Use

The temperature and humidity probe is used to calculate the compensation factor that is applied to any derived parameter that uses the comp factor.  In Finepointe, these derived parameters are identified with an suffix of a lower case "b" (e.g. TVb, MVb, PIFb, PEFb).  In Ponemah, the derived parameters are designed with a suffix of "adj" (e.g. TVadj, MVadj).  For more information on the compensation factor, please see

• Drorbaugh & Fenn Compensated Tidal Volume (TVadj/TVb)
• FinePointe Whole Body Plethysmography Volume Calculation

Care

FinePointe WBP and Inhalation Tower systems may include Temperature/Humidity probes that are used to measure those values in the air exposed to the subjects.  These probes can drift over time when exposed to VOCs (Volatile Organic Compounds) in the air. 

To assess this possible drift, an additional Temperature/Humidity probe is included with each of these systems.  A red cable identifies this Reference Probe and should remain in its closed static-protected bag to isolate it from airborne VOCs, thereby mitigating possible sensor drift.  The intent of this Reference probe is that the customer can routinely connect it to their system and compare its values to those from the other probes. See WBP Temperature & Humidity Probe Averaging

If a Temperature/Humidity probe is found to have drifted by a significant amount, the customer can then request a Warranty replacement or purchase a replacement if older than 1 year.

Cleaning Instructions

DSI recommends that the temperature and humidity probes are cleaned using an absorbent, lint-free, static-free laboratory wipe (example product includes Kimwipes).  To use, gently wipe the end and body of the probe to remove condensation after each experiment.  If the probe requires a gentle rinse, please ensure only the tip is gentle rinsed.