Strain Gage Full Bridge For Applications In Areas With Potentially - HBM ClipX Bedienungsanleitung

6.6.2 Strain gage full bridge for applications in areas with potentially explosive
atmospheres
You cannot use transducers with TEDS when using Zener barriers (safety
barriers).
Use the following components to connect transducers in areas with potentially explo-
sive atmospheres to the ClipX (measuring circuit type Ex II (1) GD, [Ex ia] IIC):
• Safety barriers 1-SD01A from HBM (Zener barrier)
• Cable KAB7.5/00-2/2/2 from HBM, LF-ZYAECVY 3x2x0.14 mm
1-CABE2/20 or 1-CABE2/100, or
• Lappgroup cable (www.lappgroup.com): Li2YCYPMF 3x2x0.5 mm
The connection resistance of the sensor (or of multiple parallel configured sensors)
must be between 80 and 5000 Ohms. The maximum line length is 100 m.
See also „Available connections and LEDs" on page
Strain gage full bridge in 6-wire configuration
Pt100 Pt100
TEDS
S
4
1
2'
2
3'
3
AI
I
U
Abb. 22: Plug terminal X4, 6-wire pin assignment
Important: Note that transducers between 350 and 5000 Ohms may only be
operated with DC bridge excitation voltage. Also read the safety instructions
for the safety barrier SD01A in the operating manual.
42
HBM cable KAB7.5/00-2/2/2
cable wire colors:
bu = blue; gn = green; gy = gray;
rd = red; bk = black; wh = white;
Measurement signal
Measurement signal +
Sense lead −
Bridge excitation voltage
Sense lead +
Bridge excitation voltage +
Cable shields
24.
−
5
Z961H
8
−
5
Z961
8
5
Z961H
8
Potential equalization
2
, ordering number
2
Safe Explosion hazard
area area
rd
4
wh
1
bk
4
1
bu
1
gy
4
gn
1
Electrical connections, LEDs
2
4
3
ClipX