ROTRONIC Hygrogen2 - Manual (Page 62)

E-M-HG2-S-V2.1
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroGen2 Humidity and Temperature Generator:
Instruction Manual
Appendix
Instruction Manual for Software
Version 2.1
Document Type
Page 58 of 75
Document title
Chilled mirror probes are convenient for dew point ranges above ambient as they are immersed in the
conditions and therefore condensation in sample lines need not be considered.
Figure 37: RP2 Head fully inserted into HygroGen2 door
Make sure the mirror is positioned so that moving air within the chamber flows over the mirror
surface.
External sample loop operation
To use a HygroGen2 with a chilled mirror that has an external sampling head, connect via the heated
sample loop points on the back panel (Figure 2, items 1 & 2). The HygroGen2 sample ports and internal
tubing are automatically controlled to 5°C above the chamber temperature to eliminate the possibility
of condensation formation.
The connecting lines to the mirror must also be heated if the set chamber conditions create a dew
point temperature higher than the ambient conditions. Make sure that your chilled mirror operating
capability is within the required range. For humidity values with a dew point below ambient
temperature, heated sample lines are not required.
Remove the blanking caps fitted to the sample loop Swagelok fittings and use nuts and olives to
connect the sample tubes from the chilled mirror. 6mm OD FEP or stainless tubing should be used to
connect the sample loop out and return ports to the chilled mirror unit. If the mirror instrument does
not have a built-in pump, flow meter and regulator, we recommend including these in the sample loop
(after the mirror) to confirm the air flow rate required by the chilled mirror instrument (typically
0.5l/min).
© 2014; Rotronic AG E-M-HG2-S-V2.1