Electro-Chemical Devices (ECD) R350D - Manual (Page 7)

Model R350D Page 1
1.0 GENERAL DESCRIPTION
The R350D 3 1/2 digit liquid crystal display (LCD) is
calibrated to directly read any process variable
between of -1999 and +1999. The display is loop
powered by any 4 to 20 milliamp loop and
responds to the current being driven through the
loop. The display is housed in a windowed,
corrosion resistant, weatherproof enclosure
(rated NEMA 4x). The reflective LCD does not
wash out, or fade in intense direct light. As the
incident light is increased, the display becomes sharper with greater visibility, making it an ideal
indicating device for outdoor installations.
Access to the wiring is made available through a 1/2-inch conduit knockout in the bottom of the
enclosure. The wiring information is located on the PCB. Mounting hardware is available for wall, pipe
or panel as standard factory installed options. For convenience during installation, the complete
electronic assembly lifts out of the enclosure via the keyed hinging arrangement leaving only the
essentials for mechanical installation.
Although the circuit board has a conformal coating to endure highly corrosive and humid environments,
the wiring port must be sealed to protect the display surface itself. The screws that hold the cover on
the enclosure are captive to the cover, preventing misplacement or loss of small hardware during
routine maintenance.
1.1 Features
• 12.7 mm (0.5") Digit Height
• 4-20mA Loop Powered Indication
• Low Volt Drop
• Programmable Decimal Points
• LED Backlighting (30mA @ 5V typ.)
• Band gap Reference
• Wide Adjustment Range
• Auto-polarity on Display
• IP67 / NEMA 4X Protection via BEZ 700-IP
1.2 Electrical Specifications
Specification Minimum Typical Maximum Unit
Accuracy* 0.05 0.1 % (±1 count)
Linearity ±1 Count