Features
- 4-20 mA Input
- NEMA 4X
- 1 V Drop
- 3½ Digit LCD 1" (25.4 mm) High
- Operating Temperature Range: -40 to 85°C
- ½ Conduit Hole Provided
- Intrinsically Safe with Entity
Class I, II, III; Div. 1; Gp A, B, C, D, E, F, G
- Non-incendive:
Class I, II, III; Div2; Gp A, B, C, D, F, G
The PD686 can be installed just about anywhere in North America: indoors, outdoors, hot, cold, safe or hazardous area. It has been approved by FM and CSA as instrinsically safe and non-incendive, will operate from –40 to 85°C, and adds only 1V to the loop. Its big 1 inch high display means it can be read from considerable distance. Calibration is a quick two-step process involving the adjustment of only two non-interacting potentiometers.
Note: For complete installation information see instruction manuals below
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Setup
The only tools needed for calibration are a calibrated
current source and a screwdriver.
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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 to the right.
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.
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Figure 1: Calibrator Connected
to Input Signal PCB |
Installation
Installation of the meter involves removing the Display
PCB from its enclosure and connecting a 1/2" conduit
fitting to the hole provided. Refer to PD686 FM Approved
& CSA Certified Loop-Powered Meter Intrinsic Safety
Barrier Connections Diagrams for further details. Wall
mounting holes are located in each corner of the enclosure
(Figure 1 shown above).
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Loop Connections
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Figure 2: Control loop Connected to Input Signal PCB
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Disconnect power to the loop and install the meter as
illustrated in Figure 2 (shown on the left) and the PD686
FM Approved & CSA Certified Loop-Powered Meter Intrinsic
Safety Barrier Connections Diagrams that are supplied
with the instrument. Replace the enclosure cover.
Field wiring is made to the Input Signal PCV which is
mounted to the base of the enclosure
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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 to the right.
The Display PCB may be removed from the enclosure for
bench calibration. Loop Jumper must be installed on Input
Signal PCB to maintain loop.
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Figure 3: Calibrator Connected to Display PCB
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Dimensions and Wall Mounting Information
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| 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) |
Figure 4
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Specifications
General
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
Accuracy: ±0.1% FS ±1 count
Approvals: FM Approved & CSA Certified as intrinsically
safe 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.
Entity Parameters: Vmax= 30 V, Imax
= 175 mA, Ci= 0 µF, Li = 0 µH,
Pi = 1.3 W
FM Approved: Intrinsically Safe, Class I Zone 0
See Control Drawing LIM686-2
for complete installation instructions.
Decimal Point: User selectable
Calibration: Two-step; non-interacting zero and span
Calibration Range: 4 mA input: -1000 to +1000;
20 mA input: between 20 and 2000 counts > 4 mA display
Display Update Rate: 2.5/second
Maximum Input Current: 30 mA
Maximum Voltage Drop: 1 V @ 20 mA
Operating Temperature: PD686: -40 to 85°C
for Canadian installations -40 to 40°C.
Storage Temperature: -40 to 85°C
Relative Humidity: 0 to 90% non-condensing
Enclosure: Impact-resistant glass filled polycarbonate body, color: gray; impact-resistant clear polycarbonate cover; NEMA 4X, IP67
Connections: Removable screw terminals accept 12 to 26 AWG
Conduit Hole: One ½" conduit hole provided;
refer to Ordering Information to specify conduit hole
location; request models with rear conduit hole (-X) for
panel mounting applications.
Weight: 12 oz (340 g)
Warranty: 2 years parts & labor
Extended Warranty: 1 or 2 years
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.
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Ordering
Information
| Product
Information |
| Model |
Description |
½" Hole Location |
Price |
| PD686* |
FM Approved &
CSA Certified |
Bottom |
$309 |
| PD686-X |
FM Approved & CSA Certified |
Rear |
$309 |
| PD686-Y |
FM Approved & CSA Certified |
Top |
$309 |
| PD686-Z |
FM Approved & CSA Certified |
None |
$309 |
| *QSP product (click
here for details) |
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| Accessories |
| Model |
Description |
Price |
| PDA6844 |
Panel Mount Kit (does not provide
NEMA 4X seal to panel) |
$49 |
| PDA6845 |
Pipe Mounting Kit (zinc plated steel) |
$49 |
| PDA6845-SS |
2" Pipe Mounting Kit (stainless
steel) |
$79 |
| PDA-SSTAG |
Stainless Steel Tag |
$25 |
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| Services |
| Model |
Description |
Price |
| PDN-CAL |
Calibration with Certificate |
$50 |
| PDN-CALDATA |
Calibration with Certificate &
Data |
$75 |
| PDN-EXTWRNTY1-0 |
Extended Warranty 1 Year Based on List
Price $0-299 |
$35 |
| PDN-EXTWRNTY2-0 |
Extended Warranty 2 Years Based on List
Price $0-299 |
$50 |
| PDN-LTCAL5 |
Lifetime Calibration with Annual Recert
(shipped back within 5 days) |
$250 |
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