User Manual HTS801
Humidity and Temperature Sensor for High Humidity and Chemically Polluted Conditions | 13
PLEASE NOTE
When heating has ended, the system blocks any subsequent heating for 30 minutes. In other words, if the
ambient humidity remains above the defined set point after the initial heating, the next heating starts again
after 30 minutes.
3.4.4.
High Humidity Guard (H
2
G) against Continous High Humidity and Condensing Conditions
In environments with continuous high humidity even the smallest deviations between the temperature of
the.sensor.head.and.the.ambient.temperature.can.cause.condensation..Dew.on.the.RH / T.sensing.element.
influences the measurement accuracy and increases the risk of deposits on the active sensor surface that lead to
parallel resistances and parasitic capacitances.
The dual heating system of the HTS801 prevents both: condensation on the RH sensing element and on the
probe body by a regulated heating strategy. This leads to very short response time and fast recovery after
condensing conditions. Furthermore, it enables accurate RH measurement even under continuously high humidity
and condensing conditions. RH and T can be determined precisely with the help of the heated monolithic sensing
element and the calculated dew point.The relative humidity near condensation is determined with the T value of
an.additional.T.sensor.of.Type.T17 / T28.
The following HTS801 types incorporate the dual heating system:
T17: with additional T Sensor included for RH measurement
T28: with additional T Sensor included for RH measurement in meteorological applications
T7: one probe design for Td measurement only
3.5
Optional Features
3.5.1.
TFT Colour Display
This option includes a 3.5" TFT colour display and push-buttons for full configuration.
Configuration Menu
Detailed information on the configuration menu see chapter 11 Appendix: Display Menu Structure.
Menu
Data logging
Configuration.of.the.data.logger/graph.-.sampling.rate.|.graphs
Display settings
Display layout - measurands | brightness | orientation | display alarm
Analog output
Output.configuration.-.mode.|.measurands.|.scaling.|.error.indication
Heating mode settings
ARC.and.CG.configuration.-.activation.|.deactivation.|.parameters
Alarm output*
Relay.configuration.-.mode.|.set.points.|.state
Customer
adjustment
Adjustment.-..1.and.2.point.humidity/temperature.adjustment.|.
reset to factory adjustment | calibration status
Modbus settings*
Configuration.of.Modbus.RTU.data.transmission
IP settings*
Configuration.of.Ethernet.module
Device settings
Settings - language | date, time | parameters | password protection
Status
Status and device information
* Menu only available with the corresponding optional module.
Fig. 9
Principal configuration menu structure
