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A Note from the CEO

Biodirect was founded to help purchasing agents and research laboratories to aquire pre-owned laboratory equipment and services…

on 100% Certified,
Pre-Owned Lab Equipment

ID	Product	Manufacturer	Model #	Model 2	Status

3721	Monitor O2	Advanced Instruments	GPR-20		Available
Description/Details: GPR-20 series % O2 analyzer. Technical Specifications Ranges: 0-1%, 0-10%, 0-100% Accuracy (the greater of): At constant temperature: ±2% of reading or ±0.5% FS Over operating range: ±5% of reading or ±1.25% FS Sensitivity: 500 ppm (0.05% oxygen) Resolution of display: 0.001% on 0-1% range Operating range: -10°C to +50°C Response time 90% of full scale: 9 seconds Drift: Less than 0.11% of reading per °C Pressure: Flowing stream inlet 5-30 psig with flow control of 1-5 SCFH; vent to atmosphere Flow sensitivity: Insensitive between 1 to 5 SCFH Calibration: 3-4 months using ambient air or certified gas approximating 80% of range or next higher Application: Suitable for continuous use in industrial gases and intermittent use in acid gases....

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