How to install and wire Yokogawa PH4/OR4 series pH and ORP sensor (IM12B10B00-01EN)?

Choose PH4 series for pH measurement parameters and OR4 series for ORP measurement parameters; PH measurement with HF → PH4F;

If the temperature compensation fluctuates greatly (>5 ℃), choose the RTD model (such as PH4FT), otherwise choose the basic model (such as PH4F); Process temperature fluctuates between 20~80 ℃ → PH4FT;

For the installation bracket, choose PH8HS for immersion type and PH8HF for flow type, which require corresponding adapters (such as S3 stainless steel adapter); Pipeline installation → PH8HF bracket+PH4F+/S3 (stainless steel adapter, acid resistant);

Cable and terminal cable length (03=3m, 05=5m, etc.), terminal type matching transmitter (such as E-pin terminal compatible with FLXA202); Transmitter distance sensor 5m → PH4FT-05-E;

Choose FFKM (/PF) as the sealing material for organic solvents/high-temperature alkali, and fluororubber (default) for ordinary scenarios; Scenario containing ethanol → PH4F+/PF;

2. Meaning of suffix codes

The suffix code is used to determine the adapter material, cable length, terminal type, seal and other details of the sensor. The core code meaning is as follows:

Core options for suffix code classification

/S3//PP/PV adapter material/S3 (SUS316 stainless steel, acid resistant),/PP (polypropylene, neutral scenario),/PV (rigid polyvinyl chloride, low-cost);

/HPV//TN special adapter/HPV (heat-resistant polyvinyl chloride, upper limit of 80 ℃),/TN (titanium material, strong corrosion scenario);

/PF sealing material is perfluoroelastomer (FFKM), suitable for organic solvents and high-temperature alkalis (such as NaOH solution above 80 ℃);

-The cable length numbers such as 03/-05/-10 represent the length (unit: m), such as -03=3m, with a maximum length of 20m; -00 indicates no cable (terminal box required);

D/E/F/G terminal types D (fork shaped terminal, compatible with PH400G), E (pin terminal, compatible with FLXA202), F/G (ring terminal, compatible with FLXA21);

Installation and wiring process

1. Preparation before installation

(1) Unpacking and Inspection

Confirm that the appearance of the sensor is undamaged (glass body, cable without cracks), and the model and suffix code (such as PH4F-05-E/S3) are consistent with the order;

Check the integrity of attachments: storage cap (including protective liquid), O-ring (default fluororubber, optional/PF), adapter (such as/S3);

When removing the storage cap, use a screwdriver to unscrew the screw at the blue gasket to avoid damaging the glass electrode; Check the "gas layer length" of PH4C/OR4C (confirm that the internal pressure is normal).

(2) Installation site selection requirements

Avoid areas where bubbles gather (such as at the top of pipelines), dead zones, or locations with high flow rates (>2 m/s) to prevent response delays or electrode wear;

Anti HF models (PH4F/PH4FT) should be kept away from strong oxidizing media (such as concentrated nitric acid) to avoid accelerated glass corrosion;

The installation in hazardous areas must comply with the IEC 60079-14 standard, and as a "simple device", it should be matched with an isolated transmitter (such as FLXA202) with a grounding resistance of ≤ 1 Ω.

2. Core installation steps (taking the flow bracket PH8HF as an example)

(1) Adapter and O-ring assembly

Select adapter: Choose the material based on the corrosiveness of the medium (such as S3 stainless steel adapter for acidic medium), and insert the O-ring (default FPM or optional/PF) into the adapter groove;

Pre installed sensor: Thread the sensor through the bracket fixing nut, insert the adapter, and ensure that the glass electrode is completely in contact with the medium channel (without air residue);

Tighten and fix: Tighten the nut clockwise to the O-ring compression seal (to avoid damaging the glass due to over tightening). For medium pressure models (PH4C/OR4C), it is necessary to confirm that the process pressure is ≤ the internal pressure of the sensor.

(2) Cable and terminal connection

The sensor cable contains 4-5 core wires (with an additional 1 core for RTD models), which need to be connected to the transmitter (such as FLXA202) according to the terminal definition. The wiring method is consistent for different terminal types:

Cable core function corresponding terminal (FLXA202 as an example) Remarks

The pH/ORP indicator electrode (GE) transmits measurement signals to terminal 15, ensuring that the wiring is secure and avoiding interference;

The reference electrode (RE) terminal 13 forms a circuit with the indicator electrode and needs to be grounded separately;

The grounding electrode (SE) terminal 14 must eliminate the grounding potential difference and be reliably grounded (grounding resistance ≤ 1 Ω);

RTD (T1/T2, with RTD model) terminals 11/12 are only available for PH4PT/PH4FT/PH4CT and are used for temperature compensation;

VP connector operation: Rotate the sensor connector to align the groove with the cable connector protrusion, gently insert and tighten the nut (only tighten the plastic part to avoid glass damage);

Terminal box usage: WTB10 terminal box is required for long-distance installation (>10m), with a total cable length of ≤ 20m to avoid signal attenuation.