GUARDIAN PLUS 97335 96.61.29.601.9 EDINBURGH SENSOR 110V

  • Model: Guardian Plus 97335 (Ref: 96.61.29.601.9)

  • Brand: Edinburgh Sensors (Applied Technology)

  • Series: Guardian Plus (Fixed Gas Monitor)

  • Core Function: High-precision infrared gas detection for monitoring concentrations of specific gases (typically or hydrocarbons) in industrial and laboratory environments.

  • Product Type: Fixed Gas Sensor / Transmitter

  • Key Specs: 110 V AC power, infrared (NDIR) technology, high stability, digital/analog output options

  • Supply Status: ✅ Available (Refurbished/Surplus/New)

  • Stock Quantity: < 5 units

  • Warranty: 12 months

  • Ship From: Europe / Global Logistics Hub Condition: Original Factory New / Professional Refurbished

Key Technical Specifications

  • Measurement Principle: Non-Dispersive Infrared (NDIR) – provides high accuracy and long-term stability

  • Power Requirement: 110 V AC (standard industrial power supply)

  • Gas Compatibility: Configured for specific gas detection (e.g., , , or other hydrocarbons)

  • Output Interface: 4–20 mA, RS-232, and relay alarm contacts

  • Calibration: External calibration via integrated ports; high resistance to drift

  • Housing: Robust industrial enclosure, designed for fixed-point installation

  • Environmental: Rated for temperature and humidity stability required in precision sensing

Application Scenarios & Engineering Pain Points

The Guardian Plus series is widely used in high-stakes environments where precision gas measurement is a legal or safety requirement. The primary engineering challenge is “Optical Fouling.” Because these sensors rely on an infrared light path, any dust, moisture, or particulate matter that enters the sensing chamber can cause a “Zero Drift” or “Sensitivity Loss.”

GUARDIAN PLUS 97335 96.61.29.601.9 EDINBURGH SENSOR 110V

Typical Application Scenarios:

  1. Food & Beverage – Modified Atmosphere Packaging (MAP) Monitoring levels in storage or processing areas.

  2. Laboratory & Research – Incubation Maintaining precise gas concentrations for sensitive environmental control.

  3. Industrial Safety – Leak Detection Detecting hydrocarbon leaks in hazardous process areas to trigger automatic ventilation or shutdown.

Case Study: Addressing Nuisance Alarms in Monitoring A research lab reported frequent nuisance alarms from their Guardian Plus 97335. The sensor would periodically spike despite no gas leaks being present. Investigation revealed that the sensor was mounted near an air intake where particulate matter was coating the internal optical mirror. By installing an additional particulate filter on the sample inlet and scheduling a quarterly “Optical Path” clean, the nuisance alarms were eliminated.

Troubleshooting Quick Reference

Don’t assume the electronics have failed if the gas reading is erratic. 90% of issues are sample-side.

Failure Symptom Possible Cause Quick Check Method Recommended Action
“Sensor Fault” Optical path obstruction Inspect internal sensor chamber Clean optics per manual instructions
Drifting Readings Temperature/Pressure instability Check ambient conditions Ensure sensor is in a stable environment
No Power (110 V) Power Supply Fuse Measure AC at terminal block Check external fuse & AC feed
Calibration Error Expired Span Gas Check calibration gas integrity Re-calibrate with fresh certified gas

Engineer’s Note: ❗ Crucial Advice: Always verify the gas type configuration. The 96.61.29.601.9 part number is specific to a factory calibration. If you attempt to use this sensor for a gas other than what it was factory-calibrated for (e.g., using a sensor to measure ), the readings will be completely invalid. Infrared sensors are “gas-specific” due to the narrow-band optical filters used in the detection cell.

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