Page 1
MODEL PD686 3½ DIGIT NEMA 4X
®
LOOP-POWERED METER
• 1 V Drop
• 1” High
D
isplay
• Operates
Down to
-40°C
SPECIFICATIONS
Except where noted all specifications apply to operation at +25°C.
Input: 4-20 mA @ 30 VDC maximum
DIspLay: 1.0" (25.4 mm) LCD, 3½ digits; 1999
aCCura
approv
with entity, for use in Class I, II, III, Division 1, Groups A, B, C, D,
E, F, & G; T-code = T4; hazardous locations. Non-incendive for use in
Class I, II, III, Division 2, Groups A, B, C, D, F, & G.
EntI
C
= 0 µF, Li = 0 µH, P
i
FM approvED: Intrinsically Safe, Class I Zone 0
See Control Drawing LIM686-2 for complete installation instructions.
DECIM
CaLI
CaLI
20 mA input: between 20 and 2000 counts > 4 mA display
DI
MaxIM
MaxIM
op
for Canadian installations -40 to 40°C.
st
rELa
EnCL
color: gray; impact-resistant clear polycarbonate cover; NEMA 4X,
IP67
ConnEC
ConD
Information to specify conduit hole location; request models with rear
conduit hole (-X) for panel mounting applications.
WEI
Warranty: 2 years parts & labor
ExtE
DIsCLaIMEr: The information contained in this document is
subject to change without notice. Precision Digital Corporation makes
no representations or warranties with respect to the contents hereof, and
specifically disclaims any implied warranties of merchantability or fitness for
a particular purpose.
Precision Digital corPoration
Cy: ±0.1% FS ±1 count
aLs: FM Approved & CSA Certified as intrinsically safe
ty paraMEtErs:
aL poInt: User selectable
bratIon: Two-step; non-interacting zero and span
bratIon rangE: 4 mA input: -1000 to +1000;
spLay upDatE ratE: 2.5/second
uM Input CurrEnt: 30 mA
uM voLtagE Drop: 1 V @ 20 mA
EratIng tEMpEraturE: PD686: -40 to 85°C
oragE tEMpEraturE: -40 to 85°C
tIvE HuMIDIty: 0 to 90% non-condensing
osurE: Impact-resistant glass filled polycarbonate body,
tIons: Removable screw terminals accept 12 to 26 AWG
uIt HoLE: One ½" conduit hole provided; refer to Ordering
gHt: 12 oz (340 g)
nDED Warranty: 1 or 2 years
= 1.3 W
i
V
max
= 30 V, I
max
= 175 mA,
ORDERING INFORMATION
Model Description
PD686* FM Approved & CSA Certied Bottom
PD686-X FM Approved & CSA Certied Rear
PD686-Y FM Approved & CSA Certied Top
PD686-Z FM Approved & CSA Certied None
* Quick Shipment Product, shipped within 2 working days
ACCESSORIES
Model Description
PDA6844 Panel Mount Kit (does not provide NEMA 4X seal to panel)
PDA6845 2˝ Pipe Mounting Kit (zinc plated steel)
PDA6845-SS 2˝ Pipe Mounting Kit (stainless steel)
SERVICES
Model Description
PDN-CAL Calibration with Certificate
PDN-
CALDATA Calibration with Certificate & Data
PDN-
EXTWRNTY1-0 Extended Warranty 1 Year
PDN-
EXTWRNTY2-0 Extended Warranty 2 Years
PDN-
LTCAL5 Lifetime Calibration with Annual Recertification
YOUR LOCAL DISTRIBUTO R IS :
½“ Conduit
Hole Location
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Page 2
SIDE VIEW
Wall
Mounting
Holes
Beneath
Cover
Screws
E
F
FRONT VIEW
D
A C
B
Figure 4
Dimensions and Wall Mounting Information
LO CALIBRATION CONTROL
HI CALIBRATION CONTROL
BALANCE CONTROL
(factory adjust only)
DISPLAY PCB COMPONENT SIDE
(may be removed for bench calibration)
S-
S-
S-
S+
S+
S+
BLACK
RED
LOOP JUMPER
CALIBRATED
CURRENT SOURCE
INPUT SIGNAL PCB
(mounted to base of enclosure)
+
-
DP1
DP2
DP3
Figure 1
Calibrator Connected to
Input Signal PCB
INPUT SIGNAL PCB
LOOP JUMPER
(remove when Display PCB is connected)
TRANSMITTER
HAZARDOUS AREA
NON-HAZARDOUS AREA
POWER
SUPPLY
+
+
-
-
4-20mA
S+ S+S- S-
Field wiring is
made to the
Input Signal PCB
which is mounted
to the base of
the enclosure.
Figure 2
Control loop Connected
to Input Signal PCB
S+ S-
DISPLAY PCB
COMPONENT SIDE
CALIBRATED
CURRENT SOURCE
DP1
DP2
DP3
Figure 3
The Display PCB may be removed from the enclosure
for bench calibration. Loop Jumper must be installed
on Input Signal PCB to maintain loop,
refer to procedures below.
Calibrator Connected to Display PCB
MODEL PD686 3½ DIGIT NEMA 4X LOOP-POWERED METER
Note: To maintain hazardous area protection, the input signal must always be connected to the Input Signal PCB, and not directly to the Display PCB.
Warning: Electrostatic hazard. Clean only with a moist cloth. Protect enclosure from exposure to chemical solvents and excessive ultraviolet (UV) light (e.g. sunlight).
Note 1: If any of the following operations are performed in the
hazardous area, all appropriate hazardous area procedures must
be followed.
2: to
Note
electrostatic discharge, a grounding strap should be worn when
servicing the display.
prevent damage to electronic components caused by
SETUP
The only tools needed for calibration are a calibrated current source and a
screwdriver.
Calibration Connections
To access the input terminals it is necessary to remove the enclosure cover and
the Display PCB. This is done by loosening the four screws on the enclosure
cover and removing the cover. Completely loosen the left screw that holds the
Display PCB to the enclosure and loosen the right screw about four turns so
the Display PCB remains attached to the enclosure. Rotate the Display PCB
90° to gain access to the Input Signal PCB. Next, connect a calibrated current
source per Figure 1.
Decimal Point Selection
The decimal point jumper array is located in the lower right corner of the
Display PCB next to the display. It is labeled DP1, DP2, DP3. Place a jumper
over both pins of DP1 for a display of 199.9, DP2 for 19.99, or DP3 for
1.999.
Calibration
LO and HI calibration controls are located to the left of the display
(see Figure 1). Apply a signal equal to 4 mA and adjust the LO control
to display the desired reading. Apply a signal between 16 and 20 mA and
adjust the HI control to display the desired reading. Complete the calibration
procedure by making any minor adjustments to the LO and HI controls.
Installation
Installation of the meter involves removing the Display PCB from its enclosure
and connecting a
FM Approved & CSA Certified Loop-Powered Meter Intrinsic Safety Barrier
Connections diagrams (LIM686-2) for further details. Wall mounting holes are
located in each corner of the enclosure (see Figure 4).
Loop Connections
Disconnect power to the loop and install the meter as illustrated in Figure
2 and the PD686 FM Approved & CSA Certified Loop-Powered Meter
Intrinsic Safety Barrier Connections diagrams (LIM686-2) supplied with the
instrument. Replace the enclosure cover.
Removing Display PCB From the Loop
The Display PCB and Input Signal PCB are connected together with one black
and one red wire. The wires are soldered to the Display PCB and connected to
a screw terminal connector on the Input Signal PCB.
To remove Display PCB:
1.
Loosen
the enclosure base.
Precision Digital corPoration
19 Strathmore Road • Natick MA • 01760 • USA • Tel: (800) 343-1001 • Fax: (508) 655-8990
1
/2″ conduit fitting to the hole provided. Refer to PD686
the four screws on the enclosure cover and remove the cover from
2. Completely loosen the left-side screw holding the Display PCB to the
enclosure and loosen the right-side screw four turns so the Display PCB
remains secure to the enclosure.
3. Rotate
the Display PCB 90° to gain access to the Input Signal PCB.
4. Install Loop Jumper over both pins to bypass Display PCB and allow the
signal to flow through the Loop Jumper. The display turns off when jumper
is installed.
5.
Disconnect the black and red signal wires from the screw terminal
connector.
6. Loosen completely the right-side screw and lift Display PCB from
enclosure. Care should be taken to prevent static electricity from damaging
the electronic circuitry.
7. Restore enclosure cover to the base to prevent contamination of
components.
Restoring Display PCB to the Loop
1. Remove enclosure cover as described above in step 1.
2. Secure Display PCB to enclosure using right-side screw; do not tighten
screw to allow rotation of Display PCB while accessing Input Signal PCB.
3. Connect red wire to S+ terminal and black wire to S- terminal, as shown in
Figure 1.
4. Remove Loop Jumper to allow the signal to flow through Display PCB
(save push-on jumper by placing over one pin only).
5. Tighten screws holding Display PCB and install enclosure cover.
Servicing Display PCB Outside the Loop
Two modes of input signal allow the user to remove the Display PCB for
service without interrupting the loop as indicated above and operate the
Display PCB at another location in a non-hazardous area. The loop remains
connected to the Input Signal PCB while the Display PCB is absent for service.
The user may operate the Display PCB at another location by connecting a
signal to “S+” and “S-” wires on the Display PCB. Refer to Figure 3.
A: 3.15″ (80 mm) C: 2.36″ (60 mm) E: 2.56″ (65 mm)
B: 5.51″ (140 mm) D: 4.72″ (120 mm) F: 0.79″ (20 mm)
LIM686 Rev D 01/07
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PRECISION DIGITAL CORPORATION
19 Strathmore Road • Natick MA • 01760 • USA • Tel: (800) 343-1001 • Fax: (508) 655-8990
SECTION AGENCY DESCRIPTION
1.0 General Notes
2.0 FM/CSA Conduit Installation Instructions
3.0 FM Single or Dual Channel Positive Polarity
Intrinsic Safety Barrier
4.0 CSA Single or Dual Channel Instrinsic Safety
Barrier Entity Installation
NOTE: FM AND CSA CONTROLLED DOCUMENT.
NO CHANGES WITHOUT PRIOR FM AND CSA APPROVAL.
1.0 GENERAL NOTES
1.1 For Class II, Class III (Division 1 and 2) and NEMA/CSA
type 4X installations, use conduit hub which is listed/certified
for the environment in which the indicator is installed.
1.2 For Class II and III (Division 1 and 2) installations, field wiring
must enter the enclosure through a listed/certified dust-tight
conduit seal.
1.3 Control room equipment must not use or generate more than
250 VRMS or VDC.
1.4 US installations must be in accordance with ANSI/ISA
RP12.06.01 "Installation of Intrinsically Safe Systems for
Hazardous (Classified) Locations” and the National Electrical
Code (ANSI/NFPA 70). Canadian installations must be in
accordance with the Canadian Electrical Code, Part 1.
1.5 Hazardous location installation instructions for associated
apparatus (barrier) must also be followed when installing this
equipment.
1.6 For safe installation of a FM Approved/CSA Certified
transmitter in series with PD686 loop indicator, the hazardous
location installation instructions for the transmitter, PD686 loop
indicator, and associated apparatus (barrier) must be
compatible.
1.7 PD686 indicator does not add capacitance or inductance to loop
under normal or fault conditions.
1.8
Substitution of components may impair hazardous location
safety.
2.0 PD686 CONDUIT INSTALLATION INSTRUCTIONS
2.1 Remove the Display from the enclosure and connect ½" 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.
2.2 Use only UL/CSA conduit hubs that are specified to maintain
NEMA 4X and Class II / Class III ratings.
2.3 Conduit hubs must be connected to the conduit prior to being
connected to the enclosure.
2.4 Enclosure must be mounted using the mounting holes located in
the base external to the equipment cavity.
3.0 PD686 FM INSTALLATION WIRING DIAGRAM
Using single or dual channel intrinsic safety barrier
Application Notes:
3.1 U
i
> Uo of single channel barrier or Vt
of dual channel
barrier
3.2 Ii
> Io of single channel barrier or It of dual channel barrier
3.3 Li plus interconnecting wiring < Lo of single or dual channel
barrier
3.4 Ci plus interconnecting wiring < Co of single or dual channel
barrier
3.5 It is not necessary to use intrinsic safety barriers when installing
the PD686 in Class I,II,III, Division 2, Groups ABCDFG,
maximum input voltage = 30 VDC.
4.0 PD686-CSA INSTALLATION WIRING DIAGRAM
Using single or dual channel intrinsic safety
barrier-entity installation
Application Notes:
4.1 Barrier parameters must meet the following requirements:
Voc or Uo ≤ V
max
or U
i
Isc or Io ≤ I
max
or I
i
Ca or C
o
≥
C
i
+ C
cable
La or Lo ≥ L
i
+
L
cable
Po < P
i
4.2 For CSA Certification, barrier and transmitter must be CSA
Certified with Entity Parameters and must be connected per
manufacturer’s instructions.
4.3 It is not necessary to use intrinsic safety barriers when installing
the PD686-CSA in Class I,II,III, Division 2, Groups ABCDFG,
maximum input voltage = 30 VDC.
PD686 FM APPROVED & CSA CERTIFIED LOOP-POWERED METER
Intrinsic Safety Barrier Connections
S-
S+
+
-
FM Entity Approved
positive polarity single
or dual-channel intrinsic
safety barrier used in an
approved configuration.
<1 ohm to Ground
Class I, Div 1, 2, Groups ABCD
Class II, Div 1, Groups EFG
Class II, Div 2, Groups FG
Class III,
Div 1, 2
Class 1,
Zone 0,
Group IIC
HAZARDOUS AREA NON-HAZARDOUS AREA
FM ENTITY APPROVED TRANSMITTER INSTALLED PER TRANSMITTER
MANUFACTURER'S HAZARDOUS LOCATION INSTALLATION DRAWING
PD686 ENTITY PARAMETERS:
U
i
: 30 V;
Ii : 175 mA; C
i
: 0; L
i
: 0; P
i
: 1.3 W
I.S.GROUND
PD686
S-
S+
+
-
CSA Entity Certified
positive polarity single
or dual-channel intrinsic
safety barrier used in an
approved configuration.
<1 ohm to Ground
Class I, Div 1, 2, Groups ABCD
Class II, Div 1, Groups EFG
Class II, Div 2, Groups FG
Class III,
Div 1, 2
HAZARDOUS AREA NON-HAZARDOUS AREA
CSA ENTITY CERTIFIED TRANSMITTER INSTALLED PER TRANSMITTER
MANUFACTURER'S HAZARDOUS LOCATION INSTALLATION DRAWING
PD686-CSA ENTITY PARAMETERS:
V
max
: 30 V;
I
max
: 175 mA; C
i
: 0; L
i
: 0; P
i
: 1.3 W
I.S.GROUND
PD686-CSA
Conduit Hole
LONG SIDE VIEW
2.755″ (70 mm)
.790″
(20 mm)
.750″
(19 mm)
2.56″
(65 mm)
TYPICAL HOLE LOCATION
LIM686-2 Rev C 02/04
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1155 Rev K
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