GE AT868 AquaTrans Ultrasonic Flow Meter Field Maintenance and Troubleshooting Guide

Chapter 7: External Reset Switch and Communication Interface Configuration

7.1 Configure external accumulator reset switch

Hardware connection: Connect the normally open button provided by the user to GATE+and GATE - on the terminal board.

Software configuration:

GLOBL → SYSTM → GATE OPTION：

Select RESET: Press the switch to reset the accumulated value and re accumulate it.

Select HOLD: Accumulate pause when the switch is pressed, resume when released.

7.2 RS232/RS485 Communication Settings

Standard RS232 (DTE device):

Use cross cables (TX → RX, RX → TX, GND → GND).

Enter GLOBL → COMM, set Meter Address=1 (or match with PC software), Baud Rate=9600 or 19200.

RS485 multi machine networking:

External converters (such as INMAC Model 800052) or ordering the original RS485 version are required.

Wiring: TMT+→ RX, TMT - → TX.

All slave addresses must be unique.

Chapter 8: Preventive Maintenance Suggestions

To ensure the long-term stable operation of AT868, it is recommended to perform the following checks every 6 months:

Signal strength record: Save SS up/dn, Q value, AMP value, and observe trend changes.

Simulation output linearity verification: Use the 3-point method (4mA, 12mA, 20mA).

Accumulator error test: Compare the accumulated quantity with a standard volume tank or higher precision flow meter.

External wiring inspection: Tighten all terminals and check if the cable sheath is aging.

Firmware version confirmation: Log in to the GE/Baker Hughes official website and check if there are patches for specific errors.