GOBI 77 Model DEHYDRATORS FOR COAXIAL CABLES
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Dehydrators for Coaxial Cables
DEHYDRATORS FOR COAXIAL CABLES
Model
GOBI 77
(Suitable for fully continuous and automatic operation)
Dehydrators Model GOBI77
Edition: July, 2021 Page 1
Dehydrators for Coaxial Cables
General Description
The Dehydrators GOBI77 are automatic regeneration equipments, designed to protect
coaxial cable systems with limitless capacity (suggested up to 3600 liters). Able to supply ≥
0,58 SCFM or 990 Nl/h of dry air at a working pressure set in the range of 25 ÷ 40 kPa (other
range on request min. 5 max 60 kPa).
The functioning principle of automatic regeneration is based on the alternating use of two
pumps and two sections of desiccant tanks. The air, taken in by the pump, is dehydrated trough
the desiccant tanks and then compressed in order to have a pressure for the pressurization of
the cables.
By means of a pressure regulator, a safety valve and some sampling instruments as a
pressure gauge, a humidity indicator, etc., the pressure is reduced and the dew point of the air
inflated into the cables is under control. The Flowmeters detect in real time the status of the air
leakages of the system.
The automatic regeneration system is equipped with two sections, each of them containing
one pump and two desiccant tank. The tanks hold a non-toxic chemical salt able to keep the
humidity of the air and then to discharge it through heating. A timer manages the alternation
between the two sections in order to regenerate the salts of two tanks while the other
dehydrates the air. The exchange happens every three hours for only 45 minutes of heating to
have always the guarantee of the dry air available.
Through the restrictions for the regeneration of salts, and working in pressostatic
mode, the system continues to exchange air with the cables. This air exchange allows
constantly to wash the cables that might contain moisture.
The equipment have two air compressors at operation alternately to guarantee a
double duration and avoid the use of solenoid valves (cause of many failures).
The pumps are diaphragm type, with movement to the connecting rod and rotation motor
without brushes. They have a low electrical input and don’t need break-away current. These
pumps are without lubrication, so there’s no risk of the pollution of the air taken in the guide.
Moreover since they work at low pressure, their wear and consequently their maintenance are
very limited (up to 30.000 hours).
The dehydrator is equipped with a locking system pumps in the event of an abnormality of
the logic of the programmer. In this way, if one of the two pumps were to suck air from the
column in the regeneration phase, prevents the entry of humid air in the cables.
A irreversible hours counter starts to count when the pumps are turned ON, so it shows the
total real time of functioning of the pumps.
Dehydrators Model GOBI77
Edition: July, 2021 Page 2
Dehydrators for Coaxial Cables
Technical characteristics
Technical characteristics Code GOBI77
Output Flow Rate : ≥ 0,58 SCFM or 990 Nl/h
Number of outlets : 4 (3/8”) with outlet cocks each
Volume capacity : 1800 liters/4h - 3600 liters/8h – 7200 liters/16h
Working pressure range : 25 ÷ 40 kPa
(other on request min. 5 max 60 kPa)
50 kPa during the regeneration phase
Applications : Wall, Rack 19”, Rack 21”
Pressure indication : Analog Pressure gauge 0 ÷ 60 kPa
Leakages monitor : n°4 Flowmeters 30 ÷ 300 l/h
High Humidity presence : Humidity indicator with change of salt’s color
and Electronic Humidity Alarm
Regeneration type : Automatic - more than 5 years before change salts
Dew point : Better than – 40°C @ 20°C Tamb. e 80% R.H.
Over pressure protection : Safety valve fixed at 55 kPa ± 10%
Air compression : 2 diaphragm pumps with alternatively working
Desiccant salts type : AA 35
Quantity desiccant salts : 2 lt total
Working temperature : -10 + 40°C
Storage temperature : -20 + 60°C
Power supply
Voltage : 230 Vac +/- 10% – 50/60 Hz
Current absorption max : Normal working 0,55 A
: Salts reactivation (for 45 min. every 3 hours) 1,4 A
Electrical connection : IEC socket
Power supply cable type : cross-section > 1 mm² designation H05VV-F or H05VVH2-F2
Analog hours counter : up to 100.000 hours not resettable
Functions and alarms
Functions and alarms : Led Light of dehydrator ON
Lack of main supply alarm
Low pressure alarm @ 22 kPa Off
Manual functioning alarm when CP is switched
Efficiency control : indication of pump 1 working
indication of pump 2 working
indication of tank 1 regenerating
indication of tank 2 regenerating
indication and alarm of warmer 1 broken
indication and alarm of warmer 2 broken
wrong cycle alarm with automatic blocking system
Hygrostat electronic alarm : High humidity alarm @ > -10°C of Dew point
Tele alarms type : Grouped with dry contact switch (No – C – Nc)
Tele alarms connections : To the 9 poles Sub-D jack
Alarms cable type : Couple cable
Sizes and weight
Application wall : 482 (l) x 310 (h) x 290 (p) mm
Application rack 19" : 482 (l) x 310 (h) x 245 (p) mm
Application rack 21” : 535 (l) x 310 (h) x 245 (p) mm
Net weight MAX : 18 kg
Dehydrators Model GOBI77
Edition: July, 2021 Page 3
Dehydrators for Coaxial Cables
Directives CEE
EEC directives : 93/68/CEE e 92/31/CEE
2002/95/EC RoHS Compliance
Quality standard : Under UNI EN 29001
Installation accessories included
Power connector : n° 1 IEC socket
Alarms connector : n° 1 female connector with plastic case
Hose PR-5 Ø10 : 25 meters
Output angle adapters : n° 4 plastic L code H2291 (Dehydrator side)
Quick release union elbow Ø10 : n° 4 code H22106 (Cables side)
Adapter connector for 1/8” : n° 4 code H0905
AIR DIAGRAM
CABLES
4 13 14
1 2 6 12 3 5 11 10 9 7 8
1) Air-inlet filters 6) Regeneration heaters 11) Electronic humidity probe
2) Desiccant thanks 7) Pressure gauge 12) Regeneration restrictions
3) Diaphragm pumps 8) Safety valve 13) Flowmeter
4) Pressure regulator 9) Pressure Control 14) Air outlet cocks
5) Logic of control 10) Humidity indicator
Dehydrators Model GOBI77
Edition: July, 2021 Page 4Dehydrators for Coaxial Cables
Mounting and size
Application on wall
464,5
235 310 (7U) 290
437
482,5 (19”)
Rack 19" application
464,5 437
248
235 310 (7U)
40
482,5 (19”)
Rack 21" application
515 437
248
250 310 (7U)
40
535 (21”)
Sizes in mm
Dehydrators Model GOBI77
Edition: July, 2021 Page 5Dehydrators for Coaxial Cables
Pneumatics configurations with accessories
DEHYDRATOR’S AIR OUTPUT
Fast insert elbow
code H2291
HOSE PR-5
Code M0331
Adapter for connectors of 1/8” code
H0905
Quick release union:
- elbow 90° code H22106
- in-line code H2229 (optional)
Dehydrators Model GOBI77
Edition: July, 2021 Page 6Dehydrators for Coaxial Cables
PR-5 HOSE FOR THE TRANSPORT OF DESICCATED AIR
TUBO PR-5 PER IL TRASPORTO DI ARIA ESSICCATA
Data sheet
Rev. March, 2009
Denominazione / Name .............................. : PR-5
Designazione / Uses ................................... : Trasporto di aria essiccata per la protezione
di Guide d’Onda e Cavi coassiali.
Transport of desiccated air for protection of
Wave Guides and Coaxial Cables.
Campo di applicazione / Applications note . : Idoneo per tutti gli agenti atmosferici
Suitable for every atmospheric agent
Grado di impermeabilità ..............................
............................... [°C di P.d.R ogni 10 m] : < 2 @ 20°C Tamb. & 80% U.R.
Impermeability degree ..................................
....................... [°C of Dew point each 10 m] : < 2 @ 20°C Amb. Temp. & 80% R.H.
Dimensioni / Dimensions .................... [mm] : est. Ø 10 – int. Ø 8
Tolleranza / Tollerance ..................... [mm] : ± 0,07 sul Ø est / on outside Ø
Peso / Weight .................................... [g/m] : 26,06
Tolleranza / Tollerance ......................... [%] : ± 0,5 sul peso / on the weight
Raggio minimo di curvatura ................[cm] : 6,0
Minimum Radius of curvature
Pressione di esercizio max ................ [bar] : 7,0 @ 20°C
Working pressure max
Resistenza allo scoppio ...................... [bar] : 21,0 @20°C ÷ 12,0 @ 60°C
Burst pressure
Allungamento a rottura ......................... [%] : 400 ÷ 600
Tension at straight ........................................
Temperatura di funzionamento ........... [°C] : - 40 ÷ + 60
Temperature range
Temperatura di installazione ............... [°C] : - 10 ÷ + 60
Installation temperature range
Durezza / Hardness..................... [Shore D] : 46
Colorazione / Colors .................................. : Nero / Black
Confezioni standard / standard packaging [m]: 50 – 100 – 200 - 500
Proteggere da /Protect to: Acquaragia – Ammoniaca – Benzene – Benzolo – Carburante
per jet – Cloroformio – Etere – Etile cloruro e dicloruro – Fluoro
– Freon 12/22 – Idrogeno – Metiletilchetone – Metile e Metilene
cloruro - Nafta – Olio combustibile – Olio lubrificante – Olio
minerale – Ozono – Petrolio – Sodio ipoclorito – Solforico acido.
Code M0331
Dehydrators Model GOBI77
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