Trace water vapour measurement for non-hazardous gases

SS2000e H2O

rapid speed of response
low maintenance
high accuracy

Using a laser to monitor low levels of water vapour offers a number of key benefits.

This robust, non-contact analyser is highly accurate with an extremely rapid speed of response, and has led the industry to a new era. The ability to monitor water vapour in near real time has led to significantly improved confidence in the measurement, and improved process efficiencies. The speed of response of the analyser enables rapid detection and recovery from process upsets, allowing easier diagnosis of plant problems and rapid return to normal process level, allowing quick return to shipping product.

The graph below shows the difference in response between a laser system and a more traditional aluminium oxide sensor to short bursts of humidity. The laser shows a full scale deflection, while the aluminium oxide hardly shows any change.

 

Speed of response graph

 

  • Non-contact with the process gas - the active measurement system is mounted behind a window, making this technique a robust measurement system with corrosive and contaminated gas streams.
  • Rapid response - near real time process control can be achieved, improving process efficiency and, in some cases, allowing the cost of process plant to be reduced.
  • Low maintenance - with no consumables or moving parts, this analyser has very low operational costs and can provide a short return on investment.

GENERAL

Measurement

Water vapour

Measurement principle

Absorption spectroscopy using a tunable diode laser

Range

0 to 50/100/200/500 or 1000 ppmv
 

Other ranges available on request

Analogue output

4 to 20 mA configurable

Repeatability

± 4 ppm range dependent *

Response time

Typically less than 20 seconds*

Operational temp. range

 -20 to +50 °C

LCD Display

Concentration, cell pressure & temp. & diagnostics

Certification

European

CE marked

Shipping

Shipping weight

Dependent on specification

MECHANICAL

Dimension

Dependent on specification

Material (wetted parts)

316 stainless steel standard *

Pressure to cell

70 kPaG (10 PSIG)

Pressure to sample cabinet 

Between 140 to 350 kPaG 920 to 50 PSIG)

Sample flow rate

0.1 to 4 S l/min.*

Ingress protection

IP66
   

ELECTRICAL

Power

100 to 240 VAC, 50 to 60 Hz, 300 W

Outputs

Current

Qty 2, isolated 4 to 20 mA, 1200 Ω at 24 VDC

Relay contacts

Qty 1 general fault, Qty 1 Hi/Lo alarm

Digital 1

RS-485 half duplex & 10/100 ethernet (standard)

Digital 2

RS-232 (optional)

Protocols

Modbus Gould RTU or Danial RTU or ASCII

* Application dependent

  

All specifications subject to change

  

Sample let-down systems

IMA build bespoke integrated sample systems to provide full measurement systems.

Contact us to discuss your requirements for:

  • sample probes
  • fast loops
  • heated tube bundles
  • pressure reduction & pressure relief
  • filtration