YOKOGAWA SC210G Conductivity Detector

YOKOGAWA SC210G Conductivity Detector

Equipment foundation and system composition

1. Core positioning and adaptation system

SC210G is a conductivity detection unit that needs to be used in conjunction with a specific analyzer/converter to form a complete detection system. The compatible equipment and corresponding manual information are as follows:

Corresponding manual number for supporting equipment type

FLXA202, FLXA21 2-wire liquid analyzer IM 12A01A02-01E

FLXA402 4-wire converter IM 12A01F01-02EN, IM 12A01F03-01EN, etc

FLXA402T turbidity and chlorine liquid analyzer IM 12A01G01-02EN, IM 12A01G03-01EN, etc

SC450G 4-wire conductivity converter IM 12D08N05-01E

2. Equipment core classification and parameters

SC210G can be divided into two categories based on measurement range, with the core difference in electrode structure and conductivity range, suitable for different solution detection scenarios:

Model Measurement Type Electrode Structure Battery Constant Measurement Range Applicable Scenarios

SC210G-C low range 316 stainless steel 2-electrode coaxial type 0.05 cm ⁻¹ 0-200 µ S/cm low conductivity solution (such as ultrapure water)

SC210G-D medium range glass tube with equidistant 3-ring platinum electrodes (short circuited on both sides and forming a counter electrode in the middle) 5 cm ⁻¹ 200 µ S/cm-20 mS/cm medium high conductivity solution

3. General technical specifications

Temperature and pressure: Normal temperature 0-105 ℃ (polypropylene material bracket is limited to 0-100 ℃); Conventional pressure 0-1 MPa (polypropylene material support limit 0-500 kPa)

Contact fluid material: SC210G-C (sensor: 316 stainless steel, fluororubber O-ring, polytetrafluoroethylene; Main body: 316 stainless steel, polypropylene); SC210G-D (sensor: platinum, glass, fluororubber O-ring; Subject is the same as Type C)

Temperature compensation: Built in Pt1000 temperature sensor, used to calibrate the effect of temperature on conductivity

Protection level: JIS C0920 waterproof (equivalent to NEMA 4), suitable for humid environments in industrial sites

Safety regulations and usage restrictions

1. Core security principles

Prohibited unauthorized operation: Only use according to the instructions in the manual, unauthorized modification of the device will result in loss of protective function; Repairs require Yokogawa certified spare parts, unauthorized modifications are prohibited

Static electricity and explosion prevention: Non metallic components may carry static electricity, and it is necessary to avoid static electricity generation operations such as wiping with dry cloth; The junction box shell is made of aluminum, which can avoid impact, friction, and sparks; Must comply with explosion-proof standards such as IEC 60079-11 (TIIS certified models cannot be connected)

Temperature limit: The maximum process temperature needs to be determined based on the supporting analyzer (FLXA202/FLXA21/SC202S) and temperature level (T1-T6). For example, under T5 level, FLXA202/FLXA21 with SC210G-C has a maximum process temperature of 54 ℃ at an ambient temperature of 40 ℃, and with SC210G-D it is 95 ℃ (note that the upper limit of T5 level is 100 ℃)

2. Manual usage guidelines

It needs to be handed over to the end user and properly stored, and unauthorized copying/dissemination is prohibited; Yokogawa reserves the right to improve manuals and equipment without prior notice

The manual only describes the device functions and does not guarantee adaptation to specific user scenarios; The equipment is provided as is, and Yokogawa is not responsible for unforeseeable direct/indirect losses

Installation and Wiring Guide

1. Installation type and preparation

SC210G is divided into direct insertion type (installed in process pipelines) and flow type (sample introduced through sampling tubes). Before installation, it is necessary to:

Site selection requirements: easy maintenance, no bubbles in the solution (to avoid measurement deviation), stable liquid level, and away from high temperature (>50 ℃) pipelines

Preprocessing: For direct insertion type, corresponding thread holes (such as R1-1/2, 1-1/2 NPT) or flange holes (JIS 10K 50 RF, etc.) need to be reserved; The circulating polypropylene bracket needs to be equipped with a 50A pipe (outer diameter 60.5mm) and fixed with a bracket to prevent rupture

2. Installation steps

Direct insertion type: Threaded type requires sealing tape to be wrapped around the thread and screwed in; The flange type requires adding gaskets between the flange faces and evenly tightening 4 bolts

Flow type: fixed to the designated installation pipeline, adjustable solution inlet and outlet direction (stainless steel bracket can be adjusted horizontally, polypropylene bracket can be adjusted through the bracket direction)

Direction adjustment: Loosen the union nut of the junction box to rotate it for easy wiring (rotating without loosening the nut will damage the internal wiring)

3. Requirements for piping and wiring

Piping: Hard PVC pipes (JIS K9741, A16) for polypropylene supports, etc; 304/316 stainless steel pipes (JIS G3459, A15) are used for stainless steel brackets; Suggested flow rate<20 L/min (to prevent electrode wear caused by slurry solution), an overflow tank should be installed to remove bubbles, and a shut-off valve should be installed at the maintenance site to prevent leakage

Wiring: The cable length is provided according to the order (3/5/10/15/20m), and the terminals are divided into M4 ring type (compatible with FLXA202/FLXA21), M3 ring type (compatible with FLXA402/FLXA402T/SC450G), and pin type (compatible with multiple devices); The cable should avoid contact with high-temperature components, and the joint locking nut should be tightened for waterproofing after connection. The insulation resistance between the core wires should be ≥ 2 M Ω

Operation and maintenance process

1. Preparation before operation and steady-state operation

Inspection items: correctness of wiring, compatibility of piping materials, solution level (flow type needs to go to the outlet), no leakage; After startup, it is necessary to confirm that there is no bubble interference and no sudden temperature changes (to avoid affecting measurement accuracy)

Steady state maintenance: Conventional solutions (free of pollutants) can be maintained for 1 year without maintenance; Regular calibration with standard solution is required to ensure accuracy; If the analyzer outputs a FAIL signal, refer to the analyzer manual for troubleshooting

2. Core maintenance operations

(1) Electrode cleaning

Cleaning cycle: Low range (0.05 cm ⁻¹) electrodes require almost no cleaning due to minimal impurities in the solution; Medium range (5 cm ⁻¹) electrodes should be cleaned as needed (if the analyzer indicates abnormal electrode polarization)

Cleaning method: Type C (clean the inner and outer electrodes, only the inside of the hole needs to be cleaned externally); D-type (glass material requires a protective tube, gently wipe the platinum electrode on the inner wall of the glass tube with a thin rod wrapped in degreasing cotton)

(2) O-ring replacement

Replacement timing: O-ring damage can cause leakage, and regular inspections are required in high-temperature solution scenarios; Conventional O-ring (fluororubber, model K9050AT/K9050MR), with gate valve model requiring replacement with dedicated O-ring (K9050MS)

Replacement steps: For non gate valve types, simply loosen the union nut and remove the electrode to replace it; The gate valve type needs to first remove the external electrode and locking nut, remove the stop screw and replace the O-ring (recommended to replace in pairs), and calibrate the battery constant after reinstallation

(3) Electrode component replacement

Replacement condition: When the electrode is judged to be faulty (if there is still a large deviation after calibration)

Step: Power off → Remove the connection between the junction box and the electrode (use an Allen wrench to unscrew the electrode assembly) → Install a new component and wire it according to the color (green → C1, yellow → C2, red/black → T1/T2) → Update the battery constant label in the junction box → Enter the new battery constant in the analyzer