Jerome J405

Manufacturer: Arizona Instrument
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The J405 is designed to be easy to operate for quick and accurate analysis of mercury vapor levels.

Key Features

  • Much lower detection levels than the previous Jerome® models
  • 3.5" (9 cm) backlit display, showing everything you need to be confident in the instrument, including 5/8" (1.6 cm) tall character readout, battery charge indicator, and sensor saturation percentage
  • Choice of units for results: micrograms per cubic meter (μg/m3) (default) or milligrams per cubic meter (mg/m3)
  • Easy to understand diagnostic and error detection
  • Auto zero bridge adjustment
  • Updated electronics including 24-bit a/d conversion and on-board storage for 20,000 samples
  • Controlled temperature film heat ensures the sensor removes all mercury and returns to its original state
  • The Jerome® J405 can be operated for 24 hours from the internal 12V battery source or it can be operated using the external AC power supply/charger

Display Range

  • 0.5 μg/m3 to 999 μg/m3
  • 0.001 mg/m3 to 0.999 mg/m3
  • Sample values below 0.5 μg/m3 or 0.001 mg/m3 will be recorded and displayed as 0.00 μg/m3 or 0.000 mg/m3 respectively by the J405. Sample values above 999 μg/m3 (0.999 mg/m3) will be recorded and displayed as “High Concentration.”


  • 0.01 μg/m3 Hg
  • 0.001 mg/m3 Hg

Response Time

  • Sample mode: 17 seconds
  • Survey mode: 2 seconds

Flow Rate

  • 750 ± 50 cc/min (0.75 ± 0.05 liters/min)

Power Requirements

  • 12 VDC for the instrument (provided by the internal battery AC power supply/charger, external battery pack, or car accessory adapter)
  • 100-240VAC, 47-63Hz, 3.2A for the AC power supply/charger


  • Auto-resetting fuse

Internal Battery Pack

  • Rechargeable nickel metal hydride (NiMH)

Operating Environment

  • 0° to 45° C, non-condensing, non-explosive

Case construction

  • Aluminum, powder coated


  • 11" L x 6" W x 6.5" H (28 cm L x 16 cm W x 17 cm H)


  • 5.3 lbs. (2.4 kg)

Digital Meter Display

  • 3.5" (9 cm) liquid crystal display (LCD)

Data Storage Capacity

  • 20,000 samples


  • Digital: USB serial data to PC, printer or USB flash drive
  • Analog: 4-20mA current loop (requires external power source)
  • Accurate to 0.3% of output


  • TUV 61010, CE

Accuracy and Precision

Calibration Point  Accuracy**  Precision (RSD)
1.0 ìg/m3  10% 15%
25 ìg/m3  5% 3%
100+ ìg/m3  5% 3%
**After changing the AG filter, accuracy at 1.0 μg/m3 may change from ±10% to ±20%, and accuracy at 25 μg/m3 and 100μg/m3 may change from ±5% to ±7%. RSD is unchanged.

  • Regulatory detection compliance
  • Regulatory clean up compliance
  • Ambient air analysis
  • Quality control
  • Scrubber efficiency testing
  • Accuracy check for other mercury vapor monitors and control systems
  • Mercury vapor source detection
  • Leak detection
  • Portable mercury vapor detection (the Jerome® J405 is operated from an internal 12V battery source; for charging the batteries, an external AC power supply/charger is included)