Precision Digital Logo

PD685 Intrinsically Safe IP67 Loop-Powered Meter

PD685 Instruction Manual
Canadian Standards Association Atmosphères ExplosiblesEuropean Conformity

The PD685 is an easy to use, loop-powered indicator, certified by CSA, ATEX and IECEx as intrinsically safe. The PD685 carries international certifications under both the Class/Division System and Zone System, and is thereby suitable for use in gas and dust hazardous areas worldwide. For Division 2 applications where intrinsically safe interfaces are not needed, the PD685 is able to be installed without barriers! To achieve this ability, the PD685 underwent a special 'nonarcing assessment' under the UL 121201 and CSA C22.2 No. 213 standards, and was determined to be a device incapable of causing an ignition on its own. The PD685 is wellsuited for both indoor and outdoor applications and carries a variety of environmental ratings, including NEMA 4, Type 4X and IP67.

The PD685 can be seen from considerable distance in bright sunlight or dimly lit areas when the standard backlight feature is activated. The fact that this meter is loop-powered means that there is no need to run additional, costly power lines into a hazardous area. The meter gets all of the power it needs from the 4-20 mA loop and its 1 V (4 V with backlight) drop results in a minimal burden on the loop. The meter features a wide -40 to 75°C operating temperature range and is available with a ½" conduit hole in a location of your choice for easy installation. Calibration is a quick two-step process involving the adjustment of only two sets of coarse and fine, non-interacting potentiometers.

Features

  • NEMA 4, IP67 Loop-Powered Field-Mount Process Meter
  • 4-20 mA Input
  • 1.1" (28 mm) 3½ Digits LCD Display; -1999 to 1999
  • 1 V Drop (4 V Drop with Backlight)
  • HART® Protocol Transparent
  • Loop-Powered Backlight Standard
  • Operates from -40 to 75°C (-40 to 167°F)
  • Coarse and Fine Zero & Span Potentiometer Adjustments for Easy Field Scaling
  • Plastic NEMA 4, IP67 Enclosure
  • CSA, ATEX and IECEx Certified as Intrinsically Safe
  • Certified Under Both Class/Division and Zone Systems
  • Certified for Location in Div 2 Areas without IS Barriers
  • CE Marked
  • Conformal Coated PCBs for Dust and Humidity Protection
  • One ½" Conduit Hole (Rear, Top, Bottom or None)
  • Pipe & Panel Mounting Kits
  • Stainless Steel Tag Available
Untitled Document

General

Except where noted all specifications apply to operation at +25°C.
Input: 4-20 mA @ 30 VDC maximum
Display: 28 mm (1.1") LCD, 3½ digits; -1999 to +1999
Backlight: Powered by 4-20 mA loop. Intensity varies with signal level
Accuracy: ±0.1% FS ±1 count
Approvals:

ATEX and IECEx:
Certified as intrinsically safe with entity, for use in Equipment Group II, categories 1G (for Gas) and 1D (for Dust), suitable for Zone 0, 1 & 2 (for Gas) and Zone 20, 21 & 22 (for Dust) classified areas, and carrying the following markings:
     II 1 GD. Ex ia IIC T4 Ga. Ex ia IIIC T135°C Da. -40°C ≤ Ta ≤ +75°C.
CSA:
Certified as intrinsically safe with entity, to U.S. and Canadian standards for Divisions and Zones (Gas and Dust), and carrying the following markings:
     Ex ia IIC T4 Ga; Ex ia IIIC T135°C Da; (Canada only)
     Class I, Zone 0, AEx ia IIC T4 Ga; Zone 20, AEx ia IIIC
     T135°C Da; (U.S. only)
     Class I, Division 1, Groups A, B, C and D, T4;
     Class II, Division 1, Groups E, F and G, T135°C;
     Class III; Type 4X; IP67;
     -40°C ≤ Ta ≤ 75°C
Certified as suitable for Division 2 without barriers, to U.S. and Canadian Standards, and carrying the following markings:
     Class I, Division 2, Groups A, B, C and D, T6;
     Class II, Division 2, Groups F and G, T85°C;
     Class III; Type 4X; IP67;
     -40°C ≤ Ta ≤ 75°C

Entity Parameters: Ui = 30 V, Ii = 175 mA, Pi = 1 W, Ci = 0, Li = 0
Decimal Point: User selectable via J2 jumper
Calibration: Four-step coarse and fine control; 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
Input Overload Protection: Over voltage protection to 30 V max (between S+ and S-)
Maximum Voltage Drop: 1 V @ 20 mA (4 V @ 20 mA with backlight)
Operating Temperature: -40°C to +75°C
Storage Temperature: -40°C to +85°C
Relative Humidity: 0 to 90% non-condensing. Printed circuit boards are conformally coated.
Enclosure: Impact-resistant, glass-filled, polycarbonate body, opaque; Impact-resistant, polycarbonate cover, transparent; Polyurethane/polymer gasket; Polyamide/plastic cover screws; NEMA 4X, IP67
Connections: Removable screw terminal block, 12 to 24 AWG.
Conduit Hole: One 22 mm (0.865") conduit hole may be provided; refer to Ordering Information to specify conduit size and hole location; request model (-Z) for no conduit hole.
Weight: 340 g (12 oz)
Warranty: 2 years parts & labor

Compliance Information

Product Markings:

The PD685 will carry the following ATEX and IECEx markings:
0518     II 1 GD
Ex ia IIC T4 Ga
Ex ia IIIC T135°C Da
-40°C ≤ Ta ≤ +75°C; IP67
The PD685 will carry the following CSA markings:
-40°C ≤ Ta ≤ +75°C
Ex ia IIC T4 Ga;
Ex ia IIIC T135°C Da;
Class I, Zone 0, AEx ia IIC T4 Ga;
Class I, Zone 20, AEx ia IIIC T135°C Da;
Class I, Division 1, Groups A, B, C and D, T4;
Class II, Division 1, Groups E, F and G, T135°C; Class III;
Class I, Division 2, Groups A, B, C and D, T6;
Class II, Division 2, Groups F and G, T85°C; Class III;
Type 4X; IP67

Connections


Caution:
Figures 1-6 are intended to serve as simplified wiring diagrams for typical applications. For hazardous area applications, the PD685 must be installed per the PD685 Intrinsic Safety Control Drawing (LIM685-2).
Figure 1: Calibrator Connection
Figure 2: Calibration Controls Location

Two-Wire Transmitter Input

Figure 3: Control Loop Connections (2-Wire)
Figure 4: Control Loop Connections with Backlight (2-Wire)

Four-Wire Transmitter Input

Figure 5: Control Loop Connections (4-Wire)
Figure 6: Control Loop Connections with Backlight (4-Wire)

Dimensions and Wall Mounting


A: 80 mm (3.15")C: 62 mm (2.44")E: 70 mm (2.75")
B: 130 mm (5.12")D: 112 mm (4.41")F: 20 mm (0.79")

Pipe Mounting Kit

The PDA6845 is a pipe mounting kit with two mounting holes. It provides all of the necessary hardware to mount the PD685 to a 2" pipe. It is available in zinc plated and stainless steel materials.

Panel Mounting Kit

The PDA6854 is a panel mounting kit for the PD685. It provides all of the necessary hardware to mount the PD685 meter to an equipment panel. This panel mounting kit is not intended to provide waterproof protection to the panel.

loader.gif

Choose Your Options

Configurations other than those specified above are available at a $250 adder. Consult factory for desired model number and price.

Why you should buy: