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Designed to monitor and alarm for Hydrogen Chloride (HCl) levels in ambient air near industrial sites, manufacturing facilities, combustion processes, etc. The HCl sensor is of the disposable electrochemical type with an expected life of between 3-4 years. The sensor needs no warm up time and is ready to go as soon as the monitor is turned on.

Model 591DR1 has one remote sensor which is electrically connected to the main cabinet.

Unit of Measure


Method of Detection

N/A Disposable electrochemical cell

Ranges Available

N/A 0-20 PPM standard



Accuracy & Repeatability

N/A ±1% of full scale or 1 PPM, whichever is higher


N/A Less than 1% of full scale or 2 PPM per week, whichever is greater

Response Time (T-90)

N/A Less than 15 seconds to 90% step change

Ambient Temperature Range

N/A 32 to 120°F (0 to 40°C), may be operated at lower temperature with auxiliary heater


N/A ±1% of full scale or 1 PPM, which ever is higher

Size & Weight

N/A 14" H x 12" W x 8" D (35.6 x 30.5 x 20.3 cm) @ 18 lbs. (8.2 kg)


N/A 115 VAC, 60 Hz 220 VAC, 50 Hz

Output Options

N/A 0-1 VDC 4-20 mA


N/A Optional - Dual high HCl alarm light and relays (SPDT - 5A@ 230 VAC) Optional: Audible alarm with 'Acknowledge' button


N/A Designed to monitor and alarm for Hydrogen Chloride (HCl)levels in ambient air near industrial sites, manufacturing facilities, combustion processes, etc.



  • Standard electrochemical cell
  • Fast response to the presence of NO2 in the air
  • Instant warm-up, no wait
  • Bright digital readout - no reading interpretation errors
  • Easy use and calibrate
  • Easy to maintain modular layout
  • 4-20mA output signal for recording
  • NEMA 12 fiberglass enclosure is standard



  • 'Fail Safe' alarms available
  • Strobe light
  • NEMA 4 or 4X enclosures
  • Cold weather package for operation to -5°F (-20°C)

Unique Applications


    All Nova analyzers are built using proven technologies and techniques. If this product does not suit your application, please contact Nova. In many cases, we are able to build an analyzer specific to your needs.

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