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Precision Digital

Model PD680
& PD682

 Meter

Loop-powered Panel Meter

The PD682 is a low cost digital panel meter that can be mounted in hazardous locations to provide on the spot display of important process variables in engineering units. And its 1 volt drop means the PD682 won't overload a loop that's protected by intrinsic barriers.

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FMPD682 only
Model PD682 photo
Features

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Ordering Information

Ordering Information  

Model: Description:
   *PD682 FM Approved Loop-powered Panel Meter
   PD680 Loop-powered Panel Meter
   PDA2405 NEMA 4X Front Panel

See also: Precision Digital Enclosures.

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Specifications

APPROVAL: FM approved as intrinsically safe with entity, for use in Class I, Division 1, Groups A,B,C,D hazardous locations, and Class II and III, Division 1, Group E,F,G hazardous locations when installed in Precision Digital enclosures PDA2407, PDA2408, PDA2409 or PDA2410.

Nonincendive for use in Class I, Division 2, Group A,B,C,D hazardous locations when installed in an enclosure capable of accepting one of the Division 2 wiring methods specified in the National Electric Code (NFPA 70), including Precision Digital enclosures PDA2407, PDA2408, PDA2409 or PDA2410.

Suitable for use in Class II and III, Division 2, Group F,G hazardous locations when installed in Precision Digital enclosures PDA2407, PDA2408, PDA2409 or PDA2410.

Hazardous Area Approval Explanations
INTRINSIC SAFETY: This method of protection limits the energy passing into the hazardous area. The energy limitation is provided by the use of safety barriers which are mounted in the safe area. Because of the energy limitation, regardless of the fault in the hazardous area, sufficient energy cannot be released to ignite the explosive atmosphere.

Approval Methods: There are two methods used by approval authorities to assure an intrinsically safe system:

System Approval: The system approval method is one in which specific field devices are examined in combination with specific barriers. No other field device or barriers may be substituted unless specifically examined by the approval authority.
Entity Approval: The entity approval method is one in which each piece of equipment is evaluated separately and assigned a set of safety parameters. The field device may then be connected to a barrier with compatible safety parameters.

 NONINCENDIVE: A device may be installed in Division 2 locations if it has been approved as nonincendive. Nonincendive equipment is incapable of releasing sufficient electrical or thermal energy to ignite flammable gases or vapors under "NORMAL" operation and environmental conditions. Nonincendive devices need no special enclosure or other physical safeguard.
EXPLOSION PROOF: This is the most popular method of protection. When an explosive gas enters an enclosure containing electrical equipment an explosion could occur. With the enclosure properly installed, and the tight tolerance between the enclosure and the cover, the flame will cool sufficiently by the time it reaches the outside atmosphere.

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