Network Controller – GWAB11

GrainWatch™ Network Controller GWAB11, is a hub, an interface between a host reader unit in safe area and the network switches and temperature cables in hazardous area.

GWAB11 has four separate temperature cable inputs. These can either be connected directly to temperature cables or to GrainWatch™ Network Switch GWNET11.

When GWNET11 are used, one GWAB11 can sample temperatures from up to 68 temperature sensor cables. The connection to the reader unit is an addressable RS485 multidrop interface, enabling the unit to communicate with several GWAB11:s on the same connection.

Recommendations

U – Nominal voltage: GWAB11-01: 230VAC, 50Hz
GWAB11-02: 115VAC, 60Hz
P – Nominal power: 5 W
Um – Maximum voltage on any terminal for non-intrinsically safe circuits without invalidating safety: 250 V r.m.s
U – Maximum open circuit voltage on any intrinsically safe terminal: 7.2 V
I – Maximum short circuit current on any intrinsically safe terminal: 281 mA
P – Maximum matched output power on any intrinsically safe terminal: 477 mW
C – Maximum total capacitance on the intrinsically safe terminals: 13.2 µF
L – Maximum total inductance on the intrinsically safe terminals: 400 µH
L /R – Maximum external inductance to resistance ratio on the intrinsically safe terminals: 70 µH/Ω
Ingress protection: IP66
Maximum surface temperature: 85°C
Operating temperature: -20°C – +50°C
Size: L=260 mm, W=160 mm,
H=90 mm
Certifications: IECEx: TUN 10.0013X ATEX: TÜV 10 ATEX 386498X
Marking: IECEx: Ex tb [ia] IIIC T85°C ATEX: II (1D) 2D Ex tb [ia] IIIC T85°C
Maximum number of GWNET11s that can be connected to each sensor cable input in he GWAB11 when using temperature sensor cables GWSL1100/2100: 4
Maximum number of temperature sensor cables GWSL1100/2100 that can be connected to each sensor cable input in the GWAB11 : 17 using 4 GWNET11s
Maximum length of cable that can be used for one sensor cable input in the GWAB11 when using GWNET11s and temperature sensor cables GWSL1100/2100: 1000 m using a cable with max 400pF/m
Maximum number of GWNET11s that can be connected to each sensor cable input in he GWAB11 when using humidity sensor cables GWML3100 : 0 – GWML3100 can not be used together with GWNET11.
Maximum number of humidity sensor cables GWML3100 that can be connected to each sensor cable input in the GWAB11: 1
Maximum length of cable that can be used for one sensor cable input in the GWAB11 when using humidity sensor cables GWML3100: 500 m using a cable with max 400pF/m