With the Invitro Tewameter® VT 310 a probe for the TEWL measurement is available, which offers all benefits of the Tewameter® and is perfectly suited to sit on a Franz cell.
The probe Tewameter® VT 310 emulates completely the upper part (donor chamber) of a Franz cell (standard is 15 mm Ø, other sizes on request). Thus the probes sits exactly on the membrane of the Franz cell as it would sit on skin directly without needing further adapters. The measured TEWL-value is expressed in g/h/m², the worldwide acknowledged absolute measuring value for skin.
No other probe offers this possibility.
If needed, the probe can also be used on a centerpiece of high quality Teflon, which fits exactly on the probe and the receptor chamber of the Franz cell without further fixing adapters. The thus measured TEWL has to be regarded relatively (no longer absolute figures as the distance between probe and membrane is changed).
In vitro TEWL measurements have a variety of different applications:
Other related probes available:
The open chamber measurement of the Tewameter® is the only method to assess the TEWL continuously, which is necessary for most applications without influencing the skin surface. Numerous studies are available.
Dimensions: Length: 6.5 cm, Measuring chamber: Height: 2 cm, Inner Ø: 1.5 cm, Outer Ø: 3 cm, Cable length: 1.3 m, Weight: approx. 60 g
Teflon-centerpiece: Height: 2.5 cm, Inner Ø: 1.5 cm, Outer Ø: 3 cm
These data apply to the standard probe for a 15 mm Ø Franz cell, for customized sizes they will partly vary.
Resolution: relative humidity ± 0.01 % RH, Temp.: ± 0.01 °C, TEWL: 0.1 g/h/m², Measuring area: TEWL 0-320 g/h/m²
Operating conditions: T: 10-40° C, RH: 30-70 % RH
Measurement Uncertainty: for 10° C to 40° C and TEWL-values lower than 70 g/h/m²:
TEWL: ± 10 % of the measured value plus ±1 g/h/m² for RH between 5 % and 90 %, ± 15 % of the measured value plus ± 2 g/h/m² outside this range
Temperature (T): ± 0.2 °C for 10 °C to 60 °C and ± 0.5 °C outside this range
Relative humidity (RH): ± 2.0 % for 5 to 90 % RH and 10 °C to 60 °C, ± 3.0 % outside these rangesTechnical changes may be made without prior notice.