Field Instruments

General

• The Rosemount 499ATrDO Trace Dissolved Oxygen Sensor is intended for the determination of dissolved oxygen at the ppb (parts per billion) level.The sensor is available with either an integral cable or Variopol (VP6) quick disconnect fitting. Three replacement membrane assemblies, three O-rings, and a 4 oz. (125 mL) bottle of electrolyte solution are provided with each sensor. To reduce initial comedown time, the sensor is shipped with the membrane in contact with a saturated solution of sodium sulfite. The sensor is intended for use with the low flow cell (PN 24091-00).

Features

• Extend sensor life with simple membrane and electrolyte replacement; no special tools needed.
• Automatic temperature correction with integral Pt-100 resistance temperature device (RTD).
• Easy in-air calibration.
• Fast comedown time; an out-of-the-box Rosemount 499ATrDO sensor is accurate at the 1 ppb level within five hours after being placed in service.
• Variopol (VP6) cable connector option eliminates cable twisting and allows for quick sensor replacement.
• Measures dissolved oxygen between 0.1 ppb and 20 ppm.
• Operates in process temperatures up to 122 °F (50 °C).
• High accuracy of ±1.0 ppb when measuring concentrations below 20 ppb.
•  Internal flexible bladder allows automatic pressure equalization for minimal influence from pressure changes on sensor response.

Specifications

• Make: Emerson
• Model: 499ADO-54
• Product type : 499ADO Dissolved Oxygen Sensor
• Transmitter compatibility : 54 = For use with Rosemount 1056, 56, 1066, and 5081 transmitters
• Cable options : - = No selection - standard 25 ft cable
• Sensor Range : 0 to 20 ppm (mg/L) as O2. For measurements at the ppb level, choose 499ATrDO.
• Wetted parts: Noryl1, Viton2, EPDM, Teflon3 (TFE), and silicone
• Cathode: Gold (not normally wetted)
• Accuracy: ±0.2 ppm at 25 °C (77 °F)
• Repeatability: ±0.5% of reading at 25 °C (77 °F))
• Response time: <20 sec to 90% of final reading (0 to 2 ppm) at 25 °C (77 °F)
• Pressure: 0 to 65 psig (101 to 549 kPa abs)
• Temperature: 0 to 50 °C (32 to 122 °F)
• Process connection: 1 in. MNPT
• Electrolyte volume: 25 mL (approx.)
• Electrolyte life: 4 to 6 months (approx.)
• Cable length (standard integral cable): 25 ft (7.6 m)
• Cable length (maximum): 300 ft (91 m)

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