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Categories: Gas Monitors, Process, Specialised Products,

An analytical solution that’s right on time

The HALO 3Q H2O packs a punch in one all-included compact and affordable package. Using Tiger Optics’ renowned time-based technology—Continuous Wave Cavity Ring-Down Spectroscopy—you can verify moisture impurity levels down to 120 ppt in helium, with drift-free stability and virtually instant response. You’ll find our system exceptionally fast to install, easy to use and effortless to maintain, with built-in zero verification. The HALO 3Q H2O specializes in trace-level moisture detection in bulk gases and specialty gases, as well as gas mixtures.

Compact, affordable and powerful, the HALO 3Q H2O brings you:

  • Sub-parts per billion (ppb) moisture detection capability in an array of gases
  • Small footprint (two HALO 3Qs fit in a 19” rack)
  • Absolute measurement (freedom from calibration)
  • Low cost of ownership and great ease of use
  • Wide dynamic range—over four orders of magnitude
  • Clean technology


  • Gas Quality Control
  • Gaseous CRMs & Calibration Gas Mixtures
  • High-Purity Gases & Systems
  • Research & Development


Laboratory & Scientific

Detection Capability

Detection and Matrix Range LDL (3σ) Precision (1σ) @ zero
H2O in N2 0 – 20 ppm 0.6 ppb 0.2 ppb
H2O in He 0 – 4 ppm 0.12 ppb 0.04 ppb
H2O in Ar 0 – 9 ppm 0.3 ppb 0.1 ppb
H2O in H2 0 – 16 ppm 0.4 ppb 0.12 ppb
H2O in O2 0 – 10 ppm 0.3 ppb 0.1 ppb
H2O in Clean Dry Air (CDA) 0 – 18 ppm 0.6 ppb 0.2 ppb
H2O in CO2 0 – 25 ppm 1.6 ppb 0.6 ppb


Operating range See Detection Capability table
Detection limit (LDL, 3σ/24h) See Detection Capability table
Precision (1σ, greater of) ± 0.75% or 1/3 of Sensitivity
Accuracy (greater of) ± 4% or 1/2 of LDL
Speed of response < 3 minutes to 95%
Environmental conditions 10°C to 40°C, 30% to 80% RH (non-condensing)
Storage temperature -10°C to 50°C
Gas Handling System and Conditions
Wetted materials 316L stainless steel (optional corrosion-resistant material), 10 Ra surface finish
Gas connections 1/4” male VCR inlet and outlet
Leak tested to 1 x 10-9 mbar l / sec
Inlet pressure 10 − 125 psig (1.7 − 9.6 bara)
Flow rate Up to 1.8 slpm
Sample gases Most inert, toxic, passive and corrosive matrices
Gas temperature Up to 60°C
Dimensions, H x W x D
Standard sensor 8.73″ x 8.57″ x 23.6″ (222 mm x 218 mm x 599 mm)
Sensor rack (fits up to two sensors) 8.73″ x 19.0″ x 23.6″ (222 mm x 483 mm x 599 mm)
Standard sensor 28 lbs (12.7 kg)
Alarm indicators 2 user programmable, 1 system fault, Form C relays
Power requirements 90 − 240 VAC, 50/60 Hz
Power consumption 40 Watts max.
Signal output Isolated 4−20 mA per sensor
User interfaces 5.7” LCD touchscreen, 10/100 Base-T Ethernet, RS-232
802.11g Wireless (optional), Modbus TCP (optional)
Certification CE Mark
U.S. Patent #7,277,177
Bronwyn Straccione

Bronwyn Straccione

Category Manager - CEMS and Gasmet

Hi there, I'm Bronwyn. I've been with TES for 15 years and I'm the Category Manager for our Gasmet and CEMS equipment sales. My usual work days are Monday - Wednesday. If there's something I can help you with, please give me a call on 0404 161 353 or send me a message and myself or your local sales support will be in touch shortly!

Get in touch for more information...