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User Manual EE300Ex Humidity / Temperature Sensor
Example: Calculation of maximum cable length
Cable 0.75mm²
(0.01in
2
)
: R
cable
= 0.0267 Ω/m
Load resistor:
R
L
= 200 Ω
Input voltage for sensor: V
S
= 16 V
Min. supply voltage EE300Ex: V
Bmin
= 9V + 200Ω * 0.02A = 13V
Maximum voltage drop on cable: V
cable
= V
S
- V
Bmin
= 16V – 13V = 3V
Total cable resistance:
R
cable total
= R
cable
* L
total
* 2 (supply and return line)
V
drop
= R
cable total
* I
out max
=
= R
cable
* L
total
* 2 * I
out max
Transform in accordance with L
total
L
total
= V
drop
/ (I
out max
* 2 * R
cable
)
L
total
= 3V / (0.02A * 2 * 0.0267Ω/m )
L
total
= 2800m maximum cable length
Caution: This is the maximum length without allowing the intrinsic safety area. Cable capacity
and inductivity may reduce the cable length.
4.6 Selecting a Suitable Intrinsically Safe Supply Unit for ATEX Zone Concept
Example for evidence of the intrinsic safety in accordance with EN 60079-14:2008 12.2.5.2,
EN 60079-25:2010 13.1.
CH1 and CH2 are galvanically isolated. The proof of intrinsic safety shall be
performed with appropriate equipment.
Example:
Installation in Zone 0 of the EE300Ex without display
Connection cable length: 300 m (984 ft)
Explosion group: IIC
Temperature class: T4
CH1 and CH2 connected by one single cable.
Intrinsically safe power supply device STAHL 9160/13-11-11 (see accessories)
(Extract from the EC-Type Examination Certificate)
Certified according to:
II 3 (1) G Ex nA nC [ia Ga] IIC T4 Gc (certificate number: DMT 03 ATEX E 010 X)
II (1) D [Ex ia Da] IIIC (certificate number: DMT 03 ATEX E 010 X)
Entity parameters:
U
0
= 27 V
I
0
= 88 mA
P
0
= 576 mW
C
0
IIC = 90 nF
C
0
IIB = 705 nF
L
0
IIC = 2.3 mH
L
0
IIB = 17 mH
Technical data for the connection cable:
Cable type:
ÖLFLEX® EB CY from Lapp Kabel
Cable cross-section:
4 x 0.75 mm² (0.06x0.01 in²)
Operating capacity:
110 nF/km
Inductivity:
0.65 mH/km
Cable capacity for 300m (984ft): CK = 0.3km * 110nF/km = 33nF
Cable inductivity for 300m (984ft): LK = 0.3km * 0.65mH/km = 0.195mH
Summary of Contents for EE300Ex
Page 31: ...31 User Manual EE300Ex Humidity Temperature Sensor 8 ATEX Certificate...
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Page 35: ...35 User Manual EE300Ex Humidity Temperature Sensor 9 EU Declaration of Conformity...
Page 51: ...51 User Manual EE300Ex Humidity Temperature Sensor 13 Control Drawing M1_1309080...
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