Czaki EMT-200 User manual

MICROPROCESSOR CONTROLLED TEMPERATURE METER
EMT-200
OPERATING MANUAL
ul. 19 Kwietnia 58
05-090 Raszyn Rybie
tel. [phone]
fax. [phone]
www.czaki.pl
[email protected]

Contents
1. Meter features ..............................................................3
2. Display and keyboard...................................................4
2.1. Description of display functions ..............................5
2.2. Using keyboard.......................................................5
3. Programming mode......................................................6
4. Menu AL_1 or AL_2..................................................... 8
4.1. Setting the alarm mode.......................................... 8
4.2. Setting alarm thresholds.........................................9
5. MEMO menu................................................................ 9
5.1. Cyclic readout period..............................................9
5.2. Printing results......................................................10
5.3 Recording results...................................................10
6. SYST menu................................................................ 11
6.1. Protection.............................................................11
6.2. Reset.....................................................................11
7. TEPR menu................................................................12
7.1 Sensor type............................................................12
7.2. Resolution of measurements................................12
7.3. Characteristic offset..............................................13
8. R232 menu.................................................................13
8.1. Meter address.......................................................14
8.2. Transmission rate................................................. 14
8.3. Parity check.......................................................... 15
9. Programming the meter through the RS232 port....... 15
9.1. Data format...........................................................15
9.2. Parameter symbols...............................................16
10. Making electrical connections.................................. 17
10.1. Power supply...................................................... 17
10.2. Sensor................................................................ 18
10.3. Alarm circuits...................................................... 18
10.4. Serial port........................................................... 19
11. Remarks concerning operational use of the meter...19
12. Technical data.......................................................... 20

1. Meter features
The EMT 200 is an universal microprocessor controlled temperature
meter. Its main features are:
!input adjusted to most commonly used types of thermocouples and
thermistors
!two alarms controlling independent relays, programmable in five
modes
!bi-directional RS232 serial port, isolated, making possible remote
readout and storage of the most important parameters
!memory of 300 measurements
!meter parameters and configuration set through a keyboard or
serial port
!two four digit LED displays and three additional status lights
3

2. Display and keyboard
Double display and three key keyboard are placed on the front panel
of the meter. The panel is presented in the picture below:
4
1
2
3 4 5 8
7 6
1 Main display
2 Auxiliary display
3 „ALARM 1” LED
4 „ALARM 2” LED
5 „TRANSMISSION” LED
6 „p” key
7 „u” key
8 „tu” key

2.1.Description of display functions
Switching on the meter results in displaying the „LOAD” message on
the main display. It means starting the meter.
In the basic mode the display presents temperature in
degrees Centigrade. The unit of measurements is shown on the
auxiliary display..
In the programming mode the main display shows
consecutive positions of menu or parameter names, and the
auxiliary display presents their respective values..
If the LED „ALARM 1” or / and „ALARM 2” comes on it
means that the measured temperature has entered the
programmed alarm range.
While modifying (meter) parameters the value indicated in
the active field of the auxiliary display is also changed. The
active field is distinguished by blinking of selected position.
If the main display shows the „ERR” message it means that
the processing range has been exceeded, a sensor has been
incorrectly connected, or the sensor previously programmed
differs from the sensor actually connected.
2.2.Using keyboard
The meter is equipped with the three key membrane keyboard..
The key „p” is used for changing the value of the active
(blinking) digit. It is also intended for entering the parameter
programming mode and for leaving this mode.
The key „u” makes possible changing the menu position
and changing the active digit.
The key „tu” is intended for confirming the selected menu
position, or for confirming the (selected) value.
5

3.Programming mode
The programming mode is entered by pressing „p” for approx. 3
seconds.
It results in the message „AL_1” appearing on the main display.
Repetitive depressing of „u” scrolls consecutive menu positions.
Finding the appropriate menu position is confirmed by pressing
„tu”.
Depressing „p” causes entering the higher menu level. The same at
the highest menu level results in leaving the programming mode and
entering the temperature measurement mode.
If the user does not change any parameters the programming mode
will go off automatically after approx. 90 seconds.
At the parameter change procedure the key „p” changes the value
under the cursor, and the key „u” shifts the cursor position (if possible).
6
Changing parametr value:
Using „u” activate the digit to be changed on the auxiliary display ;
Using „p” set the new value;
Repeat this procedure till the required value is set completely;
Introduced changes confirm by „tu”. It causes memorizing the
parameter value.
ATTENTION: If the entered value exceeds premissible limits then on
the auxiliary display the „ERR” message appears for a while, after that
the previous value (before modification) is continously displayed.

600,1200,2400
4800,9600
R232
Factory
settings
Admissible values
Displayed
symbol
Parameter description
item 2
0, 1, 2, 3, 4, 5
TAL
TAL
P1
P1
P2
P2
RSCT
TPRI
TMEM
PROT
RESE
SNSR
TPOI
TOFF
ADR
BAUD
PARI
0
0
0
0
0
0
0
1
K
2
4
10
10
100
0.0
2400
NONE
1...240
AL_2
MEMO
SYST
-9.9...+9,9
1...99
NONE, ODD, EVEN
Pt,Ni,T,J,K,R,S,B,N
0, 1, 2
0, 1, 2
0, 1, 2
0, 1
0, 1
-100...+1800
-100...+1800
-100...+1800
AL_1
-100...+1800
TEPR
0, 1, 2, 3, 4, 5
alarm mode 1
item 1
alarm mode 2
item 1
item 2
readout period
results readout
results recording
protection
reset
sensor type
resolution
offset
address
rate
parity
7
ATTENTION: Parameters in the shaded fields are accessible if the
„p” key has been depressed at the moment of switching
on the meter.

4.Menu AL_1 or AL_2
Programming alarms consists in setting their work modes and values
of threshold temperatures.
Enter the programming mode by depressing „p” for approx. three
seconds.
Using „u” select from the menu position „AL_1” or „AL_2”, confirm
by „tu”.
4.1. Setting the alarm mode
In the alarm programming mode using „u” select „TAL ” position.
The auxiliary display will show the current alarm mode. To change
the mode depress „tu” (the digit on the auxiliary display starts
blinking).
Using „p” set the required alarm mode.
!Mode 0alarm is off,
!Mode 1alarm comes on when the current temperature exceeds the
first alarm threshold,
!Mode 2alarm comes on when the current temperature drops below
the first alarm threshold,
!Mode 3alarm comes on when the current temperature exceeds the
first alarm threshold, and at the same time is lower than the second
alarm threshold.
!Mode 4alarm comes on when the current temperature drops below
the first alarm threshold or exceeds the second alarm threshold.
!Mode 5alarm comes on when the current temperature exceeds the
second alarm threshold, and comes off when temperature drops below
the first alarm threshold (hysteresis). If a power outage appears in this
mode the meter memorises states of relays and the last temperature,
This makes possible correct alarm operation after re-powering.
Alarm modes are presented in a graphical form on page 22.
8

After making changes confirm them by depressing „tu” („TAL ”
message will start blinking again).
Depressing „u” we can reach the next position of menu.
Depressing „p” we leave „TAL ”, pressing again „ p” we go out of
the programming mode and enter the temperature measurement mode.
4.2. Setting alarm thresholds
Using „u” select position „P1” or „P2” in the alarm programming mode.
The auxiliary display will show the current value of the alarm
threshold temperature. To change its value depress „ tu”, (the first
digit of the auxiliary display will start blinking).
Using „p” set the required value, then using „u” go to the next digit.
A parameter can assume values from 100 to +1800.
After making changes confirm them by „tu” ( „P1” or „P2” will start
blinking again).
Depressing „p” we come out of „P1” or „P2”, depressing again „p”
we leave the programming mode and enter the temperature
measurement mode.
ATTENTION: Take care to set the value of the first threshold
(„P1”) below the value of the second threshold („P2”).
Otherwise alarms may function improperly.
5. MEMO menu
The meter is equipped with the RS232 serial port. It enables easy
connection between the meter and the computer for bi-directional data
transmission, or between the meter and the printer for creating a simple
temperature recorder.
The serial port makes possible:
- Non-recurrent or periodical readout of measured temperature
- Alarm parameter readout,
- Alarm parameters recording,
- Adjustment of data transmission rate
9

The keyboard makes possible triggering the cyclic temperature
readout through the port (this option is used for the meter - printer
arrangement), and setting the meter address.
The parameter programming mode is entered by selecting the
„MEMO” position from menu, and confirming it by „tu”.
5.1. Cyclic readout period
Determining the period between the consecutive recordings of data,
or consecutive data transmissions to the RS232 port.
In the programming mode „MEMO” select the position „RSCT” by „
u”. The auxiliary display indicates the current value in seconds. To
change it depress „tu” (the digit on the auxiliary display will start
blinking). Using „p” set the required value.
The parameter can assume values from 1to 240.
Changes should be confirmed by „tu” (the message „RSCT” would
start blinking again).
Depressing „u” we can reach the next position of menu.
Depressing „p” we come out of „RSCT”, depressing „p” again we
leave the programming mode and enter temperature measurement
mode.
5.2. Printing results
Determining whether measurement results should be sent to the
RS232 port.
Using „u”select the position „TPRI” in the programming mode
„MEMO”.
The auxiliary display indicates the current value of the parameter. To
change it depress „tu” (the digit on the auxiliary display will start
blinking).
Using „p” set the required value.
The parameter can assume the following values:
!0results are not sent to the RS232 port,
!1sends measured temperature with frequency determined by
„RSCT”(see item. 5.1).
!2 sends measurement data from the memory (this operation does
not erase the results). 10

Completed changes should be confirmed by „tu” (Factory settings will
be recorded in the meter memory).
Depressing „u” we can go to the next menu position.
Depressing „p” we leave „RSCT”, depressing „p” again we come
out of the programming mode and we enter the temperature
measurement mode.
5.3. Recording results
Determining whether measurement results should be recorded in the
meter memory.
Using „u” select „TMEM” position in the programming „MEMO”
mode.
The auxiliary display indicates the current value of the parameter. To
change it depress „tu” (the digit on the auxiliary display will start
blinking).
Using „ p” set the required value.
The parameter can assume the following values:
!0results are not recorded,
!1 storing in memory consecutive 300 measurements with frequency
determined by „RSCT” (see item 5.1),
!2 storing in memory consecutive measurements. After memory
overflow measurements are shifted “upwards” (the first position is
deleted, and the (latest) result is recorded in the last position.
ATTENTION : When the parameter value is 1the first position of the
auxiliary display presents symbol Ï. It means that recording results in
memory is in progress.
The symbol comes off after recording 300 (results of) measurements.
Completed changes should be confirmed by „tu” („TMEM”
message would start blinking again). Depressing „p” we come out of
„TMEM”, depressing „ p” again we leave the programming mode and
enter the temperature measurement mode.
11

6. SYST menu
The meter is equipped with parameter values protection against
accidental changes or changes made by unauthorised persons.
Restoring factory settings is also possible.
Enter the programming mode by depressing „p” for approx. 3
seconds . Select from menu the “SYST” position using „u”, confirm
by „ ”.
6.1. Protection
Setting the protection level.
In the SYST” programming mode use „u” to select „PROT”.
The auxiliary display will show the current parameter value. To
change it depress „tu” (the digit in the auxiliary display will start
blinking).
Using „p” set the required protection level.
The parameter can assume the following values:
!0protection off,
!1 protection covers all parameters (excluding protection itself),
!2 protection covers all parameters (excluding protection itself).
Removing protection is possible if the key „p” is depressed at the
moment of switching on the meter.
Completed changes should be confirmed by „tu” („PROT”
message would start blinking again).
By depressing „u” we can enter the next position of menu.
Depressing „ ” we leave „PROT”, depressing „ ” again we come out
of the programming mode and enter the temperature measurement
mode.
6.2. Reset
Restoring factory parameter settings.
Switch on the meter depressing „p” at the same time.
Enter the programming mode by depressing „p” for approx. for 3
seconds. Select from menu the “SYST” position using „u”, confirm by
„tu”.
12

Using „u” select „RESE” position.
The auxiliary display will show the current parameter value. To
change it depress „tu” (the digit in the auxiliary display will start
blinking).
Using „p” set the required value.
The parameter can assume the following values:
!0function off,
!1 depressing „tu” will restore factory settings.
Confirm completed changes by depressing „tu” (factory settings
will be entered to the meter memory)).
Depressing „p” we come out of „SYST”.
Switch off the meter.
7. TEPR menu
7.1. Sensor type
Selection of the type of sensor connected to the meter.
Switch on the meter depressing „p” at the same time.
Enter the programming mode by depressing „p” for approx. 3
seconds. Select from menu the „TEPR” position using „u”, confirm by
„tu”.
Using „u” select „SNSR” position.
The auxiliary display will show the sensor symbol. To change it
depress „tu” (the sensor symbol in the auxiliary display will start
blinking).
Using „u” set the required sensor type.
The parameter can assume the following values (corresponding
symbols that will be displayed are shown in square brackets):
!thermocouples T [ ], J [ ], K [ ], R [ ], S [ ], B [ ], N [ ]
!thermistors Pt100 [ ], Ni100 [ ]
Confirm completed changes by depressing „tu” („SNSR” will start
blinking again).
Depressing „p” we come out of „SNSR”.
Switch off the meter.
13

7.2. Resolution of measurements
Determining the method of presenting results on the display.
Enter the programming mode by depressing „p” for approx. for 3
seconds. Select from menu the „TEPR” position using „u”, confirm by
„tu”.
Using „u” select „TPOI” position.
The auxiliary display will show the current parameter value. To change
it depress „ ” (the digit in the auxiliary display will start blinking).
Using „p” set the required value.
The parameter can assume the following values:
!0results displayed in 0.1°C resolution,
!1 results rounded to full degrees.
Completed changes should be confirmed „tu” („TPOI” would start
blinking again).
Depressing „p” we leave z „TPOI”, depressing „p” again we come out
of the programming mode and enter the temperature measurement mode.
7.3. Characteristic offset
This parameter makes possible compensating resistance of cables
connecting the meter and the thermistor, or to offset the thermocouple
characteristic in case lower grade thermocouple sensor is used. Appropriate
(different from zero) offset should be introduced to compensate a constant
difference between the actual temperature of the sensor and the temperature
indicated by the meter.
Switch on the meter depressing „p” at the same time.
Enter the programming mode by depressing „p” for approx. 3
seconds. Using „u”select the „TOFF” position from menu.
The auxiliary display will show the current value of the parameter. To
change it depress „tu” (the first digit of the auxiliary display will start
blinking).
Using „p” set the required value, then depressing „u” go to the next
digit.
The parameter can assume values from 9.9 to +9.9.
Completed changes should be confirmed by „tu” („TOFF” message
would start blinking again).
Depressing „p” we leave „TOFF”.
Switch off the meter.
14

8. R232 menu
These parameters make possible adequate configuration of the
RS232 port for co-operation between the meter and a computer or a
printer. Data transmitted between the computer and the meter are in
ASCII code. They consist of 8 data bits and one stop bit.
Switch on the meter depressing „p” at the same time.
Enter the programming mode by depressing „p” for approx. 3
seconds. Select from menu the „R232” position using „u”, confirm by
„tu”.
8.1. Meter address
A meter address is intended for selecting data directed to a particular
meter by the co-operating computer. Different address values are required
in case few meters are connected to one computer (it concerns meters
equipped with the RS485 interface).
Using „u” select „ADR in the programming mode „R232”” .
The current value of the parameter will be presented on the auxiliary
display. To change this value depress „tu” (the first digit of the auxiliary
display will start blinking). Using „p” set the required value, depressing
„u” go to the next digit.
The parameter can assume values from 1to 99.
Completed changes should be confirmed by „tu” („ADR”) message
would start blinking again).
Depressing „p” we leave „ADR”.
Switch off the meter.
8.2. Transmission rate
Using „u” key select the position„BAUD” In the programming mode
„R232”.
The current value of the parameter will be presented on the auxiliary
display. To change this value depress „tu” (the first digit of the auxiliary
display will start blinking). Using „u” set the required value.
The parameter can assume the following values: 600, 1200, 2400,
4800, 9600
15

Completed changes should be confirmed by depressing „tu”
(„BAUD” message would start blinking again).
Depressing „p” we leave „BAUD”.
Switch off the meter.
8.3. Parity check
In the programming mode „R232” select „PARI” using „ u” key.
The current value of the parameter will be presented on the auxiliary
display. To change this value depress „tu” (the parameter value will start
blinking on the auxiliary display).
Using „u” key set the required value.
The parameter can assume the following values: NONE,ODD, EVEN.
Completed changes should be confirmed by „tu” („PARI” message
would start blinking again)
Depressing „p” we leave „PARI”.
Switch off the meter.
9. Programming the meter through the RS232 port
The serial port makes possible remote programming of selected
parameters: modes and alarm thresholds, the mode and period of the cyclic
temperature readout, transmission rate, measurements recording mode,
and single temperature readout.
The programmed parameter value is always assigned to one particular
meter provided with a specific address.
Sending any data from the computer to the port interrupts the cyclic
readout of results
16

recording instruction or parameter
temperature readout
enquiry for temperature
or parameter value
address (eg. 01) address (eg. 01)
instruction instruction
sign (+ or -)
sign (+ or -)
sign (?)
<CR>
value
value
<CR>
<CR>
<LF>
17
9.1 Data format
parameter value readout
sign (+ or -)
value
<CR>
<LF>
9.2. Parameter symbols
The meter accepts the following symbols of instructions:
!Aor aalarm mode 1,
!Bor bthreshold 1 of the alarm 1,
!Cor cthreshold 2 of the alarm 1,
!Dor dalarm mode 2,
!Eor ethreshold 1 of the alarm 2,
!For fthreshold 2 of the alarm 2,
!Por pprinting results,
0does not print
1prints results with the frequency determined by RSCT (see item 5.1)
2prints results stored in the memory

!Ror rcyclic readout period,
!Sor ssetting transmission rate,
0600 bps
11 200 bps
22 400 bps
34 800 bps
49 600 bps
!Tor ttemperature value (enquiry only),
!Uor urecording results in the memory,
0results are not recorded
1records in the memory 300 measurements and stops recording
2records in the memory consecutive results of measurements
10. Making electrical connections
Functions of electrical terminals and the exemplary electrical wiring
diagram are presented in the picture below.
18
1
– +
~ 220V AC
Thermocouple
Pt, Ni
2 3 45 6 7 8 9 10 11 12
23 2413 14 15 16 17 18 19 20 21 22
RS232
OUT (TxD)
IN(RxD)
COM (GND)

10.1 Power supply
Due to safety reasons the power supply cables should be fixed to
terminals as the last ones, and should be disconnected from the power
network prior to this operation.
10.2. Sensor
A thermocouple sensor should be connected to the meter through a
compensatory cable suitable for the specific sensor type. Otherwise,
varying in time compensation error will appear and it can reach significant
values. The grade of the used thermocouple influences also the precision
of temperature measurements. It especially concerns the range of higher
temperatures.
In case of using a thermoresisistor sensor it is important to assure
using the largest possible cross-section of conductors connecting the
sensor to the meter. In the 3-wire method the sensor should be connected
to the meter by three identical conductors. If the distance between the
meter and the conductor is short it is admissible to connect these two
objects by two conductors. Nevertheless errors introduced by this 2-wire
method (1ºC for each 0,4 of conductor resistance) should be taken into
account.
10.3. Alarm circuits
If the voltage of the power supply in the alarm circuit exceeds 24V then
due to safety reasons electric connections in relay contact circuits can be
executed only after disconnecting the power supply.
It should be remembered that the load of relay contacts should have
resistive character, motors or condenser batteries are not admissible. For
the latter cases intermediary contactors or other external relay elements
should be used unconditionally. Taking into account the relay durability it is
advisable to use an external contactor in case the output current exceeds
1 A. If the above recommendations are not observed relay contacts will
wear out and lose their connecting properties fast.
19

10.4. Serial port
The serial port can be connected with a corresponding computer or a
printer by the cable equipped with the special 9 or 25 pin Cannon
connector. It depends on the computer (printer) design.
Only 3 pins are used, namely: input, output, and ground.
The connection between the meter and the connector is presented
below:
11. Remarks concerning operational use of the
meter
The meter is a highly complicated electronic device. Its accuracy and
reliability depend on its work environment.:
!unobstructed air flow should be assured around the closed part of
meter casing
!placing the meter in vicinity of vibrating parts of machinery should be
avoided, as vibrations can result in instantaneous errors in
measurements
20
1
Meter 2 3
2
connector 9 pin female 3 5
3
connector 25 pin female
TxD RxD GND
2 7