Schmoleskin
Member
- Location
- Denver, CO, USA
Have a bunch of Rosemount series 3051 pressure transmitters in a C1 D2 space, here is the URL to the unit specs and approvals:
http://www2.emersonprocess.com/siteadmincenter/PM Rosemount Documents/00813-0100-4001.pdf
In the above document, the section for the 3051C series contains a page of approvals, attached here (hope this works):
View attachment 3051C Approvals.pdf
The units do not specifically say "Factory Sealed" or "No External Seal Required" or suchlike, as many other devices do. But I've been told these generally do not require sealing, and want to make sure I understand why, if true.
If not marked as above, 2017 NEC has an exception d. to 501.15 (A) (1) (1), copied below. This is the only reference I can find to nonincendive and/or intrinsically safe in the Art. 501 sealing sections.
d. The switch, circuit breaker, fuse, relay, or resistor is part of a nonincendive
circuit.
Does this, because it is called out as nonincendive and intrinsically safe in its approvals, allow the omission of an external seal?
I checked Art 504, Intrinsically Safe Apparatus, and found this, regarding sealing:
504.70 Sealing. Conduits and cables that are required to be
sealed by 501.15, 502.15, 505.16, and 506.16 shall be sealed to
minimize the passage of gases, vapors, or dusts. Such seals shall
not be required to be explosionproof or flameproof but shall
be identified for the purpose of minimizing passage of gases,
vapors, or dusts under normal operating conditions and shall
be accessible.
Exception: Seals shall not be required for enclosures that contain only
intrinsically safe apparatus, except as required by 501.17.
501.17 Process Sealing. This section shall apply to process connected
equipment, which includes, but is not limited to,
canned pumps, submersible pumps, flow, pressure, temperature,
or analysis measurement instruments.
The documentation appears to show all manner of sealing, which I unfortunately do not understand completely. I think 501.17 requires the equipment/instrument to be adequately sealed against the entry of process chemicals/fluids etc., which it would seem (and I would hope) has been done adequately.
What do you think, is this enough info to determine that these do not require external seals? I am certain I must have missed other stuff, any help would be appreciated...
http://www2.emersonprocess.com/siteadmincenter/PM Rosemount Documents/00813-0100-4001.pdf
In the above document, the section for the 3051C series contains a page of approvals, attached here (hope this works):
View attachment 3051C Approvals.pdf
The units do not specifically say "Factory Sealed" or "No External Seal Required" or suchlike, as many other devices do. But I've been told these generally do not require sealing, and want to make sure I understand why, if true.
If not marked as above, 2017 NEC has an exception d. to 501.15 (A) (1) (1), copied below. This is the only reference I can find to nonincendive and/or intrinsically safe in the Art. 501 sealing sections.
d. The switch, circuit breaker, fuse, relay, or resistor is part of a nonincendive
circuit.
Does this, because it is called out as nonincendive and intrinsically safe in its approvals, allow the omission of an external seal?
I checked Art 504, Intrinsically Safe Apparatus, and found this, regarding sealing:
504.70 Sealing. Conduits and cables that are required to be
sealed by 501.15, 502.15, 505.16, and 506.16 shall be sealed to
minimize the passage of gases, vapors, or dusts. Such seals shall
not be required to be explosionproof or flameproof but shall
be identified for the purpose of minimizing passage of gases,
vapors, or dusts under normal operating conditions and shall
be accessible.
Exception: Seals shall not be required for enclosures that contain only
intrinsically safe apparatus, except as required by 501.17.
501.17 Process Sealing. This section shall apply to process connected
equipment, which includes, but is not limited to,
canned pumps, submersible pumps, flow, pressure, temperature,
or analysis measurement instruments.
The documentation appears to show all manner of sealing, which I unfortunately do not understand completely. I think 501.17 requires the equipment/instrument to be adequately sealed against the entry of process chemicals/fluids etc., which it would seem (and I would hope) has been done adequately.
What do you think, is this enough info to determine that these do not require external seals? I am certain I must have missed other stuff, any help would be appreciated...