ROTRONIC Hygrogen2 - Manual (Page 56)

E-M-HG2-S-V2.1
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroGen2: Humidity and Temperature Generator
with AutoCal/AutoCal+, Remote Control and
Range Extensions options.
Instruction Manual
Instruction Manual for Software
Version 2.1
Document Type
Page 52 of 75
Document title
8 Servicing and Maintenance
8.1 Control HygroClip Calibration
To remove the control HygroClip for calibration, turn off the HygroGen2 auto Control and remove the
door. Reach into the chamber and unscrew the HygroClip from its mounting connector. Take care not
to cross the threads on the collar when refitting.
To minimise HygroGen2 downtime, alternative calibrated probes can be fitted in place of the existing
probe.
8.2 Desiccant
The HygroGen2 uses a desiccant when lowering humidity in the chamber. The desiccant condition is
shown within the Settings screen. This shows an approximate indication of the dew point within the
dryer cell.
If the HygroGen2 does not reach low RH set-points promptly, check the desiccant condition and
replace as required.
The measured desiccant value is established when the dryer is active and a flow of air from the
desiccant cell is passing over the desiccant sensor; this value is held when the dryer is active to provide
the user with an indication of the desiccant condition even if the dryer is not used. To update the
value, run the HygroGen2 on the lowest RH set-point (5%rh) for at least 15 minutes.
Changing Desiccant
Remove the desiccant cell from the HygroGen2 by pulling firmly on the cell cap (Figure 1(5)). The cell
is held in place securely to maintain an air-tight seal; a gentle twist will help removal. Changing the
desiccant should be undertaken in a ventilated area.
Observing the diagram below (Figure 36), remove the cap and pour out the used desiccant material
and replace with new or regenerated material. Avoid exposing the replacement desiccant unduly to
the atmosphere.
© 2014; Rotronic AG E-M-HG2-S-V2.1