2 installation – Yokogawa RotaMASS 3-Series User Manual
Page 79
9. EXPLOSION PrOTECTEd TyPE INSTrUMENTS
9-3
IM 01R04B05-00E-E 3rd edition July 30, 2010 -00
all Rights Reserved. Copyright © 2005, Rota Yokogawa
Flame proof (Ex d) relevant threads at converter housing and covers:
no.
Position of thread
Pitch
thread form +
quality of pitch
threads
engaged
Depth of
engagement
(1) case thread on electronic/display side
2 mm medium, 6H *
)
≥ 6
12 mm
(1) cover thread on electronic/display side
2 mm medium, 6g *
)
≥ 6
12 mm
(2) case thread on terminal box side
2 mm medium, 6H *
)
≥ 6
12 mm
(2) cover thread on terminal box side
2 mm medium, 6g *
)
≥ 6
12 mm
(3) M
thread for cable glands M20 x 1.5
1.5 mm medium, 6H *
)
≥ 10
17 mm
(3) a/F
thread for cable glands 1/2 ´´ nPt
1.814 mm
**
)
**
)
13.571 mm
*
)
acc. ISo 965-1 and ISo 965-3
**
)
acc. anSI B 1.20.1
If terminal enclosure is used as Ex e, the threads (2) and (3) in above table must be not be regarded.
F94.EPS
(1)
(2)
(3)
1. Ex type of RotaMaSS must be connected to the suitable IS earthing system (see installation
diagram). Converter case must have connection to the potential equalisation facility. If the connecting
process tubing is part of the potential equalisation, no additional connection is required.
2. use the certified cable glands, suitable for the conditions of use. the delivered cable glands are only
for Ex e use. For Ex d use d-type cable glands.
3. Please confirm that the ground terminal (inside the terminal enclosure) is firmly connected by means of
a clip-on eye-let.
4. Ex-e terminals for power supply and I/o-lines are designed for cables with cross section of 0.08 mm²
(aWG 28) to 2.5 mm² (aWG12). the strip length must be 5 to 6 mm (0.2 to 0.24 in).
9.1.2 Installation
Installation diagrams for RotaMaSS with/KF3 see in chapter 9.2.2.
Integral type RCCt3
WARNING
Cable glands for power- and I/o-cables :
RCCt3x-xxxM : Ex e types are enclosed. these cable glands can also be used for “dust application” (D).
use atEX-certified Ex d cable glands for Ex d condition.
RCCt3x-xxxa : no cable glands are enclosed. use the atEX-certified cable glands, suitable for the
conditions of use (Ex de or Ex d or dust application).
For “dust application” (D) use cable glands with minimum IP67 protection !