HERMES™ Personal Mercury Monitor™
The World's Smallest Mercury Monitor

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​2B Tech has taken the next step in miniaturization of UV-based mercury monitors by developing the HERMES Personal Mercury Monitor or "PMM."  The HERMES has dimensions of 4 x 3 x 1.5 inches and weighs only 0.75 lb (340 g).  It has a built in GPS so that mercury measurements may be logged continuously along with geographic location. By folding the optical path in the shape of a "U," it was possible to achieve a 15-centimeter path length, enabling extremely sensitive measurements of mercury in ambient air.


Applications

  • Monitoring of exposure to individuals in the workplace
  • Monitoring and control of mercury in industrial settings
  • Personal exposure monitoring for studies of health effects of air pollutants
  • Long-term monitoring at remote locations where power is highly limited 
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Specifications

Measurement Principle UV Absorption at 254 nm
Linear Dynamic Range 0 to 2,000 μg/m3
Resolution 0.1 μg/m3
Precision (1σ rms noise) Greater of 0.1 μg/m3 or 2% of reading (in 10-s measurement mode)
Limit of Detection (2σ) 0.2 μg/m3 (in 10-s measurement mode)
Accuracy Greater of 0.5 μg/m3 or 5% of reading
NIST-Traceable Calibration Yes
Measurement Interval Fast mode: 2 s
Measurement mode: 10 s
Data averaging options: 1 min, 5 min, 1 hr
Flow Rate (nominal) ~0.8 Liter/min
Flow Rate Requirement >0.5 Liter/min
Baseline Drift < 0.1 μg/m3/day
< 5 μg/m3/year
Sensitivity Drift < 1%/day
< 3%/year
Measurement Time, Frequency Fast mode: 2 s, 0.5 Hz
Measurement mode: 10 s, 0.1 Hz
Response Time, 100% of Step Change For 2-s output: 4 s, 2 points
For 10-s output: 20 s, 2 points
Averaging Times 1 min, 5 min, 1 hr
Data Storage 8,192 lines
(2-s fast mode ~4.6 hr; 10-s meas. mode ~1 day; 1-min avg ~6 days; 5-min avg ~1 mo; 1-hr avg ~1 yr)
Mercury Units ppb, µg m-3
Pressure Units torr
Temperature Units K
T and P Corrected Yes
Operating Temperature Range 0 to 50 °C
Operating Altitude Range ~0-13.5 km (150-1,013 mbar)
[modifications for higher altitudes available as an option]
Power Requirement;
Supplied by battery or 110/220 VAC Power Pack		 7-24 V dc, nominally 250 mA at 12 V, 3.0 watt
External Battery 7.4 Volt, 1.6 amp hour, Lithium Ion Battery, 5-8 hr
Size 4.0 x 3.0 x 1.5 inches (10.2 x 7.6 x 3.8 cm)
Weight 0.75 lb. (0.34 kg)
Data Transfer Baud Rate 19200
DewLine™ Yes
GPS Yes
Options Sampling probe, modifications for higher altitude, wall-mount bracket


System Includes


  • HERMES™ Personal Mercury Monitor™
  • AC Power Adapter (100-240 VAC to 12 VDC) with Country-Specific Plug
  • 7.4 V Lithium Ion Battery
  • Battery Charger
  • Serial Port Cable
  • USB Cable
  • Zeroing Cartridge
  • USB stick with Operation Manual, 2B Display Software, and USB Driver
  • Instrument Birth Certificate
  • Calibration Data and NIST-Traceable Calibration Certificate
  • One Year Warranty