I. Applicable Scenarios and Core Requirements
The E+H pH/ORP measurement system is suitable for high-impedance electrode scenarios, with electrode impedance typically 100MΩ-800MΩ. Therefore, dedicated measurement cables, connectors, and junction boxes must be used to ensure the entire measurement system adapts to this impedance range. Ordinary cables cannot meet the requirements, leading to signal attenuation or measurement errors.
II. Core Products and Compatibility
(1) Measurement Cables (CPK Series)
The CPK series measurement cables are the core accessories for E+H pH/ORP measurement. Different models are compatible with different electrode plug types and application scenarios. Below are the compatible instruments and key features of each model:
1. Models, Compatible Instruments, and Key Features
| Model | Compatible Electrode Plug | Key Features | Temperature Resistance |
|---|---|---|---|
| CPK 1 | GSA/SSA | Standard model, supports basic measurement | -25~+80℃ (PVC jacket) |
| CPK 2 | GSA | Focuses on industrial scenarios | -25~+80℃ (PVC jacket) |
| CPK 3 | GSA | For laboratory use, mainly short length specifications | -25~+80℃ (PVC jacket) |
| CPK 6 | GSA/SSA | Compatible with Sensopac CPA 320, supports dual reference electrodes, multi-electrode configuration (S/D/A type) | -25~+80℃ (PVC jacket) |
| CPK 7 | TSA/TSS | Integrated temperature compensation function (Pt 100), compatible with pH electrodes with built-in temperature sensors | -25~+80℃ (PVC jacket) |
| CPK 9 | ESA/ESS | High-temperature compatibility, IP68/NEMA 6X waterproof, supports Ex applications, with or without built-in temperature sensor | Standard: -25~+80℃ (PVC jacket) High-temp: 0~130℃ (TPE jacket) |
| CPK 12 | ESA/ESB | Compatible with glass/IsFET pH electrodes (with built-in temperature sensor), can adapt to IsFET sensors such as TopHit CPS 401, waterproof and explosion-proof | 0~130℃ (TPE jacket) |
2. Common Advantages
- Insulation resistance: All CPK series measurement cables have insulation resistance >10¹⁴Ω/m
- Coaxial capacitance: <100pF/m
- Anti-interference: Fully shielded design resists EMC interference
- Mechanical stability: Strong
- Color identification: Non-explosion-proof models are black/gray, explosion-proof models (Z version) are blue
(2) Extension Cables (Compatible with Corresponding Measurement Cables)
Extension cables are used to extend the length of measurement cables and must correspond to the measurement cable model. Below are descriptions of each model:
- PMK: Extension cable with dedicated coaxial line, gray jacket, no specific compatible measurement cable indicated.
- DMK: Consists of coaxial lines, used for connection extension, no specific compatible measurement cable indicated.
- CYK 71: Contains coaxial line + 4 auxiliary cores, black version compatible with CPK 1, CPK 7, CPK 9, explosion-proof version is CYK-Ex 71 (blue).
- MK: 2-core signal line + shielding layer, compatible with 4-20mA signal, no specific compatible measurement cable indicated.
- CYK 12: Contains coaxial line + 5 control cores, black version compatible with CPK 12 (compatible with IsFET sensors), explosion-proof version is CYK 12-Ex (blue).
(3) Connectors and Junction Boxes
Connectors and junction boxes are key accessories to ensure the integrity of the measurement system and must be selected according to cable type and application scenario.
- Connectors:
- KS 3/5: Compatible with 3/5mm coaxial cables (e.g., PMK, DMK)
- KS 0.75: Compatible with 2/3 auxiliary cores
- TOP 68: Compatible with electrodes with ESA/ESS/ESB plugs
- BNC angled plug
- Junction Boxes:
- VBA: Protection class IP65, equipped with 10 high-impedance terminals, suitable for general scenarios
- VBE: Compatible with the connection of Ex zone 0 electrodes to DMK/PMK, suitable for explosion-proof scenarios
III. Technical Parameters
| Parameter | Specification |
|---|---|
| Conductor material | Tinned copper |
| Insulation material | PE/PVC |
| Protection class | Up to IP68/NEMA 6X |
| Explosion-proof certification | Ex application models require blue cables and dedicated accessories |
IV. Ordering Notes
When selecting models, comprehensive consideration must be given to electrode plug type, temperature sensor configuration, temperature requirements, and explosion-proof requirements. Below are key ordering points:
- Select the appropriate measurement cable model according to electrode plug type, whether a temperature sensor is included, and temperature requirements.
- Extension cables must correspond to the measurement cable model; for explosion-proof scenarios, prioritize blue Ex versions.
- Cable lengths are available in standard specifications such as 5/10/15/20m, and can also be customized.
- For high-temperature scenarios, choose TPE jacket models.
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