Yokogawa PH4F-120-10E-N HF-Resistant pH Sensor
A 120 mm HF-resistant glass pH sensor with a 10 m pin-terminal cable for Yokogawa liquid-analysis transmitters.
Product Identification
PH4F-120-10E-N is a Yokogawa HF-resistant pH sensor for pH 2 to 11 service. The suffix identifies a 120 mm insertion length, 10 m cable, E pin-terminal termination and the standard -N code.
The sensor uses an S8 head and does not contain an RTD. Where process temperature varies, Yokogawa specifies manual temperature compensation or the SA405 adapter with Pt1000 temperature element.
Engineering Data
| Manufacturer | Yokogawa |
|---|---|
| Model | PH4F-120-10E-N |
| Sensor Type | HF-resistant pH sensor |
| Measuring Range | pH 2 to 11 |
| Measuring Temperature | 0 to 80°C |
| Insertion Length | 120 mm |
| Glass Tube Diameter | 12 mm |
| Body / Wetted Material | Glass |
| Head Form | S8 |
| Temperature Element | None |
| Cable Length | 10 m |
| Terminal Type | E pin terminal |
| Transmitter Compatibility | FLXA402, FLXA202 and FLXA21; legacy PH202 references apply to E termination |
| Applicable Holders | PH8HF flow-through or PH8HS submersion holder with the required adapter |
| HF Concentration Guidance | At pH 2: 500 ppm max; pH 3: 1000 ppm max; pH 4: 10000 ppm max; above pH 5: no stated upper limit |
| Installation Limits | Not for outdoor or guide-pipe-holder use; install more than 15° above horizontal |
Functions
- Uses HF-resistant glass for processes where standard pH glass may be unsuitable.
- Provides a fixed 120 mm insertion geometry and ten-meter transmitter cable.
- Uses pin-terminal termination for the documented Yokogawa analyzer families.
- Supports holder installation with the correct material adapter and optional temperature adapter.
Applications
- Configuration-controlled industrial maintenance and shutdown planning
- Exact-suffix spare identification for installed automation assets
- Reliability support where labels, revisions and interfaces must remain traceable
Lifecycle
- Record the complete model, host equipment, hardware revision and removal photographs in the asset history.
- Store the spare in clean, dry, ESD-safe packaging with connectors and mechanical interfaces protected.
- Confirm current manufacturer lifecycle status and an approved migration path before a critical outage.
FAQ
PH4F-120-10E-N: How should suitability for an HF process be confirmed?
Provide pH, HF concentration, temperature, pressure, contaminants and cleaning chemistry; compare all conditions with Yokogawa limits.
PH4F-120-10E-N: What is needed when process temperature changes significantly?
Use manual compensation with a reliable temperature value or review the SA405 Pt1000 adapter and transmitter configuration.
PH4F-120-10E-N: Can the ten-meter cable be shortened or extended freely?
Treat the supplied cable and E termination as part of the sensor configuration; any change should follow Yokogawa wiring and analyzer guidance.
PH4F-120-10E-N: Which holder details should appear on the order?
State PH8HF or PH8HS, holder material, process temperature and pressure, adapter material, seals and cleaning arrangement.
PH4F-120-10E-N: What acceptance checks are useful before installation?
Inspect the glass and cable, confirm the exact suffix, perform buffer calibration, record slope and zero, and verify stable transmitter response.
PH4F-120-10E-N: When is jet cleaning preferable?
Use the compatible holder jet-cleaning arrangement when automatic cleaning is required; Yokogawa does not specify ultrasonic cleaning for this sensor family.
