Vaisala HMT310 - Manual (Page 19)

Chapter 2 ___________________________________________________________ Product Overview
VAISALA ________________________________________________________________________ 19
Filter Options
There are several filter types for HMT310. All filters are 12 mm in
diameter with a female thread, and are compatible with all HMT310
probe models. The filters recommended for a probe type can be selected
on the corresponding HMT310 order form.
For a list of the available filters and ordering information, see section
Spare Parts and Accessories on page 93.
Sensor Options
HMT310 uses Vaisala’s HUMICAP ® capacitive thin-film polymer sensor
for humidity and temperature measurements. The HUMICAP ® sensor
options (selected when ordering according to transmitter type and
application, also available as accessories) include:
- HUMICAP®180R: general purpose humidity and temperature sensor
- HUMICAP
® 180RC: composite sensor for chemical purge and probe
heating
- HUMICAP®180VHP: catalytic sensor designed for environments
with vaporized hydrogen peroxide (H
2
O
2)
- HUMICAP®180VHPC: catalytic sensor with chemical purge for
H
2
O
2
environments
HMT310 also uses the Pt 100 (Pt 100 RTD Class F0.1 IEC 60751)
temperature sensor.
The Vaisala HUMICAP® sensor is compatible with direct H
2
O
2
exposure even at high concentrations and hundreds of H
2
O
2
cycles up to
saturation. The long term performance is very good at concentrations
higher than typically used for sterilization. However, for applications
where full saturation is possible, Vaisala recommends using either the
HUMICAP®180VHP/180VHPC catalytic sensor, or the catalytic filter
(order code 231865) for HUMICAP®180R/180RC sensors to protect the
sensor and extend the calibration interval.