Products > Yellowbox Portable Oxygen Analyzer

Yellowbox Title

The Ntron Yellow Box is a compact, robust, transportable oxygen analyser providing a versatile solution for high purity oxygen measurement applications. The zirconia sensor offers fast response time and a long service life with virtually no drift. The analyser comprises of up to 3 discreet oxygen sensors for ppm & % oxygen up to 96%.

The Yellow Box is made from light, durable, high impact co-polymer polypropylene which allows for ease of transportation and operation on a daily basis.

  • Long life solid state zirconia sensor
  • Measurement range: 0 to 1000ppm, 0 to 25%, 0 to 96% O2
  • Rechargable battery pack (Optional)
  • Integral flow meter for positive pressure sample flow indication
  • LCD + 4 button HMI
  • Lightweight, rugged and portable
  • 2 and 3 sensor option available
  • Analogue output per sensor

More details


Technical Specifications
Measurement Technology Zirconia (ZR)
Measurement Range 0 to 1,000ppm / 0 to 25% / 0 to 96%
Output resolution ( for %) 0.01%
Output resolution (for ppm) 1ppm
Accuracy +/-2% of reading (or 2ppm O2) @ calibrated temperature and pressure
Response time (T90) <10 seconds @ 20˚C. Warm up time: 15mins from switch on.
LDL (Sensitivity) 0.01% (when measuring %) / 1ppm (when measuring ppm)
Temperature range -20˚C to +50˚C
Pressure range Regulated to 5 psi(G)
Linearity 2% of reading
Life expectation >30,000 hours in 20.9% oxygen (ambient air)
Humidity 0-95% RH non-condensing
Shelf life No shelf life
Electrical Input / Output
Power supply Internal rechargeable battery and charger (Optional) Charge via 3-pin IEC Mains connector @ 85-240 VAC 50-60H
Power consumption Max Load 160mA
Signal output 4-20mA
Digital communications RS232 bi-directional Modbus protocol.
Connection Ports Sample In: 6mm / 1/4” ‘Bulkhead’ tube compression fittings
Sample Exhaust Out: Via Flowmeter port.
Display format % O2 / ppm O2
User Interface LCD wiith 4 button multifunction keypad
Mechanical Specifications
Dimensions See technical drawings
Weight <4.5kg / 4.5kg / 8.5kg
Case materials High impact copolymer polypropylene
Sample gas Standard 0.5 SLPM
Internal regulation Sample pressure & flow set at 5PSIG / 0.3BARG; 0.55SCFH / 250 ml/m
Ingress protection IP67 when case closed for transportation
Sample Connection 6mm / 1/4” compression fitting
Certification Complies with EMC Directive 2004 / 108 / EC. UL/ETL Certification Number: UL-61010-1