CI-302 High Pressure Diffuser


In business for over 55 years, Climet has dozens of multi-jurisdictional patents in the field of particle counting. Che CI-302 is compliant with ISO 8573-4, and is autoclavable.

General information

The CI-302 High Pressure Diffuser is used when sampling pressurized air or gases with Climet particle counters or microbial air samplers. Applying compressed air or gases directly to a particle counter or microbial sampler may cause damage to the instrument. With particle counters it will also cause turbulence inside the sensor that produces false high counts, and will also result in undersizing particles.

The CI-302 works by regulating the flow rate with an exhaust port to provide a path for the excess air pressure. This allows the particle counter to "pull in" and regulate the flow into the instrument.

Common gases used in sampling are air, nitrogen, argon, helium and carbon dioxide.  The mass flow is affected by the density of the gases being sampled.  Air and nitrogen have virtually the same density.  However, argon, helium, and carbon dioxide have different densities that shift the air flow.  When sampling argon, helium and carbon dioxide it is highly recommended to have the particle counter or microbial sampler's flow rate calibrated for the particular gas being sampled. 

The CI-302 is compliant with ISO 8573-4, and is autoclavable.

Interoperability is assured with all Climet microbial samplers, and particle counters (excluding the RS version).  

When used with Climet microbial samplers, a High Pressure Diffuser Adapter Head (p/n: 01210109) will be required.

The low pressure end of the diffuser has a dual size outlet fitting.  This allows 1/2" or 3/8" tubing to be connected between the CI-302, and the particle counter inlet or microbial adapter inlet.  On the high pressure end, a 1/4" tube connection is compatible with a number of fittings. 

The standard and recommended fitting on the high pressure end end is a VCO fitting

Selecting the Right HPD

In choosing the right High Pressure Diffuser (HPD) please download the datasheet, and follow these steps:

STEP 1: Confirm the flow rate of the Climet particle counter or microbial sampler? This is referred to as the "Low Pressure End".

STEP 2: Confirm the pressure of the gas being sampled? This is referred to as the "High Pressure End". You will want to determine the gas pressure after the filter.

STEP 3: The High Pressure End of the diffuser comes with an industry standard VCO fitting. If you would like to use another type fitting, please contact us.

STEP 4: Refer to the appropriate chart (below) for the Flow Rate of the Climet particle counter or microbial sampler. (The 1 CFM, 50 LPM, 75 LPM or 100 LPM Chart)

STEP 5: At the top of the chart is the pressure of the gas being sampled (Refer to Step #2 above). Go to the appropriate column.

STEP 6: Drop down to the blue rows. The number provided in the blue row is the maximum pressure on the low pressure side measured in Liters Per Minute (LPM). Generally, you will choose the part number (Far left column) on the top blue row with lowest number.

When sampling, we recommend not trying to regulate pressure by hand, but rather fully open the pressure inlet, and let the High Pressure Diffuser exhaust the excess compressed gas.