Nokeval 2041 User manual

1
User's Manual
Model 2041
for strain gauge
sensors
No 270503
Nokeval

2
Manufacturer:
Nokeval Oy
Yrittajakatu 12
FIN-37100 NOKIA
Tel. [phone]
Fax. [phone]
Index
General ............................................................................................................................ 3
Technical specifications ................................................................................................... 4
Dimensions ....................................................................................................................................... 4
Terminal connections ........................................................................................................................ 5
Front panel and keys ........................................................................................................ 6
Configuration ................................................................................................................... 7
Configuration parameters................................................................................................. 8
Output 0/4-20 mA and 0..10 V (option) ............................................................................. 9
Output connections ........................................................................................................................... 9
Alarm (option) ................................................................................................................ 10
Alarm relay connections.................................................................................................................. 10
Serial output RS-485/RS-232 (option) .......................................................................... 11
Serial output connections ................................................................................................................. 11
Serial communication...................................................................................................................... 12
Serial protocol (SCL) ....................................................................................................................... 12
Secret code ................................................................................................................... 13
Panelmeter 2000 construction ........................................................................................ 14
Modular indicator series 2000 ........................................................................................ 15

3
DAC
E²
E²
60.000
Alarm relays (B or C)
Serial communication(B or C)
Output (B)
ADC
16 bit
mV-output
+ Sense
- Sense
I = max. 150 mA
+10 V
2041 Panelmeter for strain gauge sensors
Modular panelmeter 2041
6-digit bright red
LED panel meter
Configuration and
display scaling via
front panel keys
Input card A:
- microprocessor
- bus control
- panel key reading
- display control
- output and alarms
Power supply:
85..240VAC or
12..32 VDC / 24 VAC
Options (B-C):
Alarms:
2 to 4 relays
Outputs:
0/4..20 mA, 0..10 V
RS-232 or RS-485
Option cards, slots B or C
The versatile panelmeter 2041 is designed for strain gauge
sensors. Strain gauge sensors can be connected with 4 or 6
wires. The 6-wire connection removes the lead wire resistance,
as bridge voltage is measured from the sensor poles, and
therefore it is recommended for applications requiring very
high accuracy. The panelmeter provides 10 V excitation voltage
for sensors, max. four 350 ohm sensors. Options to the 2041
include output 0/4-20 mA , 0-10V, 2..4 alarms or serial output
RS-485/232.
Display scaling and taring is easy via front panel keys. Scaling
can be carried out in two different ways, either by applying the
mV values of the bridge or using the teaching function. The
teaching is done by first loading the sensors with the min.
weight and then with the max. weight, after which the meter
will
automatically count the scaling.
In applications where the sensor loading is not in balance a
separate serial connection unit of the sensors 20 SA-4 can
be used to prevent the nonlinearity caused by the imbalance.
There are two power supply alternatives: one for line voltage
85..240 VAC and the other 12..32 VDC/ 24 VAC, both
galvanically isolated from input and output. Analog
conversion is done by a 16-bit AD-converter (resolution 1/
64000) and the number of measurements is 3 per second.
Separate passwords can be set for access to the
configuration menu and alarms. The display can be damped
with a digital filter if necessary. The number of decimals on
the display is selectable. Front panel protection rating is
IP65.
The panelmeter series 2000 is very flexible and easy to
modify by changing input cards for different kinds of sensors,
such as temperature sensors, pulse sensors, serial inputs
etc. The modification does not require any calibration. The
optional cards are the same for all the instruments in this
product family. Each panelmeter type has its own datasheet.
Separate field enclosures can be supplied for 1 to 3
panelmeters.The 2041 is also available in the field display
series, model 2800-2041.
The panel meter can easily be
modified to accept other sensors by
only changing the input card A
Input card 2041
• Strain gauge sensors with 4- or 6 -wire connection
• Excitation voltage 10V to sensors, max 150 mA
• 6-digit processor-based LED-display
• Settings via front panel keys
• Output 0/4..20 mA, 0..10 V
• Serial output RS-232 or RS-485
• 2 - 4 alarm relays
• Display taring via front panel key
• Measuring accuracy < 0,05 % of span
• Power supply 85..240 VAC or 12..32 VDC/ 24 VAC
1-4 sensors

4
96
48
105
10
Gasket (IP65)
6
Panel cut out
43.5 (K) x 90.5 (L) mm
ø2,0
Dimensions
Case corners have pins
which help installation.
Pins centralizes meter
into panel cut out made
with DIN-tool.
Technical specifcation:
Sensor strain gauge, max 350W parallel
Sensor connection 4- or 6 -wire connection
Bridge connection full bridge or half bridge
Bridge supply 10 VDC, max. 150 mA
Measuring range 25..50 mV
Sensitivity settings mV/V, freely selectable
Accuracy <0,05 % FS
Repeatability <0,02 % of span
Temperature drift 0,0028 % /°C
Output (option):
Outputs 0..20 mA, 4..20 mA and 0..10 VDC
Output range scaleable on the whole display
range,
scaling via front panel
Accuracy 0,05% of the scaled display range
Galvanic isolation test voltage 2000 VDC
Load resistance maximum 700W
Alarms (option):
Relays 2..4 alarm relays, max 230 VAC / 2A
Optional cards 2000-REL2 or 2000-
REL3, 4 relays (2x 2000-REL2)
prevent the use of other options
Serial output (option):
Serial output RS-232 and RS-485
Only for measurement reading or
setting of alarms
Baud rate 300, 1200, 2400, 4800, 9600
or 19200
General:
Display range 6 digits, bright red (or green) LED ,
digit height 14,5 mm, brightness
selectable
Display scaling on the whole range via front panel
Display taring via front panel keys
Teaching function applying min/max weights
Configuration via front panel keys
Case 96 x 48 x 110 mm
Front panel protection IP65, with a rubber gasket
Operating temp. 0..60 °C
Terminals detachable, max. 1,5 mm²
Power supply 85..240 VAC or 12..32 VDC /
24VAC
Weight 240 g
How to order: 2041-OUT-REL2-24VDC
Type
Output OUT
Alarm card REL2
Power supply:
85..240VAC or
12..32 VDC/24VAC
Optional cards (2 options available at a time):
Output card 2000-OUT
Alarm card, 2 relays 2000-REL2
Alarm card, 3 relays 2000-REL3
Serial output, RS-232/485 2000-RS
(When ordering a panelmeter, the “2000” of the cards
is left out.)
The panelmeter ia also available with a green
LED display: please specify 2041GR in the order code.

5
Terminal connections:
6
5
4
3
2
1987
6
5
4
3
2
1
6
5
4
3
2
1
+10V exitation
+ input
- input
0 V
+ sense
- sense
AB C
Power
85..240 VAC
or
12..32 VDC
3 (+) and 1 (-)
+ 4-20 mA
+ 0-10V
Common
Card slot B for
optional card:
analog output
Bridge sensor
Max 4 x 350 ohm (150 mA)
Exitation voltage from terminals 6
(10V) and 1 (0V)
2041
Sensor cable protective sheath is connected
only in one point into terminal 1.
Connecting bridge sensor with 4- or 6- wires:
Bridge sensors exitation voltage is measured directly
from sensor poles. Processor corrects display value
if voltage differs from 10 Volts. Selected 6-wire con-
nection technique enables also use of separate volt-
age supply which voltage may vary between 7..13 V.
Unit accepts also 4-wire connection but then the
sense wires must be connected to voltage supply
terminals (short cut 5-6 and 1-2). This 4-wire connec-
tion can be used if the accuracy demand is unimpor-
tant or if the sensor lead wire error is corrected by
rescaling the display with known error.
If the sensror is not connected with 6-wires the lead
wire resistance will reduce the exitation voltage and
display shows too low values. How big this error is
depends on the current level in wires and on line
resistance.
An example: If the line resistance on each sensor is
2 ohms it means that four 350 ohm bridges in parallel
causes 87,5 ohm load to 10 V exitation voltage.
6
5
4
3
2
1
+10V exitation
+ input
- input
0 V
A
Bridge sensor
Sense-wire connection
4-wire connection
Sensor current can be calculated as: 10V/87,5 ohm
=114,2 mA. Voltage in bridge poles is then:
10V-(114,2 mA x 2 ohm)=9,776V.
Sensor message is 2,24 % too low compared to
10.000V exitation voltage. Bridge exitation voltage is
directly comparable to received mV-input and vice
versa. Model 2041 has continuous exitation voltage
measurement function and therefore voltage don't
have to be exact in bridge poles.
Half bridge connection:
Model 2041 accepts also half bridge sensor. This is
an optional function which must be specified when
ordering the unit. Unit which is ordered for half bridge
sensor can be used with full bridge connection by
replacing the short cut jumber as drawn below.
Riviliitin
Half bridge = Short cut connected
Full bridge = No short cut (default)
6
5
4
3
2
1
2041
+10V exitation
+ input
0 V
+ sense
- sense
Half bridge connection
Half bridge connection in below picture. Terminal 3 is
not connected. Sensor cable protective sheath is
connected only in one point into terminal 1.

6
Configuration
You can enter configuration stage by pressing two
seconds ▲ and ★-keys at same time. In program
stage f. ex. scaling of display, sensor selection and
alarm mode are chosen.
See closer in chapter programming.
Display Tare procedure:
Press and hold right arrow (>) until display shows
0000 (approximately for 3 s). Display is tared and
ready to measure.
*
5620.0
Front panel and keys
With ▲▼-keys You can move on or change
numbers and values in programming menu.
Accptance of chosen stage of program
Alarm lights A1 and A2
Conf-light indicates
program stage
Setting of alarms
By first pressing of ➤key you can see setpoint of
alarm one (A1), correspondingly by second pressing
setpoint of alarm two (A2) etc. Third pressing returns
display to normal stage. Alarm indication light blinks
showing that alarm has been set (if you do not touch
keys you come to normal stage automatically).
When indication light blinks (A1 or A2) you can
change alarm value by pressing ▲and ▼ key. You
may have optional alarm relays for each alarm level.
Alarm mode, hysteresis and other settings must be
set in configuration menu. If you do not touch keys
during 8 seconds display returns to normal state
automatically and save settings.
400.00
Number setting
Numbers
0...9 and , (decimal)
Setting of alarm value
You can set alarm value by ▲▼-keys number by
number. Setting starts from largest number from
left to right. You may go to next number by ➤-key.
Exit by ★-key.

7
Sens
Load
Dec
Filter
Halt
Bri
Output
Alarm 1
Alarm 2
Serial
Code
Cal
Save
Undo
➤
➤
➤
➤
➤
➤
➤
★
Configuration
You can enter configuration state by pressing two
seconds ▲▲
▲▲
▲and ★★
★★
★keys at same time. By arrow keys
▲and ▼you can move upwards and downwards in
main menu. By pressing ➤➤
➤➤
➤key you can enter
configuration state at wished point. From setting
state you can skip direct to save state or to previous
Select display value with 6 digits for max. load of sensors,
number of decimals are selected separately
Select sensor selectivity Default 2mV/V
Digital filter for input signal (damping) selectable 0.01...1.0
(1.0= no filter)
Save settings and exit from configuration.
level with ★★
★★
★key. You may set alarms in configuration
or in display stage. Alarm levels can be set in configu-
ration state or measuring state. You can cancel changes
by selecting text UnDo to display and by pressing ➤➤
➤➤
➤
key. Next page describes in more details configuration
functions.
Select number of decimals
0 = no decimals in display
Display brightness 1..15=brightest, Default 7
Undo changes and exit from configuration.
Configuration start:
Press two second ▲and
★keys at same time
Unit calilbration state (factory setting)
Alarm 1 settings (page 11)
Alarm 2 settings (4 relays selectable in menu)
Output settings (page 10)
Serial output settings (page 12)
Secret code settings (page 14)
Display shows zero below Halt value, e.g. on range
0..5.0 display should be showed zero, set Halt = 5.0
Description

8
Configuration parameters
Sense
Typical sensor sensivity is 2 mV/V which you will find
in label of sensors. Change SET value according to
sensivity of sensors. Changing this value will have
reserved effect on display. For example changing
default selecetivity 2 mV/V to 2,2 mV/V, display
reading will reduce 10%.
Measuring range is defined from selectivity as follows
Sensor selectivity 2 mV/V is multiplied with the bridge
voltage. If selectivity is 2 mV/V and the bridge voltage
is 10 V the input measuring range will be 20 mV (2 mV/
V x 10V =20 mV).
Load: Set or Teach
You can make scaling by two different ways as follows:
SET selection indicates the weighing value which
gives the maximum signal from the bridge. Unit uses
this value to calculate the maximum mV-signal with
maximum load on sensor. If display value is e.g. 5%
too low you can fix the display by increasing the Load
value 5%.
Teach selection gives possibility to use reference
loads for scaling, see page 9.
Dec
Number of decimals in display. Select 0…5 with st-
keys and accept with H-key.
Filter
Display filtering. Filtering damps restless display by
large number values. Measuring interval is 0,4 s.
Value setting between 1(min) ..0.010 (max).
1.000 = no filter
0.200 = normal filtering
e.g. 0,2 =(1/5) one new value + 4 old values
or 0,1=(1/10) one new + 9 old values (very steady)
Halt
Display can be set to show zero below Halt value e.g.
the display should be showed zero when weighing
value is under 10, set halt value 10. You can use also
negative values.
Bri
Display brightness 1..15 = brightest. Default 7.
Output (option)
Output settings. See chapter "Output"
Alarm 1 and 2 (option)
Alarm settings. See chapter "Alarm"
Serial (option)
Serial output settings. See chapter "Serial output"
Code
Secret code settings. See chapter "Secret code"
Cal
For factory settings
Undo, Save
Exit from configuration stage without saving changes
(Undo) or save and exit (Save).

9
Scaling of display
Display can be scaled on two different ways.
Select LOAD in menu and press ➤-key.
SET: Enter display value on max.loading signal from bridge.
Example: If sensor gives 2 mV/V and supply voltage for sensor is 10 V, max
signal from bridge is 2 mV/V x 10V = 20 mV. If you like to show 5000 for max input
signal (20mV), SET value = 5000. The display range is now 0-5000 on input 0-20 mV.
TEACH: You can teach scaling of display by using two reference loads.
Load
10.0000
(Mittaus Lo)
(Mittaus Hi)
Set
Teach Load 1
Load 2
Æ
X
X
X
1000.00
Æ
X
Æ
Zero
Main menu
Set Set display value on max input
signal
Teach You can teach display using
two reference loads.
Set minimum reference load
Accept min. load by pressing ➤-key
Set value respecting minimum load
with 6 digits. Showed decimals are only
for setting. (Display desimal setting is
made in main menu)
Accept setting by ★-key
Set maximum reference load
Accept min. load by ➤-key
Set value respecting maximum load
with 6 digits. Showed decimals are only
for setting. (Display desimal setting is
made in main menu)
Accept teaching by pressing ★-key
Return by
★-key
Zero shifting (factory setting = 0)
This function is recomended only when taring or teaching functions can not be made.
You can shift the display to zero or other values by using zero shifting. Typical
application is level measurement based on buoyancy in whrere max level of tank = zero
load and min level of tank = max. load (opposite to normal weighing).

10
Output Type
Zero
Span
Cal
★
➤
➤
OFF
0-20 mA
4-20 mA
0-10 V
➤
Current
Voltage
Output 0/4-20 mA and 0..10 V (option)
Main menu
Output type selection
Set display value on min output 0 V,
0mA or 4mA. e.g. display 0.0 kg=4 mA
Set display value on max output 10 V or 20mA, e.g.
2000.0 kg = 20 mA
Output signal calibration.
Output card is calibrated in the factory and only
scaling of output is needed.
Output connections
Slot B
6
5
4
3
2
1
Output 4-20 mA
0-20 mA
4-20 mA
Slot B
6
5
4
3
2
1
Output 0-10V
0-10V
(+)
(-)
(+)
(-)
★-accept and return
to main menu
The display may be provided with isolated output,
ranges 0..20 mA, 4..20 mA or 0..10 V, which are
programmable.
You can mount output card to slot B or C (default B).
Calibration information is saved to card and no cali-
bration is needed in configuration. You need not select
card in programming because meter recognizes the
mounted card.
Programming: select Output selection in main menu
and press ➤key. See below description.