Installation - HPP271 - HPP272

HPP271 and HPP272 Quick Guide
Document code
M211887EN
Revision
E
ft:locale
en-US
Product
HPP271
HPP272
Document type
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:
    • Heat sources
    • 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.
  • HPP272 only: For condensation monitoring with relative saturation, consider installing the probe close to a surface where condensation may form (typically, on cooler surfaces in the bio-decontaminated space).
  • The probe is intended for use in atmospheric pressure. Do not install the probe in a vacuum.

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.

HPP272 only: Accurate relative humidity (RH) and relative saturation (RS) measurement requires both humidity and temperature data from the same environment. Install the main body of the probe (H2O2 and humidity measurement) and the attached temperature probe in the same measurement environment, approximately 6 ... 10 cm apart from each other, so that the conditions are the same for both elements. Do not install the temperature probe directly above the H2O2 and humidity probe, as moderate heat rising up from the H2O2 and humidity probe body may affect the ambient temperature around the temperature probe.

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-throughs on the metal body of the probes.

The figure shows an example installation using Vaisala spare part glands (HPP272MOUNTINGSET1).

1
Nut for tightening the probe in place
2
Nut for mounting the gland

Example: Installation through a wall, flange option

The figure shows an example installation using Vaisala spare part flange (HPP272MOUNTINGSET2), including the drilling dimensions for the flange.

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

1
Screws for tightening the flange in place (4 pcs, Ø 5 mm)
2
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.

1
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.

Mount the temperature probe from the metal body. Note that the temperature sensor is at the tip of the temperature probe.

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.
The examples in this section show how to install HPP272. The same instructions apply to HPP271 installation with the exception of the external temperature probe. For more information on installation accessories, see HPP271 and HPP272 User Guides at the docs.vaisala.com documentation portal.