programmable dual-channel transmitter
Typically in stock
6821 is a rail-mounted two-channel measurement unit for temperature sensors and other electrical inputs. If needed the device can use inputs of different types on its channels. The unit has two analog outputs or alternatively the second output can be serial RS485 output. The device has up to four logical alarms with two alarm relays. Power supply is 90...240 VAC or 24 VDC.
There are four built-in inter-channel functions: average, difference, minimum, and maximum.
With MekuWin configuration software and simple Nokeval ELo-language, programs can be written to make the device calculate more mathematical and conditional operations and even timed events.
Writing your own functions
Measurement results and alarm states are written into registers. Users can easily write simple programs to modify registers F1-F12 (@18..29) using Nokeval’s ELo language and MekuWin configuration program. Any register can be used in the programs and as an output source.
How to write simple program?
The program consists of lines. Every line has one simple command. The command can change a register or cause a conditional jump inside the program. The program is entered in the configuration settings with Mekuwin. Example: temperature input 1 controls output 1 together with input 2.
Flow sensor pressure compensation example
The mass flow rate can be easily calculated using the 6821 transmitter. Use channel 1 to measure the flow, channel 2 to measure the pressure and write a small program using ELo language. For example, the program for the equation “Out1=(Ch1 x Ch2) x1.12/1000“ is found from programming examples.
F2=In1*In2 // Channel 1 and 2 are multiplied, result in register F2
F1=F2*0.00112 // Register F1 = (Ch1 x Ch2) x 1.12/1000
Then the desired output is configured to follow the result, e.g. Outputs/Out1/Src = F1.
Load manuals (pdf)
Load datasheets (pdf)
Pt100, Pt1000, KTY83, thermocouples, mV, V, mA, Ohm
supply for transmitter
+15 V, 50 mA
both channels 0.25 s
mA: 0...20 mA or smaller
V: 0...10 V or smaller
mA: 0...600 Ω
1200, 2400, 4800, 9600, 19200, 38400, 57600
number of digits
7 segment LED
configuration state and alarms
24 VDC: 200 mA
240 VAC: 5 W
230 VAC: 85-260 V AC/DC
45 x 100 x 110 mm (WHD)
35 mm DIN rail
minimum ambient temperature
maximum ambient temperature
USB to RS485 converter