Features
- 4-20 mA Input
- NEMA 4X
- 1 V Drop
- 3½ Digit LCD 1" (25.4 mm) High
- Operating Temperature Range: -40 to 80°C
- ¾" NPT Hole Provided
The PD687 can be installed just about anywhere
in North America except Group A locations: indoors,
outdoors, hot, cold, safe or hazardous area. The
PD687-EX is FM Approved and CSA Certified as explosion-proof,
will operate from –40 to 80°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 manual linked below
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Setup
The only tools needed for calibration are a calibrated current source and a screwdriver.
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Figure 1: Assembly |
Decimal Point Selection
The decimal point jumper array is located in the lower
right corner of the Display Board 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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Servicing
Display PCB Outside the Loop
Two modes of input signal connections allow the user to remove the Display Board for service and maintain the loop connection. This is done by connecting the LOOP JUMPER (see Figure 2) over both pins of the header on the Input Signal Board. The user may now operate the Display Board at another location by connecting a signal directly to the “S+ and S-” wires on the Display Board. When the display of the instrument is put back in service the push-on LOOP JUMPER must be removed from both pins, save the jumper by placing over one pin only.
Field wiring is made to the Input Signal Board which is
mounted to the base of the enclosure. |
Figure 2: Control Loop Connected To Input Signal Board
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Dimensions and Mounting Information
Refer to Figure 3 for location of mounting holes located in each corner of the enclosure. Mount the enclosure as desired and connect the conduit to the ¾" NPT hole provided and install sealing fittings
The user may mount the Display so conduit hole is oriented vertically or horizontally
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| A: 6.34" (161 mm) | C: 1.5" (38 mm) | E: 5.13" (130 mm) |
| B: 5.13" (130 mm) | D: 6.25" (159 mm) |
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Figure 3
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Specifications
General
Except where noted all specifications apply to operation at +25°C.
Input: 4-20 mA @ 24 VDC maximum
Display: 1.0" (25.4 mm) LCD, 3½ digits;
1999
Accuracy: ±0.1% FS ±1 count
Approvals: The PD687-EX is FM Approved & CSA
Certified as explosion-proof for Class I, Division 1,
Groups B, C, & D; dust-ignition proof for Class II,
Division 1, Groups E, F, & G; and Class III hazardous
(Classified) locations.
Enclosure: Explosion-proof cast aluminum with glass
window, 0.3% max copper content, NEMA 4, 7, & 9, IP66;
suitable for location in Class I, Division 1, Groups B,
C, & D, Class II, Groups E, F, & G, Class III
hazardous outdoor (Type 4) locations. One ¾"
NPT hole provided.
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: -40 to 80°C
Storage Temperature: -40 to 80°C
Relative Humidity: 0 to 90% non-condensing
Connections: Removable screw terminals accept 12
to 26 AWG
Conduit Hole: One ¾" NPT hole provided
Weight: 7.5 lb (3.4 kg)
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 |
Price |
| PD687 |
Loop-Powered Explosion-Proof
Meter |
$569 |
| PD687-EX |
FM Approved & CSA Certified
Loop-Powered Meter |
$679 |
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| Accessories |
| Model |
Description |
Price |
| 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 |
2-Point Calibration |
$50 |
| PDN-CALDATA |
Calibration with Certificate |
$75 |
| PDN-EXTWRNTY1-1 |
Extended Warranty 1 Year Based on List Price:$300-$599 |
$50 |
| PDN-EXTWRNTY2-1 |
Extended Warranty 2 Years Based on List Price:$300-$599 |
$75 |
| PDN-EXTWRNTY1-2 |
Extended Warranty 1 Year Based on List Price:$600-$1299 |
$70 |
| PDN-EXTWRNTY2-2 |
Extended Warranty 2 Years Based on List Price:$600-$1299 |
$105 |
| PDN-LTCAL5 |
Lifetime Calibration with Annual Recert (shiiped
back within 5 days) |
$250 |
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