Explosion-Proof Large Display Loop-Powered Indicator


The Tek-LCD 7805B is an explosion-proof, loop-powered process Indicator with 1″ display digits in a field-mountable enclosure designed for demanding applications in hazardous areas or in the harshest environmental conditions. The meter derives all of its power from the 4-20 mA loop with a small 1 V drop so there is no need to run additional, costly power lines into a hazardous area. The Tek-LCD 7805B loop-powered indicator carries FM, CSA, ATEX, and IECEx approvals for use in hazardous areas. It is programmed using four easy-to-access, front-mounted control dials.

  • 4-20 mA input
  • Modern, sleek and practical enclosure for safe areas
  • 3½ digits, 1″ (0.08 ft) display
  • Display mountable at 0°, 90°, 180°, and 270°
  • Easy calibration and installation
  • Loop-powered backlight option
  • 1 V drop (4 V with backlight)
  • Explosion-Proof, IP68, NEMA 4X Enclosure
  • Flanges for wall or pipe mounting
  • HART protocol transparent
  • Operates from -40 °F to 167 °F (-40 °C to 75 °C)
Input range4-20 mA
Display update rate2.5 Updates/Second
Display orientationMounted at 90° increments up to 270° from default orientation
Voltage range9-36 VDC
Over rangeDisplay reads 1 on the left most digit
RecalibrationRecommended at least every 12 months
Programming methodFour front mounted rotary control dials accessed when the cover is removed
Normal mode rejection 60 dB rejection ratio
Operating temperature range-40 °F to 167 °F (-40 °C to 75 °C)
Storage temperature range -40 °F to 167 °F (-40 °C to 75 °C)
Relative humidity0 to 90% non-condensing
ConnectionsScrew terminals accept 12 to 22 AWG wire
Accuracy±0.1% of full span ±1 count
Temperature drift150 PPM/°F from -40 °F to 167 °F (-40 °C to 75 °C) ambient
 Calibration range4 mA input: -1000 to +1000; 20 mA between 20 and 2000 counts greater than 4 mA display. Two point linear display span
 HART transparencyAnalog input will not interfere with existing HART communications on the wired 4-20 mA signal
 EnclosureExplosion-proof die cast aluminum with glass window, 0.30% max copper content, corrosion resistant epoxy coating, color: blue. NEMA 4X, IP68. Two ¾” NPT threaded conduit openings. One ¾” NPT nickel plated brass conduit plug with 0.03 ft hex key ftting installed.
 MountingMounted directly to conduit. Two slotted anges for wall mounting or NPS 1½” to 2½” or DN 0.13 ft to 0.21 ft pipe mounting
 Weight5.00 lbs (80 oz, 2.27 kg)
Dimensions5.65″ x 5.25″ x 4.86″ (0.47 ft x 0.43 ft x 0.40 ft) (W x H x D)
Maximum voltage drop1 VDC @ 20 mA without backlight; 4 VDC @ 20 mA with loop-powered backlight.
Input overloadOver current protection to 2 A max

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