Installation - HPP271

HPP271 User Guide

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User guide
When you choose the installation location for the probe, consider the following:
  • Choose a location that represents the environment and process you want to measure. Some factors may make a location unrepresentative of the process:
    • Materials that absorb H2O2, such as several plastics, rubbers, and sealing materials
    • Limited air flow
  • The probes withstand bio-decontamination process conditions. For signal cables, you must verify their suitability in the installation environment.
  • The probes withstand high air flow rates.
  • The probe is intended for use in atmospheric pressure. Do not install the probe in a vacuum.
CAUTION Note that in installations where only part of the probe is installed inside the process, the temperature outside of the process can have an effect on the probe measurement accuracy, especially if the temperature difference is significant. In installations where part of the probe is outside of the process that is measured, apply adequate thermal insulation around the probe part and cable outside the process.

When there is H2O2 in the probe's environment, the probe must always be powered on. When powered on, the PEROXCAP sensor is heated, which permits using the probe in condensing H2O2 conditions, maintains measurement performance, and lengthens the probe's lifetime.

CAUTION The filter is an essential part of the measurement. If the filter is broken, dirty, or removed altogether, measurement does not work as intended.
  • Do not touch the filter with bare hands. If you need to touch the filter, always use clean gloves (rubber, cotton or similar material).

  • Keep the filter free of any grease or oil.

  • Do not touch any parts under the filter. Touching parts under the filter may damage the sensors.

Example: Installation through a wall, gland option

A through-wall installation is recommended especially in very harsh processes.

Seal the lead-through on the metal body of the probe.

The figure shows an example installation using Vaisala spare part gland HPP271MOUNTINGSET1.

Nut for tightening the probe in place
Nut for mounting the gland

Example: Installation through a wall, flange option

The figure shows an example installation using Vaisala spare part flange (HPP271MOUNTINGSET2), including the drilling dimensions for the flange.

Seal the lead-throughs on the metal body of the probes.

Screws for tightening the flange in place (4 pcs, Ø 5 mm)

Example: Installation entirely in process environment

Mount the H2O2 and humidity probe from the probe body.

The figure shows an example installation using Vaisala spare part wall mounting set (HPP272WALLMOUNT).

Let the signal cable hang loosely so that it makes a bend. This prevents condensing water from running to the probe along the cable. Do not hang the probe by the signal cable.

Make sure the signal cable you use is suitable for your bio-decontamination process.