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User's Manual
Models 301 & 302
and 305 & 306
No 050101
Nokeval
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Contents
Autopowered LED-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
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Autopowered LED-displays
Autopowered bright red LED-displays need no external
power supply. Current signal 4-20 mA provides the
necessary energy. Therefore, it is possible to install
the meter in places having no auxiliary power available.
You can now replace the autopowered LCD-displays,
having very poor visibility, by bright red LED-displays.
There are four models according to optional alarms
and plastic case (ABS) IP65 size: 100 x 100 mm basic
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. Unit has digital filter for stabilizing the 4-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
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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)
30 2 continuous 7,3 V = 4-20 mA (comparable 340 Ω, non resistive) with alarms
Alarm relays (option) 2 solid state relays (SSR), max. 250 V AC, 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. When short cut jumper is
installed keys can be used to
configure and set alarm levels.
A2 A1
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5620
*
Nokeval
Conf
Front panel buttons and indicators
▲▼-arrow-buttons are used to change numerical
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
Configuration can be started by pressing and holding
★- 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
Alarms can be viewed in configuration mode. 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
front panel ▼-key can be selected by choosing wider
hysteresis than full span (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)
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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
Configuration can be started by pressing and holding
★- and ▲-keys simultaneously for 2 seconds. Arrow
keys ▲▼ moves up and down in main menu. Desired
function is selected with ➤-key. Save mode can be
selected directly by pushing ★-key in main menu.
Enter into configuration mode
Configuration can be started by pressing and holding
★- and ▲-keys simultaneously for 2 seconds. Arrow
keys ▲▼ move up and down in main 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.
Point selects number of digits
(not decimals) (▲▼) and then
select minmum scale value
with arrow keys (➤) (▲▼).
Number of decimals is
selcted in section DEC. When
exiting with ★-key, display
show selected value with
decimals.
Alarm values and hysteresis are selected in
configuration mode.
Changes can be restored by selecting text UnDO into
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 (★)
Hysteresis 0..50%. Negative value disables alarm function. 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.
If function is selected unit asks CODE. Enter required
key combination as shown on page 7 section CFCo.
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Description
Input terminals
1 (+) signal loop (4…20mA)
2 (-) signal loop
3 Not used, can be used as a spare terminal
Voltage drop in 4..20 mA input loop is max 4.8 V. This
corresponds 240 ohm loop resistance. When alarms
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, 7 Low level alarm, display is lower than alarm level
4, 5 High level alarm, display is higher than alarm level
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
This is normal operating mode. Scaled input signal 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
mode by pressing simutaneously ▲★-keys. If access
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
➤➤
➤➤
➤
Alarm levels (L=low, H=high). Both alarms cannot be
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 deenergized. (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
goes over hysteresis value.
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
input is over 100 °C, LED A2 lits (relay A2 energized)
and it don't go off even if the input goes below 100 °C.
It must be resetted manually with front panel key ▼.
Alarm will be resetted also if input goes below selected
low level (-5°C). That is because both relays cannot
be energized at the same time. If You do not want to
use this possibility given by the other alarm, select it'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 and Hi scales display to input signal 4..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.
Filter value can be set between 1 (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.
In measuring mode intensity decreases automatically
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
is set to (★★★★★★) (factory default).
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.
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Manufacturer:
Nokeval Oy
Yrittäjäkatu 12
37100 NOKIA
FINLAND
Calibration
When calibrating, accurate 4 and 20 mA signals are
needed. The device is factory supplied calibrated,
and it is scaled to display 0-100.0 unless ordered
differently.
CAL >
If the device displays incorrect readings (more than
0.05% of range), it should be recalibrated. Before
doing that, ensure that the input signal is correct
(using a separate mA meter) and that the scaling
(Lo, Hi) is appropriate.
Enter configuration menu, select CAL and press ➤
key. Enter calibration password 112213,
▲▲▼▼▲★. “4_20” is displayed.
Feed a precise 4.000 mA signal to the device and
press ▼ key. Wait until the display reappears. Then
feed 20.000 mA and press ▲ key. Calibration values
are stored immediately and cannot be undone.
Finally exit to the configuration menu with ★ key.
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