How to install and wire the Yokogawa FLXA402T turbidity and chlorine liquid analyzer?

(3) Pipeline installation (required/U option)

Fix the pipeline bracket (including U-bolts) onto the nominal 50A pipeline, ensuring that the bracket is horizontal/vertical;

Fix the analyzer on the bracket with 4 screws, with a torque of 2N · m. If equipped with a sunshade, use the 2 screws above the bracket to fix the sunshade.

3. Disassembly of shielding cover (before wiring)

The high-voltage power terminal and relay module of the analyzer are covered by a shielding cover. Before wiring, the power must be cut off. Loosen the two screws on the shielding cover (marked with a triangle), pinch the circular mark, and pull out the shielding cover (be careful to save the screws to avoid loss); After wiring is completed, the shielding cover needs to be reinstalled to ensure safety and anti-interference.

Wiring operation specifications

1. Installation of cable sealing sleeve

All cable entrances need to be equipped with sealing sleeves (standard M20 × 1.5, compatible with cable outer diameters of 6-12mm), and unused entrances need to be sealed with rubber plugs:

Ordinary cable: Assemble in the order of "sealing sleeve body → sealing ring → nut", torque 2N · m;

Ethernet cable: Use a black dedicated sealing sleeve (suffix - standard for E models);

Catheter protection: When selecting a catheter adapter (/CB □//CD □//CF □), replace the standard sealing sleeve with a dedicated adapter sealing sleeve (white). The adapter needs to be connected to a flexible catheter to avoid stress damage to the housing.

2. Key wiring process

(1) Power wiring

Confirm power outage, strip off the insulation layer of the power cable (cross-sectional area ≤ 2.5mm ², AWG14), and crimp the solderless terminal;

Connect the AC power supply to terminals "L" (live wire) and "N" (neutral wire), and connect the protective grounding wire to the internal grounding terminal (M4 screw);

After checking the wiring is correct, reinstall the shielding cover. The external power switch/circuit breaker should be labeled as a "power-off device" and installed in an easy to operate position.

(2) Relay output wiring (suffix WR)

The four sets of SPDT contact terminals are defined as follows, connected to the controller/PLC using multi-core cables, with terminal screws of M3 (torque 0.6N · m):

|Terminal number | Contact type | Function|

|31/32/33 | S1 (C/NC/NO) | Universal Contact 1 (normally closed/common/normally open)|

|41/42/43 | S2 (C/NC/NO) | Universal Contact 2|

|51/52/53 | S3 (C/NC/NO) | Universal Contact 3|

|71/72/73 | S4 (C/NO/NC) | Fault safety contact (NO → NC when power is off)|

(3) Digital communication cabling

Modbus RTU (RS-485, suffix - R):

Use shielded twisted pair cables (multi-core) to connect terminals 91 (A+, data positive), 92 (B -, data negative), 93 (GND, signal ground), and 94 (SHIELD, shielding layer);

When terminal matching is required at both ends of the bus, use the standard jumper to connect terminals 91 and 95 (with a built-in 110 Ω resistor). Unused jumpers need to be stored in the jumper bracket on the inside of the panel.

Modbus TCP/IP (Ethernet, suffix - E):

Use CAT5 and above shielded twisted pair (STP) cables to make RJ45 connectors (supporting direct/cross connections);

Insert the network cable into the Ethernet interface of the analyzer, fix the cable with a black dedicated sealing sleeve, and ground the shielding layer.

(4) Simulate IO wiring

4-20mA output: Use shielded cables, connect terminals 61 (mA1+)/62 (mA1-), 65 (mA2+)/66 (mA2-), etc., and connect the shielding layer to terminal 63 (or 89, - N4 model);

4-20mA input (- N4 model): Connect terminals 87 (AI+) and 88 (AI -), and connect the shielding layer to terminal 89;

Contact input: Connect terminals 21 (DI1)/24 (DI2, - N4 model) and 22 (COM), used to initiate cleaning cycles or switch ranges, with shielding layer connected to terminal 63.

3. Sensor wiring

(1) SENCOM sensor (- CL/- TB)

Use sensor specific cables, remove the cable sealing sleeve and standard sealing ring, and replace with standard grommet (suitable for thin cables);

Connect according to the terminal markings "SHLD (shielding), GND (signal ground), B - (data negative), A+(data positive), V5 (power supply)", with terminal screw M3 (torque 0.6N · m);

The sensor adopts single ended grounding to avoid interference caused by grounding at both ends.

(2) PH sensor (- P1)

Conventional pH sensor connection terminals 13 (REF, reference electrode), 15 (Glass, measuring electrode), 11/12 (Temp, temperature compensation), 14 (Solution ground), shielding layer connected to 16/17;

Low impedance reference electrodes require the installation of jumpers (2 standard), and unused jumpers should be stored in the jumper bracket; Special double glass electrodes do not require jumper wires.

(3) Conductivity (SC) sensor (- C1)

The 4-electrode sensor is directly connected to terminals 11 (Temp+), 12 (V -), 13 (I -), 15 (V+), and 16 (I+);

Two electrode sensors require one jumper wire (standard) to be connected between terminals 13-14 and 15-16 to ensure normal signal transmission.

Inspection and maintenance

1. Check after wiring

Before powering on: Confirm that all wiring is correct, the shielding cover has been reinstalled, and the panel screws are evenly tightened (torque 1.5~1.6N · m, electric screwdriver speed ≤ 400rpm);