Viewable data: Sensor 1 / Sensor 2 readings, electronics housing temperature, 4–20mA output percentage, fault diagnostic messages

3. Keypad Layout: 4 membrane keys (UP, DOWN, ENTER, ESC)
4. Operation Rights: Local parameter configuration, zero trimming, fault code reading, display page switching
5. Environmental Specifications (compliant with TTF300 transmitter specifications)

Explosion Protection Remark: The display module itself carries no Ex certification. Overall explosion protection rating depends on the complete TTF300 transmitter certificate (ATEX / IECEx).

5. Mechanical Dimensions & Construction
6. Outline: Circular embedded module, matching circular installation cavity of TTF300 transmitter housing
7. Housing Material: Flame-retardant ABS plastic
8. Mounting Method: Snap-fit installation by pushing into transmitter housing; no screws required
9. Ingress Protection: Front face achieves IP66/IP67 together with transmitter enclosure; bare PCB module rated IP20
10. Net Weight: Approx. 45 g
11. Supported Functions List
12. Cyclic display of dual temperature sensor values (dual Pt100 transmitter models)
13. Sensor drift monitoring and sensor redundancy status indication
14. NE107 standard diagnostic information; sensor open-circuit / short-circuit alarm codes
15. Display of transmitter 4–20mA output value and output percentage
16. Local basic configuration: engineering unit setup, damping, high/low alarm limits
17. On-site fault code reading without configuration software
18. Fault Identification Criteria (AU3048B hardware failure)
19. LCD blackout, no backlight; transmitter 4–20mA analog output works normally
20. Screen distortion, missing characters
21. All buttons non-functional, cannot enter configuration menu

✅ Differentiation Tip: Transmitter mainboard failure may also cause black screen. Check transmitter power supply and internal connector tightness before replacing display unit.

8. Critical Compatibility Restrictions
9. AU3048B ≠ AU3048A: Type A and Type B differ in firmware and pin assignment; not interchangeable
10. Only supports TTF300 hardware version ≥ HW 02.00.02; older hardware versions cannot recognize new display modules
11. Cannot be powered on and tested separately. Must be installed inside TTF300 transmitter for activation.
12. Replacement Information

No third-party domestic compatible substitutes; only original AU3048B spare part available

If local operation is unnecessary for TTF300 transmitter, the display can be removed and replaced with blank cover spare part