Troubleshooting
25
4.6
Testing The Sensing Element
Integral electronics, Ref figure 4-1:
Remove Sensing Element Circuit Board and disconnect cable
from circuit board
Remote electronics, Ref figure 4-2
Disconnect remote cable at the sensing element.
1. With the sensing element in the vessel, verify level is below
the sensing element
2. Use an analog ohmmeter
1
that is set to the R x 1K ohm
scale, measure the resistances between each pair of sensing
element connections.
Ref Figure 4-1 & 4-2
. Record values
in Table 4.1
a. If the process material is conductive, it is normal to
measure some resistance between sensing element
connections. The lowest permissible resistance values
are:
Center Wire to Ground
1000 ohms.
Center Wire to Shield
600 ohms.
Cote Shield to Ground
300 ohms.
b. If all measurements are open circuit the sensing element
has passed the test. If lower resistance was measured
continue with testing.
3. Clean sensing element and repeat resistance measurements
with the sensing element external to the vessel.
a. A clean sensing element should measure an open circuit
on all resistance tests.
b. If the resistance values increase to an open circuit the
resistance was installation or coating related. The most
common causes are:
i. Cote Shield element does not extend sufficiently into
the vessel. Verify the CoteShield element extends at
least 2” into the vessel and past wall build-up.
ii. Extremely conductive coating on the sensing element.
This may require changing the sensing element or
electronics. Contact the factory for recommendations.
iii. Sensing element is touching vessel. A resistance
reading of less than 10 ohms to ground (sensing
element housing or tank) is usually due to a metal-to-
metal short circuit. Verify that the sensing element
is not touching any vessel structure.
Summary of Contents for SIL IntelliPoint RF S*R*L Series
Page 4: ...Contents...
Page 6: ...Section 1...
Page 38: ...SXRXLXX1 SIL IntelliPoint RF Series User s Manual 32 Section 5...
Page 41: ...Specifications 35 Section 6...
Page 43: ...Control Drawings 37 6 1 FM FMc Control Drawings Continued...
Page 44: ...SXRXLXX1 SIL IntelliPoint RF Series User s Manual 38 6 1 FM FMc Control Drawings Continued...
Page 45: ...Control Drawings 39 6 1 FM FMc Control Drawings Continued...
Page 46: ...SXRXLXX1 SIL IntelliPoint RF Series User s Manual 40 6 1 FM FMc Control Drawings Continued...
Page 47: ...Control Drawings 41 6 1 FM FMc Control Drawings Continued...
Page 48: ...SXRXLXX1 SIL IntelliPoint RF Series User s Manual 42 6 1 FM FMc Control Drawings Continued...
Page 56: ...SXRXLXX1 SIL IntelliPoint RF Series User s Manual 50 6 2 ATEX Control Drawings...
Page 57: ...Control Drawings 51 6 2 ATEX Control Drawings Continued...
Page 66: ...SXRXLXX1 SIL IntelliPoint RF Series User s Manual 60 6 4 IECEx Control Drawings...
Page 67: ...Control Drawings 61 6 4 IECEx Control Drawings Continued...
Page 75: ...Control Drawings 69 6 5 Mounting and Wiring for Spark Protector Drawings...
Page 77: ...Control Drawings 71 6 5 Mounting and Wiring for Spark Protector Continued...
Page 78: ...SXRXLXX1 SIL IntelliPoint RF Series User s Manual 72 6 6 Adding a Padded Capacitor...
Page 79: ...Control Drawings 73 6 6 Adding a Padded Capacitor Continued...
Page 80: ...SXRXLXX1 SIL IntelliPoint RF Series User s Manual 74 6 6 Adding a Padded Capacitor Continued...
Page 81: ...Control Drawings 75 6 7 Dual Seal Assembly for 700 Series Sensing Elements...
Page 82: ...SXRXLXX1 SIL IntelliPoint RF Series User s Manual 76 6 7 Dual Seal Assembly Continued...
Page 83: ...Control Drawings 77 6 7 Dual Seal Assembly Continued...
Page 84: ...Appendix A...
Page 88: ...SXRXLXX1 SIL IntelliPoint RF Series User s Manual A 4 Appendix B...
Page 90: ...SXRXLXX1 SIL IntelliPoint RF Series User s Manual B2 EXIDA Report Results...
