OMU 408UNI
4 digit 8 CHANNEL MEASURING INSTRUMENT
The OM 408UNI is an 8 channel measuring instrument designed for maximum usefulness and user comfort while maintaining its fair price. It is a multifunction instrument with the possibility of configuration for 8 different input options, easily configurable in the instrument menu. The instrument is based on a single-chip microcontroller with multichannel 24-bit sigma-delta converters, which ensure good accuracy, stability and easy operation of the instrument. Owing to the high rate of sampling on individual channels, there is a chance of evaluating all measuring inputs at the same time.
-
4 digit programmable projection
-
multifunction input (DC, PM, RTD, T/C, DU)
-
digital filters, tare, linearization
-
size of DIN 96 x 48 mm
-
power supply 10…30 V AC/DC or 80…250 V AC/DC
Options
-
comparators
-
data output
-
analog output
-
measured data record
Input
*
Number of inputs
4 inputs
8 inputs
8 inputs
DC
Range
menu selectable
±60 mV
> 100 MOhm
Input U
±150 mV
> 100 MOhm
Input U
±300 mV
> 100 MOhm
Input U
±1200 mV
> 100 MOhm
Input U
PM
Range
menu selectable
0…20 mA
< 400 mV
Input I
4…20 mA
< 400 mV
Input I
±2 V
1 MOhm
Input U
±5 V
1 MOhm
Input U
±10 V
1 MOhm
Input U
±40 V
1 MOhm
Input U
OHM
Range
menu selectable
0…100 Ohm
0…1 kOhm
0…10 kOhm
0…100 kOhm
0…100 Ohm
0…1 kOhm
0…10 kOhm
0…100 kOhm
Connection
2, 3 or 4-wire
RTD
Type
menu selectable
EU > 100/500/1 000 Ohm s 3 850 ppm/°C
-50°…450°C
RU > 50 Ohm s 3 910 ppm/°C
-200°…1 100°C
RU > 100 Ohm s 3 910 ppm/°C
-200°…450°C
US > 100 Ohm s 3 920 ppm/°C
-50°…450°C
Connection
2, 3 or 4-wire
Ni
Type
menu selectable
Ni 1 000/10 000 s 5 000 ppm/°C
-50°…250°C
Ni 1 000/10 000 s 6 180 ppm/°C
-50°…250°C
Connection
2, 3 or 4-wire
Cu
Type
menu selectable
Cu 50/100 with 4 260 ppm/°C
-50°…200°C
Cu 50/100 with 4 280 ppm/°C
-200°…200°C
T/C
Type
selecmenu selectable
J (Fe-CuNi)
-200°…900°C
K (NiCr-Ni)
-200°…1 300°C
T (Cu-CuNi)
-200°…400°C
E (NiCr-CuNi)
-200°…690°C
B (PtRh30-PtRh6)
300°…1 820°C
S (PtRh10-Pt)
-50°…1 760°C
R (Pt13Rh-Pt)
-50°…1 740°C
N (Omegalloy)
-200°…1 300°C
L (Fe-CuNi)
-200°…900°C
DU
Range
Configuration is performed in two steps:
| 1. | setting numerical value for the beginning and end of the potentiometer range |
| 2. | slider position calibration for the beginning and end of the potentiometer runway |
Potentiometer power supply
2 VDC/6 mA, potentiometer resistance > 500 Ohm
External inputs
Number
3 inputs, on contact
Functions
| OFF | No function |
| HOLD | Stopping measurement (option: Display - Analog output - Limits) |
| BLOK.K. | Blocking front panel keys |
| TARA x | Tare activation for channel A - H |
| TAR.VSE | Tare activation for all channels |
| TAR.AKT | Tare activation for current channels |
| NUL. T.x | Resetting tare for channel A - H |
| N.T. VSE | Resetting tare on all channels |
| N.T. AKT. | Resetting tare on current channel |
| NUL. M.M. | Resetting Min/Max. value |
| ULOZ | Data record activation (extention of RTC/FAST) |
| NUL. PA. | Resetting memory (extention of RTC/FAST) |
| PREP. | Gradual or BCD switching of the channels |
Projection
Display range
-99999…999999, single-coloured 14-segment LED
Secondary display
99, single-coloured 14-segment LED
9, single-coloured 7-segment LED
9, single-coloured 7-segment LED
Display height
14 mm
Display colour
red, green
Signalizing LED
| T | Tare (green) |
| M | Min./Max. value (green) |
Description
on secondary display
Decimal point
menu adjustable - fixed or floating
Display brightness
menu adjustable
Displayed values
| Kan x | Value from channel A - H |
| Fil. x | Value from channel A - H after digital filter adjustment |
| Mat. Fn. | Value of mathematical function |
| Max. | Maximum value |
| Min. | Minimum value |
Settings
Control
The device is controlled and set by five buttons on the front panel
Selected functions can also be controlled via external inputs
Selected functions can also be controlled via external inputs
Menu
| LIGHT | contains only items necessary for basic device settings with password access |
| PROFI | Full device settings with password access |
| USER | User menu of any item, selected from LIGHT/PROFI. Access without password. |
Optional functions
Buttons "Left", "Up", "Down", "Enter" can be assigned additional optional features
| ZAKAZ | button has no function |
| NUL. M.M. | Resetting Min/Max vaslues |
| NUL. T.x | Tare reset - for Channels A - H |
| NUL.VSE | Tare reset - for all channels |
| NUL.AKT | Tare reset -for current channell |
| MENU | Direct access to the selected menu item |
| DOC. H. | Temporary projection of selected values |
| TARA x | Activating function Tare - for Channels A - H |
| TAR.VSE | Activating function Tare - for all channels |
| TAR.AKT | Activating function Tare - for current channel |
| PREP. 1 | Switching channels on display - up |
| PREP. -1 | Switching channels on display - down |
| ULOZ | Starting recording of the measured data into device memory |
| NUL. PA. | Resetting memory of the measured data |
OM Link
Company communication interface for operation, setting and update of device firmware
OM Link program is also designed for visualization and filing of meas. values from more instruments
OM Link program is also designed for visualization and filing of meas. values from more instruments
Instrument accuracy and functionality
Temperature coefficient
50 ppm/°C
Accuracy
±0,02 % of range + 1 digit
(for projection 9999 and 5 measur./s)
(for projection 9999 and 5 measur./s)
Accuracy of cold junction measurement
±1,5°C
Rate
0,1…40 measur./s
Overload capacity
2x; 10x (t < 30 ms)
Resolution (RTD, T/C)
1°C, 0,1°C
Wire compensation (RTD, OHM)
< 30 Ohm
Cold junction compensation
adjustable -20°…99°C, automatic
Linearization
linear interpolation in 256 points and 8 tables (only via OM Link)
Digital filters
| arithmetic mean | from 2…100 measurements |
| floating mean | from 2…30 measurements |
| exponential mean | from 2…100 measurements |
| rounding | setting projection step for display |
Functions
| Tare | designed to reset display on non-zero input signal |
| Fixed tare | preset fixed tare |
| Min/max value | registration of min./max. value achieved during measurement |
| Peak value | display shows only max. or min. values |
Math. functions
polynom, 1/x, logarithm, exponential, power, root, sin x
Math. operations between inputs
sum, difference, product, and quotient
Data record
Measured data recording into the memory
Not available in combination with with the data output MODBUS
| RTC | period - 1 s…1 day, time-date-display value, < 266k data, 15 ppm/°C |
| FAST | 40 records/s, display value, < 8k data |
Watch-dog
reset after 400 ms
Calibration
at 25°C and 40 % r.h.
Comparators
Type
Digital, menu adjustable, contact connect. < 30 ms
Mode
| Hysteresis | switch. point, hysteresis band "Mez ± 1/2 Hys." and time (0 ... 99.9 s) determ. switching delay |
| From-To | output interval ON and OFF |
| Dose | period, its multiples and time (0 ... 99.9 s), during which the output is active |
Output
4x or 8x relay, switch on contact (250 VAC/30 VDC, 3 A)
Analogue outputs
Type
Isolated, programmable with a 16-bit D / A converter, type and range are menu selectable
Temperature coefficient
15 ppm/°C
Nonlinearity
±0,1 % of range
Rate
response to value change < 1 ms
Ranges
0...2 V, 0...5 V, 0...10 V, ±10 V, 0...5 mA, 0...20 mA, 4...20 mA
Compensation
600 Ohm/12 V
Error state
at range of 4...20mA
error message indication (<3.0 mA)
Detection of current loop interruption
error message indication (<3.0 mA)
Detection of current loop interruption
Data outputs
Protocol
ASCII, MESSBUS, MODBUS - RTU, PROFIBUS DP
Data format
8 bits + no parity + 1 stop bit (ASCII)
7 bits + even parity + 1 stop bit (Messbus)
7 bits + even parity + 1 stop bit (Messbus)
Rate
600…230 400 Baud
0,0096…12 MBaud (PROFIBUS)
0,0096…12 MBaud (PROFIBUS)
RS 232
isolated
RS 485
isolated, addressing max. 31 instruments
Power supply
Power supply
10…30 V AC/DC, ±10 %, PF > 0,4, I < 40 A/1 ms, isolated
80…250 V AC/DC, ±10 %, PF > 0,4, I < 40 A/1 ms, isolated
80…250 V AC/DC, ±10 %, PF > 0,4, I < 40 A/1 ms, isolated
Current draw
< 6,7 W/7 VA
Power supply protection
Power supply is protected by a fuse inside the instrument
Mechanical properties
Dimensions
96 x 48 x 120 mm (w x h x d)
Panel cutout
90,5 x 45 mm (w x h)
Material
Noryl GFN2 SE1, non-inflammable UL 94 V-I
Operating conditions
Connection
connector terminal board, cable section < 1,5/2,5 mm2
Stabilization period
within 15 minutes after switch on
Operating temperature
-20°…60°C
Storage temperature
-20°…80°C
Protection class
IP64 (front panel only)
El. safety
EN 61010-1, A2
Dielectric strength
4 kVAC within 1 min. between pow. supply and input
4 kVAC within 1 min. between pow. supply and data/anal. output
4 kVAC within 1 min. between input and relay output
2,5 kVAC within 1 min.between input and data/anal. output
4 kVAC within 1 min. between pow. supply and data/anal. output
4 kVAC within 1 min. between input and relay output
2,5 kVAC within 1 min.between input and data/anal. output
Insulation resistance
for polution degree II, measuring cat. III.
| power supply | 670 V (ZI), 300 V (Di)* |
| input, output, PN | 300 V (ZI), 150 V (Di)* |
EMC
EN 61326-1
Seismic capacity
IEC 980: 1993, par.6
SW validation
Compliance with IEC 62138, 61226, class B, C
Images
Connection
Dimensions and installation
Datasheets
| File name | File type | Version | Language | Download |
|---|---|---|---|---|
|
Datasheet OMU408UNI
Datasheet OMU408UNI
Datasheet OMU408UNI
Katalogový list OMU408UNI
|
PDF
|
2020.1 |
|
Download |
|
Datasheet OMU408UNI
Katalogový list OMU408UNI
|
PDF
|
2026.2 |
|
Download |
|
Datasheet OMU408UNI
Katalogový list OMU408UNI
|
PDF
|
2023.1 |
|
Download |
User manuals
| File name | File type | Version | Language | Download |
|---|---|---|---|---|
|
Operating instructions OMProfi
Návod OMProfi
|
PDF
|
2020.3 |
|
Download |
|
Operating instructions OMProfibus
Návod OMProfibus
|
PDF
|
2014.2.1 |
|
Download |
| Návod OMProfibus |
PDF
|
2014.2.0 | cs | Download |
|
Operating instructions OMProfibus
Návod OMProfibus
|
PDF
|
2010.1.2 |
|
Download |
| Návod OMProfibus |
PDF
|
2007.1.0 | cs | Download |
| Operating instructions OMProfibus |
PDF
|
2010.1.1 | en | Download |
|
Operating instructions OMU408UNI
Návod OMU408UNI
Operating instructions OMU408UNI
Operating instructions OMU408UNI
|
PDF
|
2013.3.0 |
|
Download |
|
Operating instructions OMU408UNI
Návod OMU408UNI
|
PDF
|
2008.1.4 |
|
Download |
|
Operating instructions OMU408UNI
Návod OMU408UNI
|
PDF
|
2007.1.3 |
|
Download |
| Návod OMU408UNI |
PDF
|
2007.1.2 | cs | Download |
| Operating instructions OMU408UNI |
PDF
|
2007.1.1 | en | Download |
| Operating instructions OMU408UNI |
PDF
|
2007.1..2 | en | Download |
Application notes
| File name | File type | Version | Language | Download |
|---|---|---|---|---|
|
Application note Modbus commands OMU 408UNI
Aplikační list Modbus prikazy OMU 408UNI
|
XLS
|
2019 |
|
Download |
| Application note Protocol MODBUS description |
PDF
|
2006.01 | en | Download |
Certificates
| File name | File type | Version | Language | Download |
|---|---|---|---|---|
|
Certificate EU_Declaration_OMU408
Certifikát EU_Prohlaseni_OMU408
|
PDF
|
2022 |
|
Download |
|
Certificate Declaration_17050_OMU408
Certifikát Prohlaseni_17050_OMU408
|
PDF
|
2022 |
|
Download |
|
Certificate Seismic_test_OMU408UNI
Certifikát Seizmicka_zkouzka_OMU408UNI
|
PDF
|
2008 |
|
Download |
Firmware
| File name | File type | Version | Language | Download |
|---|---|---|---|---|
| OMU408ADC 68-002 |
HEX
|
2018 | xx | Download |
| OMU408UNI 68-003 |
HEX
|
2019 | xx | Download |
Software
| File name | File type | Version | Language | Download |
|---|---|---|---|---|
|
GSD OM-Profibus
GSD OM-Profibus
|
ZIP
|
2020 |
|
Download |
| GSDML OM-Profinet |
ZIP
|
2020.2.33 | xx | Download |
| GSDML OM-Profinet |
ZIP
|
2024.2.33 | xx | Download |
CAD
| File name | File type | Version | Language | Download |
|---|---|---|---|---|
| OM Krabicka |
DWG
|
2014 | xx | Download |
ISOLATED TRANSDUCER • USB < > OM INSTRUMENTS
Small compact transducer OM LINK USB with cable ensures safe and comfortable galvanically isolated connection between your computer and ORBIT MERRET instruments.