Product Type: IP67 Loop-Powered Meter
Input: Current (4-20 mA)
Approvals: CE, ATEX (IS), IEC (IS)
Display Category: LCD, Single Line, Sunlight Readable, Large Display
Display: 28 mm (1.1″) High, 3 1/2 Digits LCD
Warranty: 2 years
Conduit Hole Location: Bottom
Product Family: PD685
Product category: Loop Powered Meters, Field Mounted Indicators, Intrinsically Safe
Product Application: Level, Pressure, Process, Hazardous Area
Precision Digital PD685Last Updated: 08/12/2018
Usually ships in 2 to 4 weeks
The PD685 is an ATEX and IECEx intrinsically safe, IP67 loop-powered indicator that is easy to install and program. It can be seen from considerable distance in bright sun 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°C to +75°C operating temperature range and is available with a 22 mm (0.865″) 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.
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
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
|II 1 GD|
|Ex ia IIC T4 Ga|
|Ex ia IIIC T135°C Da|
|-40°C ≤ Ta ≤ +75°C; IP67|
Special Conditions for Safe Use:
- The permitted ambient temperature range for the PD685 is -40°C to +75°C (-40°F to 167°F).
- Use suitably certified and dimensioned cable entry device and/or plug. The equipment shall be installed such that the supply cable is protected from mechanical damage. The cable shall not be subjected to tension or torque.
- Under certain extreme circumstances, the non-metallic parts incorporated in the enclosure of this equipment may generate an ignition-capable level of electrostatic charge. Therefore, the equipment shall not be installed in a location where the external conditions are conducive to the build-up of electrostatic charge on such surfaces. This is particularly important if the equipment is installed in a zone 0 location. In addition, the equipment shall only be cleaned with a damp cloth.
- The cable entry into the enclosure shall be by means of conduit or cable gland and shall provide a minimum degree of protection of IP5X.
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.
For European Community: The PD685 must be installed in accordance with the Essential Health & Safety Requirements of Directive 2014/34/EU, the product certificates CML 17ATEX2113X and IECEx CML 17.0052X, and the product manual. 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.
Two-Wire Transmitter Input
Four-Wire Transmitter Input
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.
Instruction Manual:LIM685_1 Instruction Manuals