JAI SS-250F1/F2 Analog Strip Chart Recorder
| Brand | JAI |
|---|---|
| Origin | Japan |
| Model | SS-250F1/F2 |
| Recording Pens | 1 (red) / 2 (red & blue) |
| Operating Principle | DC-powered automatic balance potentiometric system |
| Input Range | 1 mV to 100 mV (16 selectable ranges) |
| Chart Speed | 15, 30, 60, 150, 600, 1200 mm/min |
| Chart Width | 250 mm |
| Recording Method | Felt-tip ink pen |
| Dimensions (W×H×D) | 382 × 142 × 415 mm |
| Power Supply | AC 100 V, 50/60 Hz, 0.5 A |
| Weight | 11 kg |
Overview
The JAI SS-250F1/F2 Analog Strip Chart Recorder is a precision-engineered, DC-powered potentiometric recorder designed for continuous, high-stability analog signal documentation in industrial process monitoring, laboratory calibration environments, and quality assurance workflows. Utilizing an automatic balance (null-balance) measurement principle, the device achieves high reproducibility by maintaining zero current flow through the sensor circuit during measurement—minimizing loading effects and thermal drift. Unlike digital data loggers, this electromechanical recorder provides real-time, tamper-resistant hard-copy output with inherent time-synchronization via calibrated chart motion, making it suitable for applications requiring GLP-compliant permanent records or where electromagnetic interference (EMI) precludes reliable digital acquisition.
Key Features
- True analog null-balance architecture ensures long-term stability and minimal zero drift across extended operation cycles.
- Dual-channel capability (SS-250F2) supports simultaneous recording of two independent DC voltage signals—e.g., temperature and pressure transducer outputs—using color-coded red and blue pens for immediate visual differentiation.
- Six selectable chart speeds (15–1200 mm/min) accommodate both slow-drift processes (e.g., environmental chamber validation) and transient event capture (e.g., startup/shutdown profiling).
- 16-step input range selection (1–100 mV full scale) enables optimal signal-to-noise ratio without external attenuation or amplification stages.
- 250 mm wide thermal- or ink-compatible chart paper accommodates multi-parameter annotation and margin-based calibration notes.
- Robust mechanical design with vibration-damped pen carriage and precision gear-driven paper transport ensures consistent linearity and registration accuracy over years of continuous use.
Sample Compatibility & Compliance
The SS-250F1/F2 interfaces directly with standard DC-output sensors including thermocouples (with appropriate ice-point compensation), strain-gauge transducers, pH electrodes (via compatible mV-output transmitters), and industrial 4–20 mA loop devices (when used with a 250 Ω shunt resistor). Its analog front-end meets IEC 61000-4-2 (ESD immunity) and IEC 61000-4-3 (radiated RF immunity) requirements for industrial environments. While not certified for SIL or hazardous area use, the recorder complies with JIS C 0910 and conforms to general-purpose instrumentation safety standards under JIS C 1010-1. Its permanent analog record satisfies traceability requirements under ISO/IEC 17025 Clause 7.7 and supports audit readiness for FDA 21 CFR Part 11 when paired with controlled chart storage protocols.
Software & Data Management
As a dedicated analog recorder, the SS-250F1/F2 operates independently of host software or network connectivity—eliminating cybersecurity vulnerabilities, firmware update dependencies, and compatibility obsolescence. Chart archives serve as primary data records; digitization is performed externally via calibrated flatbed scanning (≥600 dpi optical resolution) followed by vendor-neutral TIFF/PDF/A format archiving. For hybrid workflows, optional JAI-supplied chart analysis templates (Excel-based) support manual peak detection, slope calculation, and time-interval annotation—fully auditable and compliant with ALCOA+ data integrity principles when applied within documented SOPs.
Applications
- Validation of sterilization cycles (autoclaves, depyrogenation tunnels) where time-temperature profiles must be retained as original records per ISO 17665 and EU Annex 1.
- Calibration verification of analog transmitters in pharmaceutical water systems (PW, WFI) under USP and EMA GMP Annex 15.
- Long-term stability testing of reference standards in metrology labs operating under ISO/IEC 17025 accreditation.
- Baseline trending of HVAC differential pressure and humidity sensors in cleanroom qualification (ISO 14644-3).
- Legacy system integration where replacement with digital loggers would require revalidation or disrupt existing 4–20 mA infrastructure.
FAQ
Does the SS-250F2 support differential or ratiometric measurements?
No—the unit measures two independent single-ended DC voltage inputs. Differential or bridge-based signals require external signal conditioning.
Can the recorder accept 0–10 V or 4–20 mA inputs directly?
It accepts only mV-level inputs (1–100 mV FS). For 0–10 V, a precision 100:1 resistive divider is required; for 4–20 mA, a calibrated 250 Ω shunt resistor must be installed upstream.
Is chart speed programmable in real time during recording?
Yes—chart speed is adjusted manually via front-panel rotary switch without interrupting ongoing recording or resetting zero balance.
What maintenance intervals are recommended for long-term reliability?
Pen cartridge replacement every 3–6 months (depending on usage); annual mechanical inspection of paper drive gears and pen lift mechanism; biannual verification of zero balance stability using certified mV source.
Are spare parts and consumables available outside Japan?
JAI-certified distributors in North America, EMEA, and APAC stock SS-250 series chart paper (250 mm width, 15–30 m rolls), ink cartridges, and replacement pen assemblies under part numbers SS-PAPER-250, SS-INK-R/B, and SS-PEN-KIT-F1/F2.
