Nokeval 301 User manual

1
User's Manual
Models 301 & 302
and 305 & 306
No 050101 Nokeval

2
Contents
AutopoweredLED-displays ............................................................................3
General description .............................................................................................................3
Disabling front panel keys .................................................................................................. 4
Front panel buttons and indicators..................................................................5
Configuration mode ................................................................................. 5
Resetting configuration parameters......................................................... 5
Alarm level setting ................................................................................... 5
Alarm functions........................................................................................ 5
Disable alarms......................................................................................... 5
Manual reset............................................................................................ 5
Configuration ..................................................................................................6
Enter configuration mode ........................................................................ 6
Access code for configuration ................................................................. 6
Description ........................................................................................................................... 7
Input terminals ......................................................................................... 7
Alarm connections, only with model 302 ................................................. 7
Measuring mode ..................................................................................................................7
Configuration mode ............................................................................................................. 7
Alarms off ................................................................................................ 7
Manufacturer:
Nokeval Oy
Yrittäjäkatu 12
37100 NOKIA
FINLAND
Tel. [phone]
Fax. [phone]
email [email protected]
http:// www.nokeval.com

3
Autopowered LED-displays
AutopoweredbrightredLED-displaysneednoexternal
power supply. Current signal 4-20 mA provides the
necessary energy. Therefore, it is possible to install
themeterinplaceshavingnoauxiliarypoweravailable.
YoucannowreplacetheautopoweredLCD-displays,
havingverypoorvisibility, bybrightredLED-displays.
There are four models according to optional alarms
andplasticcase(ABS)IP65size:100x100mmbasic
model 301 without alarms and model 302 with two
alarm contacts. Correspondingly models 305 and
Transmitter
4-20 mA
4-20 mA
Alarm 1 (low level)
Alarm 2 (Hi
g
h level)
General description
Models 301 and 302 have
space for scale plate
306 are in 82 x 80 x 57 mm case. Both size versions
has same functions.
Display scaling and configuration by front panel
buttons.Unithasdigitalfilter forstabilizingthe4-digit
display. In models 302 and 306 You may configure
two optional alarms, high and low. More versatile
alarm settings and alternative alarm modes offers
our powered models 2011 and 2021. Password is
settable for entering configuration and alarm stages.
• For process input 4-20 mA
• Without external power supply
• Loop resistance 240 ohm only
• 4-digit processor based display
• Scaling on front panel
• 2 settable alarms (option)
• Passwords for alarms and
configuration
• Field enclosure rating IP 65
Uz=4,8 V
Semiconductor fuse
10 ohm
4..20 mA
Polarit
y
protected
(
+
)
(
-
)
3240

4
Input
4-20 mA
Low
level
High
level
Connections:
Case dimensions (mm):
Inlets 2 x 11 mm PG
Case protection IP65
Case material ABS.
Models 305 and 306 dimensions
are in brackets.
This small size enclosure
has only one PG11 inlet.
Terminal 3 is not used
Relays max. 250 VAC, 150 mA
Alarm only in models 302 / 306
Input 4..20 mA
Display scaling -999....+9999
Accuracy 0.05% of span
Input voltage drop 301 continuous 4,8 V = 4-20 mA (comparable 240 Ω, non resistive)
302 continuous 7,3 V = 4-20 mA (comparable 340 Ω, non resistive)with alarms
Alarmrelays(option) 2 solid state relays (SSR), max. 250 VAC, 150 mA
Alarm reset automatic or manual (hold) via front panel key
Alarm mode High and low level
Hysteresis Selectable 0..100 %
Display 4-digit red LED, 14.5 mm, adjustable brightness
Push buttons Switches under front panel surface
Case protection IP65
Case material and color ABS-plastic, grey
Case dimensions: 301/302 100 x 100 x 57 mm
305/306 82 x 80 x 57 mm
Ambient temperature 0...+60 °C
Terminals Detachable 2,5 mm² (models 305 and 306 1,5 mm²)
Weight 200 g
Technical specifications:
Order codes:
Model 301-4/20 mA 4-digit 4-20 mA loop powered indicator
Model 302-4/20 mA With optional 2 alarms
Model 305-4/20 mA Smaller case 82 x 80 x 57mm
Model 306-4/20 mA Smaller case with alarms
100 (80)
100 (82)
57 (57)
654 7
321 -
+
Disabling front panel keys
Use of front panel keys can be
enabled/disabled with short cut
jumper.Whenshortcut jumperis
installed keys can be used to
configure and set alarm levels.
A2 A1

5
5620
*
Nokeval
Conf
Front panel buttons and indicators
▲▼-arrow-buttonsareusedtochangenumerical
value and for moving on configuration menu.
Exit from selected configuration stage
Alarm indicator LED's A1..A2.
Conf-led indicates
configuration mode
Configuration mode
Configurationcanbestartedbypressingandholding
★- and ▲-keys simultaneously for 2 seconds.
Configuration stage is for selecting input, display
scaling and alarm function.
Specified instructions on pages 6-7 section
Configuration.
Resetting configuration parameters
Some times it is necessary to return indicator
parameters to factory defaults, e.g. if secret access
code is missed. Resetting can be done by pressing
and holding ★- and ➤-keys simultaneously for 2
seconds when connecting input signal 4..20 mA.
Prosedure will reset all settings to factory defaults.
Alarm level setting
Alarm levels are selected with ▲▼-buttons one number at a time.
Changing begins from the most signifigant digit on the left, desimal
point is selected first. Next digit to right is selected with ➤-button.
Accept and exit with ★ -button.
Enter selections in
configuration stage
400.00 400.00
Value selection Selecting next digit
Numbers
0...9
Desimal point selection
with -keys before
number selection
Alarm functions
Alarmscanbeviewedinconfigurationmode.Special
instructions on pages 6-7, section configuration.
Disable alarms
Negative hysteresis value disables alarm function.
Manual reset
Auto reset is a standard function. Manual reset with
frontpanel▼-key canbeselectedbychoosingwider
hysteresisthanfullspan(Hi-Lo). For example: Input
scaling is 0..100,0 i.e. full span is 100. Select
hysteresis larger than 100 (9999) and You will have
manual reset.
Place for
dimension
(301 and 302)

6
CAL
CFCO
TrF
Inte
FiLt
Hi
Lo
ALHy
AL H
AL L
SAVE
UnDo
CODE
Old value State of
change New value
DEC
Old value State of
change New value
*
*
Configuration
Configurationcanbestartedbypressingandholding
★- and ▲-keys simultaneously for 2 seconds. Arrow
keys▲▼movesupanddowninmainmenu.Desired
function is selected with ➤-key. Save mode can be
selected directly by pushing ★-key in main menu.
Enter into configuration mode
Configurationcanbestartedbypressingandholding
★- and ▲-keys simultaneously for 2 seconds. Arrow
keys▲▼moveupanddowninmain menu.
Display intensity 1-15.
15 = brightest
Digital filter, factory default 0,2.
Value 1 means no filter
Display scaling for 20 mA, maximum value.
e.g. 20 mA=1000, decimals are selected in
section DEC. Same routine as section Lo.
LO and HI
Display scaling for 4 mA.
Pointselectsnumberofdigits
(notdecimals)(▲▼)andthen
select minmum scale value
witharrowkeys(➤)(▲▼).
Number of decimals is
selctedinsectionDEC.When
exiting with ★-key, display
show selected value with
decimals.
Alarm values and hysteresis are selected in
configuration mode.
ChangescanberestoredbyselectingtextUnDOinto
display and pressing ➤-key. Note! Detailed
configuration stage description on next page.
Undo changes
and exit
Return(★)
Pass word for configuration mode
Decimals 0-3
(▲▼)
High alarm setting, same routine as low level setting.
For factory use only.
Square root function: LIN = linear display
Sqrt = square root display
Save and
Exit
Low level alarm setting.
Return(★)
Hysteresis0..50%.Negativevalue disables alarmfunction.Manual
reset with front panel keys can be selected by choosing wider
hysteresis than full span (Hi -Lo).
Access code for configuration
Configuration mode can be secured with pass word.
IffunctionisselectedunitasksCODE.Enterrequired
key combination as shown on page 7 section CFCo.

7
Description
Input terminals
1(+) signal loop (4…20mA)
2(-) signal loop
3Not used, can be used as a spare terminal
Voltagedropin4..20mAinputloopismax4.8V.This
corresponds 240ohmloopresistance.Whenalarms
are used (optional) voltage drop is max 7,3 V. Input
is secured for reversed polarity and over current
tolerance is 100 mA.
Alarm connections, only models 302 and 306
6,7Lowlevelalarm,displayislowerthanalarmlevel
4,5Highlevelalarm,displayishigherthanalarmlevel
Solid state relays,SSR: max. 250 V ±DC/AC,
150 mA, 12 ohm. Isolation between input loop 4 kV.
Alarms can be taken into use by removing jumper
inside the case. Voltage drop will increase to 7,3 V.
Measuring mode
Thisis normaloperating mode.Scaled inputsignal is
in display. LED indicator functions are:
A1 = Low level alarm
A2 = High level alarm
Conf = Unit in configuration or calibration mode
Measuring mode can be changed to Configuration
modebypressingsimutaneously▲★-keys.Ifaccess
code is used it must be entered when display shows
Code.
Configuration mode
Undo,Save➤➤
➤➤
➤
Exit from configuration mode. SAVE saves new
configuration and Undo exits without saving.
AL L, AL H ➤➤
➤➤
➤
Alarmlevels(L=low,H=high).Bothalarmscannotbe
energized at the same time. Therefore low level
cannot have higher value than high alarm and vice
versa.
If input signal is under 3 mA relays will be de-
energized. (Normal open 'NO' relays need energy to
be closed).
ALHy➤➤
➤➤
➤
Alarm hysteresis is number of digits below or above
selected alarm level (both sides have same value).
Normally alarm relays are enegized when display
value goes to alarm level and de-energized when it
goesoverhysteresisvalue.
Alarms can also have manual reset when hysteresis
value is set larger than measuring range (full span).
Manual reset is done with ▼-key from front panel.
An example of Manual reset / hold function:
High level alarm is 100 °C and low level -5 °C. When
inputisover100°C,LEDA2 lits(relayA2energized)
anditdon'tgooffeveniftheinputgoesbelow100°C.
It must be resetted manually with front panel key ▼.
Alarmwillberesettedalsoifinputgoesbelowselected
low level (-5°C). That is because both relays cannot
be energized at the same time. If You do not want to
usethispossibilitygivenbytheotheralarm,selectit's
value outside that the scaled range (not in use).
Alarms off
Negative hysteresis value disables alarm function.
Dec➤➤
➤➤
➤
Decimal selection 0..3, i.e. 0.9, 0.99 or 0.999
Lo, Hi ➤➤
➤➤
➤
Lo andHi scalesdisplay toinputsignal4..20 mA.Lo
value is selected for input 4 mA and correspondingly
Hi value is for 20 mA input.
e.g. 4..20 mA = display Lo -100.. Hi +200
Filt➤➤
➤➤
➤
Display Filter. This fucntion stabilizes display value
when wide measuring range is used.
Filtervaluecanbesetbetween1(min)..0.010(max).
1.000 = no filter
0.200 = normal filter
e.g. 0.2 =(1/5) one new measurement and 4 old
values or
0.1 = (1/10) one new + 9 old values (slower)
Alarms are controlled with the filtered value (filter
affects to alarms reaction time).
Inte➤➤
➤➤
➤
Display intesity (brightness). You can change the
intensity with ▲▼-buttons. Hold ▼-key to decrease
intensity and vice versa.
Inmeasuringmodeintensitydecreasesautomatically
when input is under 6 mA.
TrF➤➤
➤➤
➤
Transfer function selection.
Lin = normal fnction
Sqrt = square root function
CFCo➤➤
➤➤
➤
Access code for configuration mode. Access code is
formed with ▲▼★➤-keys. Code is formed with six
pushes of front panel buttons. Not in use when code
issetto(★★★★★★)(factorydefault).
If configuration access code is forgotten, all the
settings can be returned to factory defaults (not
calibration) by holding down buttons ★and ➤while
connecting input signal 4..20 mA.

8
Manufacturer:
Nokeval Oy
Yrittäjäkatu 12
37100 NOKIA
FINLAND
Tel. [phone]
Fax. [phone]
email [email protected]
http:// www.nokeval.com
Calibration
When calibrating, accurate 4 and 20 mA signals are
needed.Thedeviceisfactorysuppliedcalibrated,
and it is scaled to display 0-100.0 unless ordered
differently.
CAL >
Ifthedevicedisplaysincorrectreadings(morethan
0.05%ofrange),itshouldberecalibrated.Before
doing that, ensure that the input signal is correct
(using a separate mA meter) and that the scaling
(Lo,Hi)isappropriate.
Enter configuration menu, select CAL and press ➤
key.Entercalibrationpassword112213,
▲▲▼▼▲★. “4_20” is displayed.
Feed a precise 4.000 mA signal to the device and
press ▼key. Wait until the display reappears. Then
feed20.000mAand press ▲key.Calibrationvalues
arestored immediatelyandcannotbeundone.
Finally exit to the configuration menu with ★key.