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Description
Dew point control switch
HYGRASREG® TW
The HYGRASREG® TW dew point control switch is installed on cooling or cold-water piping, or on cooled surfaces. It reliably detects the formation of condensation by means of its humidity and temperature sensor (no conductivity measurement) and provides precise measuring results thanks to its patented measuring method of pro-dynamic cross-convection (Patent No. DE 102012 015 726.6). The sensor device is available with/without optional display.
Dew point temperature is the temperature at which air reaches the state of saturation and water vapour starts to condensate. Facilitated by a measuring range of 0...100%relative humidity (TW-U device version) and by an adjustable threshold value of 75...100%relative humidity (TW-W), it is possible e.g. to operate cooling ceilings so that the switching output of the dew point monitor, the DDC, is activated and then triggers a heater or other control elements to prevent the formation of dew before it builds up on pipes or cooling ceilings of the property to be monitored.
Technical details
Power consumption
< 1.1 VA/ 24 V DC ; < 2.2 VA/ 24 V AC
Data points
Relative humidity [% RH]
Sensor protection
membrane filter
Medium
clean air and
non-aggressive, non-combustible gases
non-aggressive, non-combustible gases
Electrical connection
AWG 16 - 26 via terminal screws
Cable connection
cable gland, plastic (M 16 x 1.5; with strain relief, exchangeable, max. inner diameter 0.4 in) or
M12 connector according to DIN EN 61076-2-101 (optional on request)
M12 connector according to DIN EN 61076-2-101 (optional on request)
Cable gland
M 16 x 1.5, including strain relief, exchangeable,
max. inner diameter 0.4 in
max. inner diameter 0.4 in
Installation
TW with strap for direct mounting on pipes
or for direct mounting on flat surfaces
(e.g. walls, ceilings) TW - external with detached sensor head
(cable length KL = 2 m) for mounting on pipes
or for direct mounting on flat surfaces
(e.g. walls, ceilings) TW - external with detached sensor head
(cable length KL = 2 m) for mounting on pipes
Protection class
III (according to EN 60 730)
Protection type
IP 65 (according to EN 60 529)*
Protection type housing
IP 65
Standards
CE conformity,
electromagnetic compatibility according to EN 61326,
according to EMC Directive 2014/ 30/ EU
electromagnetic compatibility according to EN 61326,
according to EMC Directive 2014/ 30/ EU
Function
The relay output is triggered (contact 13 -11 closed)
if the pre-set switchpoint (factory setting 75 % r.H.)
is not reached and opens (contact 12 -11 closed)
in the event of an error (power failure, condensation). LED short pulses =
relay active switchpoint not reached
ACTUAL humidity < pre-set switchpoint (no condensation)LED long pulses =
relay inactive switchpoint exceeded
ACTUAL humidity > pre-set switchpoint (condensation)
if the pre-set switchpoint (factory setting 75 % r.H.)
is not reached and opens (contact 12 -11 closed)
in the event of an error (power failure, condensation). LED short pulses =
relay active switchpoint not reached
ACTUAL humidity < pre-set switchpoint (no condensation)LED long pulses =
relay inactive switchpoint exceeded
ACTUAL humidity > pre-set switchpoint (condensation)