10 ppb H2O detection in ultra-pure ammonia


  • High-Brightness LEDs
Detection and Matrix Range LDL Sensitivity
H2O in NH30 – 20 ppm10 ppb8 ppb
H2O in N20 – 6 ppm1.4 ppb1.0 ppb
Operating range See Detection Capability table
Detection limit (LDL, 24 h peak-to-peak variation) See Detection Capability table
Sensitivity (3σ) See Detection Capability table
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, 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 bar)
Flow rate Up to 1.8 slpm
Sample gases Ammonia (NH3) and inert 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 34 lbs (15.4 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)
U.S. Patent #7,277,177
*Vacuum source required
Title / Description

ALOHA H2O Brochure (PDF)

Download file

Moisture Measurement Best Practices Review

Download file