Simex SRT-N118-XA User manual

Assisting the automation
industry since 1986
User manual
METER
SRT-N118-XA
•Firmware: v.6.00 or higher
•Input type: TC K/S/J/T/N/R/B/
•Wall mounting case IP 67
Read the user's manual carefully before starting to use the unit or software.
Producer reserves the right to implement changes without prior notice.
2014.12. 1 SRT-N118-XA_INSSXEN_v.2.09.004

User manual - METER SRT-N118-XA
CONTENTS
1. BASIC REQUIREMENTS AND USER SAFETY........................................................................................3
2. GENERAL CHARACTERISTICS................................................................................................................4
3. TECHNICAL DATA......................................................................................................................................5
4. DEVICE INSTALLATION............................................................................................................................7
4.1. UNPACKING.......................................................................................................................................7
4.2. ASSEMBLY........................................................................................................................................8
4.3. CONNECTION METHOD...................................................................................................................8
4.4. MAINTENANCE................................................................................................................................16
5. FRONT PANEL DESCRIPTION................................................................................................................17
6. PRINCIPLE OF OPERATION...................................................................................................................17
6.1. MEASUREMENT MODE..................................................................................................................17
6.2. DETECTION OF THE PEAK VALUES............................................................................................18
6.3. CONTROL OF THE RELAY OUTPUTS..........................................................................................19
6.3.1. O e threshold mode................................................................................................................20
6.3.2. Two thresholds mode..............................................................................................................21
7. DEVICE PROGRAMMING.........................................................................................................................22
7.1. PROGRAMMING MENU..................................................................................................................22
7.2. PARAMETERS EDITION.................................................................................................................23
7.2.1. Numeric parameters (digit cha ge mode)...............................................................................23
7.2.2. Numeric parameters (slide cha ge mode)..............................................................................23
7.2.3. Switch parameters (“LIST” type).............................................................................................24
7.3. MENU DESCRIPTION.....................................................................................................................24
7.3.1. “rEL1” me u.............................................................................................................................25
7.3.2. “i Pt” me u..............................................................................................................................27
7.3.3. ”OutP” me u............................................................................................................................28
7.3.4. ”bri” parameter.........................................................................................................................29
7.3.5. ”HOLd” me u...........................................................................................................................30
7.3.6. ”SECu” me u...........................................................................................................................30
7.3.7. ”rS” me u.................................................................................................................................31
7.3.8. ”Edit” parameter......................................................................................................................32
7.3.9. ”dEFS” parameter....................................................................................................................32
7.3.10. ”SErv” me u..........................................................................................................................32
7.4. MENU STRUCTURE........................................................................................................................33
8. THE ALARM LED......................................................................................................................................35
. CURRENT OUTPUT VALUE CALCULATION.........................................................................................35
10. THE MODBUS PROTOCOL HANDLING...............................................................................................35
10.1. LIST OF REGISTERS....................................................................................................................36
10.2. TRANSMISSION ERRORS DESCRIPTION..................................................................................38
10.3. EXAMPLES OF QUERY/ANSWER FRAMES...............................................................................39
11. DEFAULT AND USER'S SETTINGS LIST.............................................................................................41
2

User manual - METER SRT-N118-XA
Explanation of symbols used in the manual:
- This symbol de otes especially importa t guideli es co cer i g the i stallatio a d
operatio of the device. Not complyi g with the guideli es de oted by this symbol
may cause a accide t, damage or equipme t destructio .
IF THE DEVICE IS NOT USED ACCORDING TO THE MANUAL THE USER IS
RESPONSIBLE FOR POSSIBLE DAMAGES.
- This symbol de otes especially importa t characteristics of the u it.
Read a y i formatio regardi g this symbol carefully
1. BASIC REQUIREMENTS AND USER SAFETY
- The manufacturer is not responsible for any damages caused by
inappropriate installation, not maintaining the proper environmental
conditions and using the unit contrary to its assignment.
- Installation should be conducted by qualified personnel . During installation all
available safety requirements should be considered. The fitter is responsible for
executing the installation according to this manual, local safety and EMC
regulations.
- If the device is equipped with PE connector, it should be connected to PE wire.
Otherwise PE wire should be connected to GND connector.
- The unit must be properly set-up, according to the application. Incorrect
configuration can cause defective operation, which can lead to unit damage or
an accident.
- If in the case of a unit malfunction there is a risk of a serious threat to the
safety of people or property additional, independent systems and
solutions to prevent such a threat must be used.
- The unit uses dangerous voltage that can cause a lethal accident. The unit
must be switched off and disconnected from the power supply prior to
starting installation of troubleshooting (in the case of malfunction).
- Neighbouring and connected equipment must meet the appropriate standards
and regulations concerning safety and be equipped with adequate overvoltage
and interference filters.
- Do not attempt to disassemble, repair or modify the unit yourself. The unit
has no user serviceable parts. Defective units must be disconnected and
submitted for repairs at an authorized service centre.
3
i
!
!

User manual - METER SRT-N118-XA
- Do not use the unit in areas threatened with excessive shocks, vibrations, dust,
humidity, corrosive gasses and oils.
- Do not use the unit in areas where there is risk of explosions.
- Do not use the unit in areas with significant temperature variations, exposure to
condensation or ice.
- Do not use the unit in areas exposed to direct sunlight.
- Make sure that the ambient temperature (e.g. inside the control box) does not
exceed the recommended values. In such cases forced cooling of the unit must
be considered (e.g. by using a ventilator).
The unit is designed for operation in an industrial environment and must
not be used in a household environment or similar.
2. GENERAL CHARACTERISTICS
The RT-N118-XA meter is equipped with thermocouple input (K, S, J, T, N, R, B, E).
The measurement range depends on connected thermocouple type. Measurement is
linearised by the polynomial characteristics referred to particular thermocouples and
temperature of cold ends is compensated automatically. The device has additional
measurement range (-10÷90mV) mainly for diagnostics of measurement circuits. Being in this
range, unit displays direct voltage connected to its input (without compensation of cold ends).
The result is presented on 4-digit LED display. For every thermocouples result is displayed as
integer (no decimal point, e. g 1460) and for mV range with 2 digits after decimal points (with
resolution 0.01mV e. g. -1.2 ).
RT-N118-XA can be equipped with: two relay outputs, two OC type outputs, one relay
and one passive isolated current output or one OC type and one passive isolated current
output. Device RT-N118-XA is equipped with RS-485 / Modbus RTU communication
interface and 24V/100mA supply output for free use. The meter can be ordered in two power
supply versions.
The device has 4 buttons being used for main presets programming. To get high
protection level, the keyboard is mounted under transparent cover. To allow user to change
presets without opening the cover, an IR sensor is mounted. Remote controller keyboard is
equivalent to the device keyboard (Note, that remote controller is not a part of the RT-N118-
XA set – it is an additional equipment).
4
!
!

User manual - METER SRT-N118-XA
3. TECHNICAL DATA
Power supply voltage
(depending on version)
85...230...260V AC/DC; 50 ÷ 60 Hz (separated)
or 19...24...50V DC and 16...24... 5V AC (separated)
External fuse (required)
Power consumption
T - type, max. 2 A
max. 5 VA @ 85 ÷ 260V AC/DC
max. 5 VA @ 16V ÷ 5V AC
max. 5 W @ 19V ÷ 50V DC
Measurement input thermocouple type: K, S, J, T, N, R, B, E
Measurement range K: -200˚C ÷ +1 70˚C
S: -50˚C ÷ +1768˚C
J: -210˚C ÷ +1200˚C
T: -200˚C ÷ + 400˚C
N: -200˚C ÷ +1 00˚C
R: -50˚C ÷ +1768˚C
B: +250˚C ÷ +1820˚C
E: -200˚C ÷ +1000˚C
Voltage: -10mV ÷ 90mV
Measurement accuracy ± 0,1% @ 25°C; ± one digit
Accuracy of cold ends temperature
compensation
± 1˚C
Temperature stability 50 ppm / °C
Outputs
relay:
or OC-type:
passive, isolated current:
sensor power supply UO:
0, 1 or 2 NO, 1A/250V AC (cos ϕ = 1)
0, 1 or 2; 0mA / 0VDC / 100mW
0 or 1;
range max. 2.8 ÷ 24mA
supply voltage: Us = 9.5 ÷ 6V
load resistance 0...(Us – 9.5V) / 24mA [kΩ]
resolution: 12bits
isolation strength 560V DC
24V +5%, -10% / max. 100 mA, stabilized
ensor power supply output 24V +5%, -10% / max. 100 mA, stabilized
Relay output 0, 1 or 2 NO, 1A/250V AC (cos ϕ = 1)
OC-type output 0, 1 or 2; 0mA / 0VDC / 100mW
5

User manual - METER SRT-N118-XA
Active current output
(optional, for one relay or one
OC-type output version only)
range max. 0 ÷ 24 mA
Load resistance max. 700 Ω
Passive isolated current output
(optional, for one relay or one
OC-type output version only)
range max. 2.8 ÷ 24 mA
Supply voltage Us = 9.5 ÷ 6V
Load resistance max. (Us – 9.5V) / 24mA [kΩ]
Active voltage output
(optional, for one relay or one
OC-type output version only)
range max. 0 ÷ 11V
Load resistance min. 2000 Ω
Communication interface RS 485, 8N1 and 8N2, Modbus RTU, not separated
Baud rate 1200 bit/s ÷ 115200 bit/s
Display
(depending on version)
LED, 4 digit, 20mm height, red or
LED, 4 digit, 20mm height, green
Data memory non-volatile memory, EEPROM type
Protection level IP 67
Housing type
Housing material
Housing dimensions
without glands:
with glands:
wall mounted
ABS + fibreglass
110 x 80 x 67 mm
110 x 105 x 67 mm
Operating temperature 0°C do +50°C
or -20°C to +50°C
Storage temperature -10°C do +70°C
or -20°C to +70°C
Humidity
Altitude
5 to 90% no condensation
up to 2000 meters above sea level
Screws tightening max. torque 0,5 Nm
Max. connection leads cross section mm2 (for connectors 1÷6) or
2 mm2 (for connectors 7÷16)
6

User manual - METER SRT-N118-XA
Safety requirements according to: PN-EN 61010-1
installation category: II
pollution degree: 2
voltage in relation to ground: 00V AC
insulation resistance: >20MΩ
insulation strength between power supply and
input/output terminal: 1min. @ 2 00V
insulation strength between relays terminal:
1min. @ 1 50V
EMC according to: PN-EN 61 26-1
This is a class A unit. In a residential or a similar area it can cause radio
frequency interference. In such cases the user can be requested to use
appropriate preventive measures.
4. DEVICE INSTALLATION
The unit has been designed and manufactured in a way assuring a high level of user
safety and resistance to interference occurring in a typical industrial environment. In order to
take full advantage of these characteristics installation of the unit must be conducted correctly
and according to the local regulations.
- Read the basic safety requirements on page prior to starting the installation.
- Ensure that the power supply network voltage corresponds to the nominal
voltage stated on the unit’s identification label.
- The load must correspond to the requirements listed in the technical data.
- All installation works must be conducted with a disconnected power supply.
- Protecting the power supply connections against unauthorized persons must be
taken into consideration.
4.1. UNPACKING
After removing the unit from the protective packaging, check for transportation damage. Any
transportation damage must be immediately reported to the carrier. Also, write down the unit
serial number located on the housing and report the damage to the manufacturer.
Attached with the unit please find:
- user’s manual,
- warranty,
7
!
!

User manual - METER SRT-N118-XA
4.2. ASSEMBLY
- Disconnect the power supply prior to starting assembly.
- Check the connections are wired correctly prior to switching the unit on.
To install device on the wall, a pinholes should be made. Figure 4.1 presents
dimensions of the device and distances between holes. The back side of the device
has four mounting holes. This part of the case should be mounted to a wall by
screws.
Figure 4.1. Device a d assembly dime sio s
4.3. CONNECTION METHOD
Caution
- Installation should be conducted by qualified personnel . During installation all
available safety requirements should be considered. The fitter is responsible for
executing the installation according to this manual, local safety and EMC
regulations.
- The unit is not equipped with an internal fuse or power supply circuit breaker.
Because of this an external time-delay cut-out fuse with a small nominal current
value must be used (recommended bipolar, max. 2A) and a power supply circuit-
breaker located near the unit. In the case of using a monopolar fuse it must be
mounted on the phase cable (L).
- The power supply network cable diameter must be selected in such a way that in
the case of a short circuit of the cable from the side of the unit the cable shall be
protected against destruction with an electrical installation fuse.
- Wiring must meet appropriate standards and local regulations and laws.
8
!
!
!
110 mm
80 mm
67 mm
90 mm
60 mm
ø8.4
ø4.4

User manual - METER SRT-N118-XA
- In order to secure against accidental short circuit the connection cables must be
terminated with appropriate insulated cable tips.
- Tighten the clamping screws. The recommended tightening torque is 0.5 Nm.
Loose screws can cause fire or defective operation. Over tightening can lead to
damaging the connections inside the units and breaking the thread.
- In the case of the unit being fitted with separable clamps they should be inserted
into appropriate connectors in the unit, even if they are not used for any
connections.
- Unused terminals (marked as n.c.) must not be used for connecting any
connecting cables (e.g. as bridges), because this can cause damage to the
equipment or electric shock.
- If the unit is equipped with housing, covers and sealing to, protecting against
water intrusion, pay special attention to their correct tightening or clamping. In the
case of any doubt consider using additional preventive measures (covers, roofing,
seals, etc.). Carelessly executed assembly can increase the risk of electric shock.
- After the installation is completed do not touch the unit’s connections when it is
switched on, because it carries the risk of electrical shock.
Due to possible significant interference in industrial installations appropriate measures
assuring correct operation of the unit must be applied. To avoid the unit of improper
indications keep recommendations listed below.
–Avoid running signal cables and transmission cables together with power supply cables
and cables controlling inductive loads (e.g. contactors). Such cables should cross at
a right angle.
–Contactor coils and inductive loads should be equipped with interference protection
systems, e.g. RC-type.
–Use of screened signal cables is recommended. Signal cable screens should be
connected to the earthing only at one of the ends of the screened cable.
–In the case of magnetically induced interference the use of twisted pair of signal cables is
recommended. Twisted pair (best if shielded) must be used with RS-485 serial
transmission connections.
–In the case of measurement or control signals are longer than 0m or go outside of the
building then additional safety circuits are required.
–In the case of interference from the power supply side the use of appropriate interference
filters is recommended. Bear in mind that the connection between the filter and the unit
should be as short as possible and the metal housing of the filter must be connected to
the earth with the largest possible surface. The cables connected to the filter output must
not be run with cables with interference (e.g. circuits controlling relays or contactors).
9
!

User manual - METER SRT-N118-XA
Connection of the power supply, and the measurement and controlling signals should be
made by clamping connectors mounted inside the housing.
a) b)
Figure 4.2. Recomme ded dime sio s of cable strippi g
a) for big co ectors (1 to 6), b) for small co ectors (7 to 16)
Figure 4.3. Method of co ecti g cables to the clamping co ectors
All connections must be made while power supply is disconnected !
Figure 4.4. Termi als descriptio (relay outputs)
10
!
5 mm
max. 1.6 mm
6 mm
max. 2 mm
+ Uo -
n.c.
R1 R2
GND
DATA+
DATA-
R - 485
(option) (option)
Power supply
(depending on version)
24V (+5%, -10%)
Imax = 100 mA
PE
TC
GND
GND
-
+
34 12
141516 56 12 11 10 9 8 713

User manual - METER SRT-N118-XA
Figure 4.5. Termi als descriptio (OC-type outputs)
Figure 4.6. Termi als descriptio (relay a d active curre t outputs)
Figure 4.7. Termi als descriptio (OC-type a d active curre t outputs)
11
+ Uo -
n.c.
GND
DATA+
DATA-
R - 485
24V (+5%, -10%)
Imax = 100 mA
PE
OC2
- +
(option)
OC1
- +
(option)
OC1, OC2: Umax = 0V DC,
Imax = 0mA, Pmax = 100mW
Power supply
(depending on version)
TC
GND
GND
-
+
34 12
141516 56 12 11 10 9 8 713
+ Uo -
n.c.
R1
GND
DATA+
DATA-
R - 485
(option)
24V (+5%, -10%)
Imax = 100 mA
PE
Power supply
(depending on version)
TC
GND
GND
-
+
ACTIVE
current output
(option)
- +
12
141516 56 12 11 10 9 8 713 34
+ Uo -
n.c.
GND
DATA+
DATA-
R - 485
24V (+5%, -10%)
Imax = 100 mA
PE
OC1
- +
(option)
OC1: Umax = 0V DC,
Imax = 0mA, Pmax = 100mW
Power supply
(depending on version)
TC
GND
GND
-
+
ACTIVE
current output
(option)
- +
12
141516 56 12 11 10 9 8 713 34

User manual - METER SRT-N118-XA
Figure 4.8. Termi als descriptio (relay a d passive curre t outputs)
Figure 4.9. Termi als descriptio (OC-type a d passive curre t outputs)
12
+ Uo -
n.c.
R1
GND
DATA+
DATA-
R - 485
(option)
24V (+5%, -10%)
Imax = 100 mA
PE
Passive, isolated
current output
4÷20mA
(option)
Power supply
(depending on version)
TC
GND
GND
-
+
34 12
141516 56 12 11 10 9 8 713
+ Uo -
n.c.
GND
DATA+
DATA-
R - 485
24V (+5%, -10%)
Imax = 100 mA
PE
OC1
- +
(option)
OC1: Umax = 0V DC,
Imax = 0mA, Pmax = 100mW
Power supply
(depending on version)
Passive, isolated
current output
4÷20mA
(option)
TC
GND
GND
-
+
34 12
141516 56 12 11 10 9 8 713

User manual - METER SRT-N118-XA
Figure 4.10. Termi als descriptio (relay a d active voltage outputs)
Figure 4.11. Termi als descriptio (OC-type a d active voltage outputs)
13
+ Uo -
n.c.
R1
GND
DATA+
DATA-
R - 485
(option)
24V (+5%, -10%)
Imax = 100 mA
PE
Power supply
(depending on version)
TC
GND
GND
-
+
ACTIVE
voltage output
(option)
- +
12
141516 56 12 11 10 9 8 713 34
+ Uo -
n.c.
GND
DATA+
DATA-
R - 485
24V (+5%, -10%)
Imax = 100 mA
PE
OC1
- +
(option)
OC1: Umax = 0V DC,
Imax = 0mA, Pmax = 100mW
Power supply
(depending on version)
TC
GND
GND
-
+
ACTIVE
voltage output
(option)
- +
12
141516 56 12 11 10 9 8 713 34

User manual - METER SRT-N118-XA
Depe di g o versio :
85...230...260V AC/DC; 50 ÷ 60 Hz or
19...24...50V DC a d 16...24...35V AC
Figure 4.12. Co ectio of power supply a d relays
Contacts of relay outputs are not equipped with spark suppressors. While use
the relay outputs for switching of inductive loads (coils, contactors, power
relays, electromagnets, motors etc.) it is required to use additional
suppression circuit (typically capacitor 47nF/ min. 250VAC in series with
100R/5W resistor), connected in parallel to relay terminals or (better) directly
on the load. In consequence of using the suppression circuit, the level of
generated electromagnetic disturbances is lower, and the life of relay contacts
rises.
a) b)
Figure 4.13. Examples of suppressio circuit co ectio :
a) to relay termi als; b) to the i ductive load
14
!
!
N
6 5 6 5
LL
N
!
FU E
R1 R2
5 4 36
N L
FU E
N L
12

User manual - METER SRT-N118-XA
Figure 4.14. Example of OC-type outputs co ectio
Figure 4.15. Example of active curre t outputs co ectio
(for device with active curre t output o ly)
Figure 4.16. Example of passive curre t outputs co ectio
(for device with passive curre t output o ly)
15
6 58 7
+ - - +
OC1Uo
- +
voltage input
24V
Logic controller
6 58 7
R
2k2 LED 10 mA
+ -
Uo OC1
- +
+
Current input
0-20 mA
-
Logic controller
4 3
- +
ACTIVE
Current output
4 3
8 7
PA IVE
Current output
Uo
+ -
Isolation loss
!
+
Current input
4-20mA
-
Logic controller

User manual - METER SRT-N118-XA
Figure 4.17. Example of active voltage outputs co ectio
(for device with active voltage output o ly)
4.4. MAINTENANCE
The unit does not have any internal replaceable or adjustable components available to
the user. Pay attention to the ambient temperature in the room where the unit is operating.
Excessively high temperatures cause faster ageing of the internal components and shorten the
fault-free time of the unit's operation.
In cases where the unit gets dirty do not clean with solvents. For cleaning use warm water with
small amount of detergent or in the case of more significant contamination ethyl or isopropyl
alcohol.
Using any other agents can cause permanent damage to the housing.
Product marked with this symbol should not be placed in municipal waste. Please
check local regulations for disposal of electronic products.
16
!
+
voltage input
0 - 10V
-
Logic controller
4 3
- +
ACTIVE
voltage output

User manual - METER SRT-N118-XA
5. FRONT PANEL DESCRIPTION
Symbols and functions of push-buttons:
Symbol used in the manual: [E C/MENU]
Functions:
• Enter to main menu ( press and hold by at least 2 sec.)
• Exit the current level and Enter to previous menu (or measure mode)
• Cancel the changes made in parameter being edited
Symbol used in the manual: [ENTER]
Functions :
• Start to edit the parameter
• Enter to the sub-menu,
• Confirmation of changes made in parameter being edited
Symbol used in the manual: [^] [v]
Functions :
• Change of the present menu,
• Modification of the parameter value,
• Change of the display mode.
6. PRINCIPLE OF OPERATION
After turning the power supply on, device ID and software version are showed on the
display, next the controller goes to the measurement mode.
6.1. MEASUREMENT MODE
In the measure mode, the measurement results, are displayed on the display. If the result
of measurement exceeds the permissible measurement range, warning ”-Hi-” or ”-Lo-” is
displayed rather than calculated result, depends on exceeded value.
In the measurement mode user can check main thresholds values. After pressing [^] or
[v] button, name of the threshold (e.g. ”rEL1”) and his value will be displayed on the display
in alternating mode. If [^] or [v] will be pressed in 5 sec again, the next threshold will be
displayed, else the device comes back to the measurement mode. If a free access is enabled
17
MENU
E C
ENTER
MENU
E C ENTER
AL R1 R2
i frared
receiver
alarm LED i dicator (AL)Thresholds exceedi g
LED i dicators (R)
display
programmi g pushbutto s

User manual - METER SRT-N118-XA
(see description of ”SECu” menu), user can change the value of particular threshold pressing
button [ENTER] (see: PARAMETERS EDITION).
All accessible parameters can be changed by entering the menu (see: DEVICE
PROGRAMMING). Use the local keyboard or the remote controller to do it. (Note: all
parameters can be remote changed via RS-485 interface).
Configuration of the device (via menu or RS-485 interface) does not stop
measures.
6.2. DETECTION OF THE PEAK VALUES
The RT-N118-XA controller is equipped with peaks detection function. It can detect a
peaks of the input signal and display their values. Presets connected with this function are
placed in ”HOLd” menu (see description of ”HOLd” menu). The detection of the peak can be
done if the measured signal raises and drops of value at least equal to parameter ”PEA”.
Detected peaks are displayed during the time defined by parameter ”timE”. If a new peak will
be detected while one is displayed, this new peak will be displayed and display time counter
will be cleared (Figure 6.1). If no peaks are detected while time ”timE” elapses, device starts
to show the current value of input signal again. If „Hdi ”=”HOLD” then setting parameter
"timE"=0.0 causes holding peak value until [E C] button is pressed. If „Hdi ”=”rEAL” then
value "timE"=0.0 means no holding. Displaying peak value is signalized by flashing most right
decimal point.
The relays/LEDs and the current output can be controlled depend on the current value of
input signal or the peak value (see ”HOLd” menu).
Figure 6.1. Process of peaks detectio
18
”timE”
measure
time
”timE”
”PEA”
”PEA”
real measurement result
display value
i

User manual - METER SRT-N118-XA
6.3. CONTROL OF THE RELAY OUTPUTS
The control of the object (measured signal) is realized via relay outputs. Front panel
LEDs named „R” indicates the state of particular relay output.
If device is not equipped with one or more relay outputs, menus refer to this relays
are available, but apply to LED indicators only. In such case LEDs indicates
exceeding of particular thresholds.
Modes of the control can be changed depend on the values of parameters “ EtP”, “ Et2”,
“HY t”, “modE”, “t on”, “toFF”, “unit” and “AL”. Depend on “modE” parameter, relays
can be not used or controlled over one or two thresholds values.
If one threshold is used (Figure 6.2) the relay can be turned on (“modE” = ”on”) or off
(“modE” = ”oFF”) when the input signal value is contained in zone A. If two thresholds are
used (Figure 6. ) the relay will be turned on when value of input signal is contained in zone A
(“modE” = ”in”) or zone B (“modE” = ”out”) and turned off if the signal is contained in the
second one.
Figure 6.2. O e threshold co trol of the relay/LED outputs
Figure 6.3. Two threshold co trol of the relay/LED outputs
The relay outputs and LEDs (named R) can be controlled depend on both - the
current value and the peak value (when peak detection is active) of the input signal.
19
zone A
zone B
measure
”SEtP” parameter
”HYSt” parameter
state of
relay/LED
zone B
zone A
zone B
measure
”SEtP” or ”SEt2” parameter
”HYSt” parameter
state of
relay/LED
i
i

User manual - METER SRT-N118-XA
6.3.1. One threshold mode
Figure 6.4 presents the principle of relay outputs operation for one threshold mode, and
an example values of other parameters.
Description:
A, B, C, D - points where measured signal exceeds border values (expected value ± allowed deviation)
BON ,BOFF ,DON ,DOFF - relays state changes moments: (for “t on” > 0, “toFF” > 0)
tA , tB , tC , tD- time periods while input signal is in zone A or zone B
Figure 6.4. Pri ciple of LED/relay output operatio for o e threshold mode
Parameter “ EtP” sets a threshold of the relay, and parameter “HY t” sets a
hysteresis of the relay (Figure 6.4 a). The relay can change his state only when input value
exceeds (over or under) border value and tA ,tB ,tC ,tD times (Figure 6.4) are bigger than the
time defined by parameters “t on”, “toFF” and “unit”. Border values means values equal
threshold+hysteresis and threshold-hysteresis respectively.
If “t on” and “toFF” parameters are set to “0”, then the relay state will be changed
as soon as input value exceeds any of the border values (see points A and C, Figure 6.4 a,
b, c).
If values of “t on” or/and “toFF” are positive, then relay state will be turned on if the
input value exceeds the border values and stay bigger (or lower) during at least
“t on” (see points BON, DON, Figure 6.4 a, d, e). Similarly, the relay will be turned off if time
“toFF” elapse since the input signal value exceeds any of the border values (see points
BOFF, DOFF, Figure 6.4 a, d, e).
If tA ,tB ,tC or tD (when input signal stay in zone A or zone B) are lower than parameters
“t on” or “toFF”, the relay will not change his state (see points A and C, Figure 6.4 a, d, e).
20
“ EtP” parameter
(expected signal value)
“HY t” parameter
(allowed signal
deviation)
measured
signal
displayed value
time
time
time
AB
CD
relay state
(modE = on
t on = 0
toFF = 0)
relay state
(modE = on
t on > 0
toFF > 0)
tAtBtCtD
BON
DOFF
relay state
(modE = oFF
t on = 0
toFF = 0)
relay state
(modE = oFF
t on > 0
toFF > 0)
“toFF”
parameter
“t on”
parameter
BOFF
DON
time
time
closed
open
a)
b)
c)
d)
e)
open
closed
open
open
closed
closed
“t on”
parameter
“toFF”
parameter
zone A
zone B