VOC Sensor Class 1 Div 1

VOC sensor

Key Features

  • Class I, Division 1 (Zone 1) continuous
    VOC monitoring solution for hazardous
  • Three wire 4-20mA analogue output and
    RS-485 digital communication in
    Modbus protocol
  • Three dry contact relays (<30V, 2A)
    normally open (or normally closed), one for
    high and low alarm, another for fault alarm
  • Explosion-proof stainless-steel enclosure
    suitable for outdoor hazardous
    environment applications
  • Magnetic-key interface eliminates the
    need to open the explosion-proof housing
    when adjusting parameters
  • Continuous VOC monitoring in hazardous
    and non-hazardous area locations
  • Reduced maintenance costs due
    to easily removable sensor module.
    Sensor and lamp can be removed
    without tools and serviced in
    hazardous location
  • Faster response time with sample
    flow-through design powered by
    internal diaphragm pump
  • Humidity compensation ensures
    accurate reading even in humid environments

The RAEGuard 2 PID is a fixed photoionization detector (PID) that measures a broad range of volatile organic compounds (VOCs)
The RAEGuard 2 PID has a graphic display and LED light status indicator for fault and alarm conditions. In addition, Low, High, and Fault relays1 can be configured to trigger external alarms or process controls. Over 200 correction factors1 are pre-programmed and allow users to display readings of a specific target gas. A magnetic key interface enables the detector to be calibrated and operational parameters adjusted with the explosion-proof enclosure in place.

RAEGuard 2 Fixed Sensor Head Specifications

Basic parameters  
Working current DC 10 to 28V, 210mA at 24V
Power <5W
Output • 4-20mA
• Three-level programmable alarm relays (30 VDC, 2A)
• RS-485 (Supports Modbus)
Sampling Internal diaphragm pump, up to 500cc/min
IP rating IP-65
Mechanical interface 3/4” NPT Male
Installation 50.8 mm (2”) pipe-holding or wall mounting
User interface Three-key magnetic bar adjustment
Calibration Two points
Warranty 1 year for the pump, 2 years for the housing and electronics
Environmental parameters  
Temperature -20°C to +55°C (-4°F to 131°F )
Humidity 0 to 95% relative humidity, non-condensing
Pressure 90 to 110kPa
Display 128 x 64 matrix backlit LCD, supports graphic display
Physical parameters  
Size 10.1” L x 7.9” W x 4.2”H (257 x 201 x 107 mm)
Weight 3.5 kg (7.7 lbs)
Material 316 stainless steel
ATEX Ex II 2(1)G, Ex d [ia Ga] IIC T4 Gb
UL/CSA Class 1, Div. 1, Groups ABCD T4
IECEx Ex d [ia Ga] IIC T4, Gb

DigiPID Sensor Module Specifications

Power supply 5V ±0.25V DC
Current 110mA max
Power consumption < 0.6W
Measuring range 0.01 to 100 ppm
0.1 to 1000 ppm
1 to 1000 ppm (No relays or correction factors)
Resolution 10 ppb, 1 ppm (depends on model)
Response time Pumped (T90): <30 s
Calibration Two-point off-line and field calibration
Optional three-point calibration
Accuracy ±2% for calibration point
Analogue output 0.5 - 2.5V (ro=1.0k)
Digital interface Serial Interface (UART)
Transmit (Tx): 3.3V TTL
Receive (Rx): 3.3V TTL
Warranty 2 years for the lamp, 1 year for the sensor, pump,
electronics, and housing
Operating temperature -20ºC to +55ºC (-4ºF to +131ºF)
Humidity 0 to 95% RH non-condensing
EMI/RFI Highly resistant to EMI/RFI Compliant with
EMC Directive 2004/108/EC
Package 316 stainless steel
Spray watertight for IP-65 rating
Dust membrane for sensor front protection
Size 49mm x 150.8mm (1.92” D x 5.94” L)
Weight < 550g (19.4 oz)
ATEX II 1 G EX ia IIC T4 and 1M1 Ex ia I
UL/CSA Class I, Div. 1, Groups A B C D T4
IECEx Ex ia IIC T4 Ga and Ex ia I



  • The RAEGuard 2 PID is a fixed
    photoionization detector (PID)
    that measures a broad range of
    volatile organic compounds (VOCs)

  • Environmental Protection

  • Indoor Air Quality

  • Education / Medical Laboratory Monitoring

  • Chemical Storage

  • Solvent monitoring in Pharmaceutical Manufacturing

  • Ammonia in refrigeration and chemical applications

  • Alcohols, Ethylene Oxide in Healthcare facilities

  • Chlorinated Hydrocarbons in dry-cleaning – Trichloroethylene, Perchloroethylene

  • Fence line monitoring VOC’s around chemical storage and manufacturing facilities


RAEGuard Ordering Options

RAEGuard 2 Fixed Sensor Head Includes: • Explosion-proof stainless steel enclosure with LCD display, integrated sampling pump and relays, digital connector for external sensors
• Magnetic key
DigiPID Sensor Module Includes: • Complete stainless steel PID sensor module with UV lamp and digital connector output for use with RAEGuard 2
• Choice of detection range 0.01 to 100 ppm, 0.1 to 1000 ppm, or 1 to 1000 ppm
• DigiPID maintenance kit
RAEGuard 2 PID Kits Includes: • All RAEGuard 2 Fixed Sensor Head contents and all DigiPID contents as stated above