Loop-powered indicator DT420 E

process4-digitLCD display

Product features

• Display in engineering units
• 4-20 mA loop-powered
• 3 1/2 digit LCD display
• 15.2 mm character height
• Easy on site configuration
• IP65 (front) and IP30 (rear) protection

Product descriptions
The DT420 E Process indicators enable linear process variables to be displayed in engineering units on the control
panel. The unit is loop-powered from 4-20 mA signals, dropping less than 2 V at 20 mA.
The process indicators housed in a DIN standard 96 × 45 mm ABS case with IP 65 protection from the front and IP 30 protection from the back side. Large 3 ½ digit 15 mm character height liquid crystal display make process variables easily visible at a distance.
A label defining the appropriate engineering unit is attached to the right of the display. The unit can be set up to reverse the display „direction” (i.e. to produce a decreasing displayed value for a rising signal input) and to display a decimal point if required.
Easy on-site configuration through the front panel keypad is a major advantage of the microcontroller-based technology.
The settings of zero and end-values are non-interactive, making the configuration process rapid and simple.
The configuration parameters: scaling, decimal point position, display refresh-rate, signal filtering, etc. are stored in EEPROM.
A two level password protects the settings from unauthorised changes.

Technical specification
Safety data: The connection terminals of the supply voltages are isolated from each other, the isolation is in compliance with EN 61010-1, pollution level: 2, measurement category: II
Input parameters:

• Input signal: DC current
• Characteristics: linear
• Measurement range: 4-20 mA
• Overrange: 3.5-20.5 mA
• Sampling rate: 15 measurement / sec.
• Number of averaged samples: 1 / 2 / 4 / 8 / 16 / 32 (selectable)
• Drop: < 2 V @ I=20 mA (DT4200) < 2.5 V @ I=20 mA (DT420 E)
• Accuracy: 0.01% @ Ta = 23 °C ±2 °C (DT4200), 0.02% @ Ta = 23 °C ±2 °C (DT420 E)
• Temperature-coefficient: ±20 ppm / °C

Display:

• Display: 4 1/2 digit, 7 segments, decimal point and negative sign (DT4200), 3 1/2 digit, 7 segments, decimal point and negative sign (DT420 E)
• Display unit: LCD, 15.2 mm character height
• Display value assigned to 4 mA: anywhere within the range
• Display value assigned to 20 mA: anywhere within the range
• Decimal point: its position can be selected, or it can be switched off
• Display refreshing time: 0.1; 0.3; 0.5; 1.0; 2.0 sec. (selectable)

Manual controls:

• Manual controls: 3 membrane push-buttons on the front cover

Output parameters (DT4200):

• Output: 2 limit outputs
• Output type: optically isolated passive switching transistor
• Leakage current: I < 0.1 mA @ 9 V
• Drop: U < 1 V @ 10 mA
• Load reating: 30 V, 30 mA max.
• Refreshing time: same as the display refreshing time
• Hysteresis: 0 - ±999

Power supply:

• Power supply: 4-20 mA loop-powered, reverse polarity protected

Ambient conditions:

• Operating temperature range: 0 - +60 °C (-20 - +60 °C for customer request)
• Relative humidity: 90% (max., non-condensing)
• Place of installation: cabinet, control panel

Electromagnetic compatibility (EMC) accordance with the standard EN 61326:

• Immunity: industrial area
• Noise emission: Group 1, Class B

General data:

• Housing: panel instrument
• Connection: push-in direct connection
• Connection cable: 0.25-1.5 mm2 (max.)
• Dimensions / weight: 96 × 48 × 39 mm (width × height × depth) / 0.1 kg
• Protection: IP 65 (front), IP 30 (rear)

Detailed information see in operating instructions. The Manufacturer maintans the right to change the technical data!