Explosion-Proof Modbus Scanner
TEK-LCD 7804B SERIES EXPLOSION-PROOF MODBUS SCANNER
The Tek-LCD 7804B is an explosion-proof, RS485 serial input Modbus® RTU scanner capable of scanning up to 16 Modbus variables and displaying them on an easy-to-read, dual-line, LCD display. This Modbus scanner can be programmed as a Modbus RTU master, slave, or snooper. The Tek-LCD 7804B is available in two upper display line configurations: 5-digit decimal display and feet & inches display with a bar graph. The lower line is the same for both versions and consists of seven alphanumeric characters. The Tek-LCD 7804B carries FM, CSA, ATEX, and IECEx approvals for use in hazardous areas. Two features that really make the Tek-LCD 7804B stand out are its wide viewing angle display and SafeTouch® through-glass buttons. These buttons allow the Tek-LCD 7804B to be programmed and operated through the glass, thus eliminating the need to remove the cover in a hazardous area.
Features
Specifications
Documents
Drawings
Features
- Modbus® Master, Slave, or Snooper Mode
- Scan up to 16 Modbus Process Variables
- 5-Digit Decimal or Feet & Inches Level Display
- On-Board Three-Wire RS-485 with Modbus
- Independent Scaling, Tag, and Unit for Each PV
- 7 Alphanumeric Character 0.4″ (10.2 mm) Lower Display for Process Variables, Custom Units, and Tags
- Explosion-Proof, IP68, NEMA 4X Enclosure
- Isolated 4-20 mA Output Option
- Pulse Input for Rate, Total, and Grand Total
- 13-Digit Totalizer with Total Overflow Feature
- Password Protection
- Two Isolated Pulse Outputs Standard, Up to 5 kHz
- Operates from -40 °C to 75 °C
Specifications
| Decimal Display | Top:Top Display: Five Digits (0 to 99999), 0.7″ (17.8 mm) high, 7-segment, automatic lead zero blanking. Bottom Display: Seven Characters, 0.4″ (10.2 mm) high, 14-segment, automatic lead zero blanking. |
| Feet & Inches Display | Top Display: 0.60″ (15.2 mm) high, 0 to 399FT, 1115/16 IN, 7-segment, programmable 1/16 or 1/8 fraction display. Bottom Display: Seven Characters, 0.4″ (10.2 mm) high, 14-segment, 7-digits. |
| Display Assignment | Top and Bottom Display*: Process Variables (PV); Alternating PV and Units, Tag and PV, or Tag, PV, and Units; Pulse Input Rate, Total, or Grand Total with Alternating Tag. Bottom Display: All Top Display Options or Off |
| Backlight | White LED, 10 sec auto-off when battery powered. Backlight deactivated below temperature ≈ -20°C |
| Alarm Indication | Flashing display plus HI/LO (alarm) or SET indicators. |
| Scan and Update Rate | Ambient > -20°C: Modbus PV scan rate programmable from 2 to 99 seconds per PV. Tag and units programmable for 1 to 5 second alternation. Pulse input variables update 1/second. Rate update is dependent on gate settings. Ambient < -20°C: All Modbus scan, alternating units and tags, and pulse input variables update/10 seconds minimum. |
| Under Range | Upper Display: Decimal display flashes -9999 Level display flashes to 399FT 1115/16 IN Lower Display: Flashes -999999 |
| Over Range | Upper Display: Decimal display flashes 99999 Level display flashes to 399FT 1115/16 IN Lower Display: Flashes 9999999 |
| Programming Method | Four SafeTouch through-glass buttons when cover is installed. Four internal push buttons when cover is removed. |
| Recalibration | Calibrated at the factory to read frequency in Hz. No recalibration required. |
| Input Power | 9-30 VDC, 38 mA max. 2.2 W |
| Enclosure | Explosion-proof die-cast aluminum with glass window, corrosion resistant epoxy coating |
| Mounting | May be mounted directly to conduit. Two slotted flanges for wall mounting or NPS 1½” to 2½” or DN 40 to 65 mm pipe mounting. |
| Display Orientation | Display may be mounted at 90° increments up to 270° from default orientation. |
| Overall Dimensions | 5.67″ x 5.24″ x 4.88″ (144 mm x 133 mm x 124 mm) (W x H x D) |
| Weight | 5.00 lbs (80 oz, 2.27 kg) |
Documents
Drawings
Tek-LCD-7804B