PD685
intrinsically safe, NEMA 4, type 4X, iP67 Loop-Powered Meter
www.predig.com
3
Warnings:
READ AND UNDERSTAND THE MANUAL BEFORE OPERATING.
LISEZ ET COMPRENEZ LE MANUEL AVANT DE L'UTILISER
The following warnings apply to Division 2 installations only!
WARNiNg:
EXPLOSION HAZARD – DO NOT DISCONNECT EQUIPMENT
OR REMOVE THE COVER UNLESS POWER HAS BEEN
SWITCHED OFF OR THE AREA IS KNOWN TO BE NON-
HAZARDOUS; FRANCAIS: “EXPLOSION DANGEREUSE
- NE PAS DÉBRANCHER L'ÉQUIPEMENT NI DÉPOSER LE
COUVERCLE SAUF SI L'ALIMENTATION A ÉTÉ COUPÉE OU SI
LA ZONE N'EST PAS DANGEREUSE.”
WARNiNg (FOR DiV. 2 ONLY):
THE EQUIPMENT MUST BE CONNECTED TO A CERTIFIED
CLASS 2 POWER SUPPLY; Francais: “L'équipement doit être
raccordé à une alimentation de classe 2 CERTIFIÉE”
Application Notes:
Entity parameters must meet the following requirements for both
CSA and ATEX/IECEx applications (except in areas where barriers
are not required, as noted below):
Ui
= 30 V, li
= 175 mA, Pi
= 1 W, Ci
= 0, Li
= 0
For Division 2 Applications (North America only):
Division 2 installations do NOT require the use of an intrinsically-
safe barrier or intrinsically-safe entity parameters.
Year of Construction:
This information is contained within the serial number with the first four
digits representing the year and month in the YYMM format.
NOtE 1:
if any of the following operations are performed in
the hazardous area, all appropriate hazardous area procedures
must be followed.
NOtE 2:
to prevent damage to electronic components caused
by electrostatic discharge, a grounding strap should be worn
when servicing the display.
Conduit installation instructions
1. Remove the printed circuit board from the enclosure.
2. Connect appropriate size conduit fittings to the hole provided.
For enclosures without a pre-drilled hole, the installer must
make a hole in accordance with the instructions for the particular
conduit fitting being installed.
3. Connect conduit (with attached hubs) to the enclosure.
Conduit hubs must be connected to the conduit prior to being
connected to the enclosure. Use only conduit hubs that are
designed to maintain NEMA 4 or IP67 ratings.
Note:
Please read PD685 Intrinsic Safety Control Drawing (LIM685-2) for more
information pertaining to the conduit holes.
Mounting instructions
1. Remove the enclosure cover from the base.
2. Insert mounting hardware into mounting holes in enclosure base
(see Figure 7).
3. Secure the enclosure base to the mounting surface using the
inserted hardware.
4. Re-attach the enclosure cover to the base.
sEtUP
The only tools needed for calibration are a calibrated current
source and a small slotted/flathead screwdriver.
All controls and wiring connectors are accessed by opening the
enclosure. To access electrical connectors, remove the enclosure
cover, unscrew the two captive screws that fasten the printed circuit
board, and remove the printed circuit board from the enclosure.
Calibration Connections
To access the input terminals it is necessary to remove the enclosure
cover and the printed circuit board. This is done by loosening the four
screws on the enclosure cover and removing the cover. Completely
loosen both thumb screws that hold the printed circuit board to the
enclosure. Turn it over to gain access to the reverse side. Then,
proceed to connect a calibrated current source per Figure 1.
Decimal Point selection
The decimal point jumper array J2 is located in the lower right corner
of the printed circuit board next to the display. It is labeled DDD.D,
DD.DD, and D.DDD. Place a jumper over both pins of DDD.D for a
display of 199.9, DD.DD for 19.99, or D.DDD for 1.999.
Calibration
LO and HI coarse and fine calibration controls are located below
the display (see Figure 2). The meter is factory calibrated to display
-500 at 4 mA and 1500 at 20 mA. Use the HI and LO COARSE
controls for large range changes during calibration and the HI and
LO FINE controls for precision changes. Apply a 4 mA signal and
adjust the LO controls to display the desired reading. Apply a signal
between 16 and 20 mA and adjust the HI controls to display the
desired reading. Complete the calibration procedure by making
minor adjustments to the LO and HI controls as necessary.
installation
Installation of the meter involves removing the printed circuit
board from its enclosure and connecting a ½" conduit fitting to the
hole provided. Refer to PD685 CSA, ATEX and IECEx Certified
Loop-Powered Meter Intrinsic Safety Control Drawing diagrams
(LIM685-2) for further details. Wall mounting holes are located in
each corner of the enclosure (see Figure 7).
Loop Connections
Disconnect power to the loop and wire the meter as illustrated
in (Figures 3 & 4) for 2-wire transmitter configuration, (Figures 5
& 6) for 4-wire transmitter configurations, and the PD685 CSA,
ATEX and IECEx Certified Loop-Powered Meter Intrinsic Safety
Control Drawing diagrams (LIM685-2) supplied with the instrument.
Connect the loop return wire to S- to disable the backlight feature
or connect it to B- to enable the backlight feature.
1. Read complete instructions prior to installation and operation of the meter.
2. Installation and service should be performed only by trained service personnel.
3. Substitution of components may impair hazardous location safety.
4. Service requiring replacement of internal components must be performed at the factory.
5. Equipment contains non-metallic materials and therefore special care and consideration should
be made to the performance of these materials with respect to chemicals which may be present
in a hazardous environment.
6. PD685 indicator does not add capacitance or inductance to the loop under normal or fault
conditions.
7. Hazardous location installation instructions for associated apparatus (barrier)
must be followed when installing this equipment.
8. For safe installation of an ATEX, IECEx, and/or CSA certified transmitter in
series with the PD685 loop indicator, the hazardous location installation instructions for the
transmitter, PD685 loop indicator, and associated apparatus (barrier) must be compatible.
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safety information
