GE AT868 AquaTrans ™ Single/dual channel ultrasonic water flow transmitter

Product basic information

GE AT868 AquaTrans ™ This is a single/dual channel ultrasonic water flow transmitter, measured using the correlation time difference method, with a protection level of NEMA 4X/IP66, dimensions of 6 × 4 × 3 in (152.4 × 101.6 × 76.2 mm), and a weight of 2.2 lb (1 kg).

Core specifications 

Project parameters

Power supply 85-265 VAC (47-65 Hz)/12-28 VDC

Maximum power consumption of 10 W

Measurement range -40~40 ft/s (-12.2~12.2 m/s)

Range ratio 400:1

Accuracy>6 inches for pipelines: ± 0.5%~2%; ≤ 6 inch pipeline: ± 2%~5%

Repetitive insertion type ± 0.2% FS; clamping type ± 0.2%~0.5% FS

Environmental temperature -10~55 ℃ (working); -40~70 ℃ (storage)

Output 1 isolated 4-20 mA (maximum 600 Ω); 1-channel pulse/frequency output (0.1~10 kHz)

Communication standard RS232; Optional RS485

Installation requirements

Site selection requirements

Sensor upstream * * ≥ 10 times diameter straight pipe section, downstream ≥ 5 times diameter * * straight pipe section

Install the horizontal tube sensor on the side to avoid air accumulation at the top/slag accumulation at the bottom

The instrument box is installed nearby, and the sensor cable is up to 1000 ft (300 m) long

Wiring specifications

Power supply: The longest grounding pin is equipped with a visible power-off switch (EU LVD) within 1.8 meters

Sensor: The length difference of cables in the same channel is ≤ 4 inches (10 cm) (≤ 2 MHz); ≤0.5 in(1.25 cm)（＞2 MHz）

Analog quantity: load ＜ 600 Ω

Pulse output: External power supply is prohibited

CE compliance: All cables are shielded and grounded, with free holes sealed.

Programming configuration (core steps)

Channel activation: CHx ACTIV is set to TRANS to enable the channel

System unit: CHx SYSTM Set volume/cumulative/mass flow units and decimal places

Pipeline parameters (CHx PIPE)

Material: Steel/Cast Iron/Copper/Aluminum/Plastic/Other (Input Sound Speed)

Outer diameter, wall thickness, path length P, axial length L

Lining: Material, Sound Velocity, Thickness

Fluid: Water (0-100 ℃/0-260 ℃)/Oil/Other (Input Sound Velocity)

Signal threshold (CHx SETUP-SIGNL)

Signal low limit: 40

Related peak value: 100

Sound speed deviation: ± 20%

Speed range: -40~40 ft/s

Acceleration limit: 15 ft/s ²

Global Settings (GLOBL)

System units: Imperial/Metric

Error handling: Keep output/Stop accumulation

Communication: Address 1, baud rate 9600

Display: Loop displays up to 4 parameters

Display and operation

LCD adjustment: adjust backlight and contrast through potentiometer

Accumulated amount reset: panel button/external switch/PanaView software

Measurement control: Only PanaView supports pausing/restarting measurements

Calibration process

Analog calibration

Low point: 4 mA

High point: 20 mA

Linear testing: 0-100% segmented verification, error ≤ ± 0.005 mA

Frequency/pulse output

Frequency: 10-100000 Hz

Pulse: minimum conductivity of 50 μ s, set unit/pulse

Error codes and diagnosis

Common Error Codes (Table)

Root cause handling of code issues

E1 low signal cable/sensor/flow slot fault inspection wiring and coupling

E2 Sound Speed Error Parameter/Flow State Anomaly Check Sound Speed and Adjust Sensor

E3 speed exceeds the range, flow rate exceeds the set adjustment range threshold

E4 signal quality poor interference/poor alignment troubleshooting electromagnetic interference

E5 amplitude abnormal medium containing gas/coupling difference improvement sensor installation

E6 jump cycle flow disturbance re coupling sensor

E7 analog fault load exceeds 600 Ω, check circuit impedance

E9 cumulative overflow units/pulses set small to large units/pulses

diagnostic parameters

Signal strength SS up/dn: 50-75 is normal

Signal quality Q up/dn: ≥ 1200 is normal

The amplitude AMP up/dn: 24 ± 5 is normal

Time difference Delta: ≤ 1 μ s is normal

Component replacement

fuse

AC: 0.25A slow melting

DC: 2.0 A slow melting

LCD/keyboard: Power off, remove cover, unplug and plug cables for replacement

Program EPROM (U4): Anti static, diagonally aligned notch press in

Warranty and Service

Warranty period: 1 year for both electronics and sensors

Not covered: fuses, batteries, misuse, non-standard accessories

Repair process: Apply for RA number → Prepay shipping fee → Factory inspection → Free warranty/paid repair

Software support

**PanaView ™**  Support:

Serial port connection and multi instrument management

Read/draw/save sensor signals

Remote programming, cumulative reset, site file management

Real time data display and recording

Key questions and answers

Question 1: What are the requirements for the core straight pipe section of AT868 sensor installation? Why?

Answer: The installation of sensors must meet the requirements of a straight and undisturbed pipe section with an upstream diameter of ≥ 10 times the pipe diameter and a downstream diameter of ≥ 5 times the pipe diameter, and avoid turbulent sources such as valves, elbows, and reducers. This is to ensure a fully developed flow field, ensure the accuracy of ultrasonic flow measurement reaches ± 0.5%~2%, and avoid signal distortion and reading deviation caused by eddies, gas-liquid two-phase, and disturbances.

Question 2: What order should be followed to troubleshoot the E1 low signal error in AT868?

Answer: The order of investigation is:

Check whether the sensor cable is damaged, the shielding grounding is good, and the length difference is compliant

Confirm that the positive and negative terminals (red SIG+, black RTN -) of the sensor wiring are correct

Clamp type inspection of coupling agent and pipeline cleanliness, insertion type inspection for leakage/corrosion

Verify the accuracy of CHx PIPE pipeline parameters (outer diameter, wall thickness, material)

Enter the diagnosis to check the SS signal strength. If it is below 50, replace the sensor

Question 3: What are the standard procedures and accuracy requirements for AT868 analog output calibration?

Answer: Standard process:

Connect the ammeter in series and enter CALIB → SLOT0 → A/C

Calibrate the low point of 4 mA and store it

Calibrate 20 mA high point, store

Perform a 50% range linear test to verify the output of 12.000 mA

Accuracy requirement: Calibration point error ≤ ± 0.005 mA, and full range linearity must meet this requirement before use.