Yuyao gongyi XMT-808 series User manual

OPERATION MANUAL
FOR
MICROCOMPUTER BASED
DIGITAL TEMPERATURE CONTROLLER
XMT*-808 series
Yuyao changjiang temperature meter factory
Yuyao gongyi meter CO.,LTD
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Yuyao gongyi meter co.,LTD
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Catalog
Catalog …………………………………………………………………………………………―1―
Safety notice mark ……………………………………………………………………………―3―
Ⅰ Survey ………………………………………………………………………………………―3―
Ⅱ Technical standard ………………………………………………………………………… ―4―
2.1 Input ………………………………………………………………………………… ―4―
2.2 Precision ……………………………………………………………………………… ―4―
2.3 Response time………………………………………………………………………… ―4―
2.4 Adjusting mode……………………………………………………………………… ―4―
2.5 Output specification………………………………………………………………… ―4―
2.6 Communication ……………………………………………………………………… ―4―
2.7 Alarm function………………………………………………………………………… ―4―
2.8 Insulate resistance voltage…………………………………………………………… ―4―
2.9 Manual function……………………………………………………………………… ―4―
2.10 Power supply………………………………………………………………………… ―4―
2.11 Work environment…………………………………………………………………… ―5―
2.12 Product authentication……………………………………………………………… ―5―
Ⅲ Model selection…………………………………………………………………………… ―5―
3.1 Model meaning ………………………………………………………………………―5―
Ⅳ Installation and connection ………………………………………………………………―5―
4.1 XMT-808wiring diagram………………………………………………………………―6―
4.2 XMTD-808 wiring diagram……………………………………………………………―6―
4.3 XMTA/E/F-808 wiring diagram………………………………………………………―7―
4.4 XMTG-808 wiring diagram……………………………………………………………―7―
4.5 SCR trigger wiring diagram……………………………………………………………―8―
ⅤFaceplate description……………………………………………………………………… ―8―
5.1 Faceplate chart…………………………………………………………………………―8―
5.2 Faceplate explain…………………………………………………………………… ―8―
ⅥBasic setting and operation…………………………………………………………… ―9―
6.1 Temperature fixed value setting…………………………………………………………―9―
6.2 Parameter setting……………………………………………………………………… ―9―
6.3 Manual/Auto……………………………………………………………………………―9―
6.4 Setting operation……………………………………………………………………… ―9―

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6.5 Manual setting itself………………………………………………………………… ―10―
ⅦFunction and setting……………………………………………………………………… ―10―
7.1 Operation flow chart …………………………………………………………………―10―
7.2 Parameter function description ………………………………………………………―11―
ⅧAdditional remarks of partial function ………………………………………………………―16―
8.1 Linearity current output ………………………………………………………………―16―
8.2 Time proportion Control …………………………………………………………… ―16―
8.3 Remote transmission pressure control ……………………………………………… ―17―
8.4 Thermocouple cold end compensating……………………………………………… ―17―
ⅨCommon control method……………………………………………………………………―18―
9.1 ON/OFF adjustment and alarm……………………………………………………… ―18―
9.1.1 ON/OFF adjustment introduction……………………………………………………―18―
9.1.2 ON/OFF adjustment illustrate………………………………………………………―18―
9.2 Temperature transmission ………………………………………………………… ―18―
9.2.1 Temperature transmission introduction…………………………………………… ―18―
9.2.2 Temperature transmission illustrate ……………………………………………… ―18―
9.3 Communication function………………………………………………………………―18―
9.3.1 Communication function introduction…………………………………………… ―18―
9.3.2 Communication function connection……………………………………………… ―19―
ⅩFault analysis and clearance…………………………………………………………………―20―
Attached1：Check list between parameter prompt letter and English letter…………………―20―
Product service directoryⅪ…………………………………………………………………… ―21―
Safety Notice Mark
Before reading the instruction, it will turn up the below mark, shows“Danger”、
“Attention”。
Danger
Procedures which may lead to dangerous conditions and
cause death or serious injury, if not carried out properly.
Attention
Remind user of paying attention to special content or
important content.
Attention
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Ⅰ、Survey
Thank you for the purchase of our XMT*-808 series microcomputer based digital temperature
controller.
This manual contains instructions for the install, operations, parameter setting and abnormal
diagnosis when operating the XMT*-808.please read and save this manual carefully before starting
operation ,so as to insure the steady .
XMT*808 series intelligence temperature controller uses nowadays the most advanced
monolithic microcomputer as mainframe，reduce peripheral assembly，and improve the reliability；
It adopts the control method of vague theory combined with traditional PID control, and make the
control process with the advantage of rapid response、small overshoot、high steady state precision. It
is intelligence temperature controller with the function of high performance、high reliability、complete
input，its function is suitable to all the occasion needed temperature measurement and control，also be
compatible with other industrial parameter measurement and control.
It adopts modular structure，further improve overall performance；The meter is operated with
4-keys,dual row 4-LED display for displaying the measurement value and set value or measurement
value and output value, with manual /automatic switch and setting itself function；with characteristic
of small volume、low power consumption、convenient operation、steady and reliable of running；
They are now widely used for the automatic control system over the area of machinery, chemical,
ceramics, light industry, metallurgy, petrifaction, heat treatment industry.

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Ⅱ、Technical standard
2.1、Input and range（one meter can be compatible）：
①Thermocouple：K（-50～1300℃）、S（-50～+1700℃）、T（-200～+350℃）、E（0～800℃）、
J（0～1000℃）、B（0～1800℃）、N（0～1300℃）、WRe(0～2300 )℃
②Thermal resistancer：CU50（-50～150℃）、PT100（-20～600℃）；
③Linearity voltage：0～5V、1～5V、0～1V、0～100mV、0～20mV；
④Linearity current（with diffluent resistance）：0～10mA、0～20mA、4～20mA
⑤Linearity input: -1999~+9999 (user freely setting)
2.2、precision：
①Input by thermal resistance , linearity voltage and linearity current 0.5F·S+1
②Thermocouple input adopt copper resistance or freezing compensate cold end 0.5 F·S +1；
③Although the meter can measure B、S、WRE during the temperature 0～600 ,its measurement℃
could not reach 0.5 class；
④differentiate rate：1、0.1；
2.3、response time: ≤0.5s (filter parameter sets 0)
2.4、Adjusting mode：
①ON/OFF control method（Return difference can be adjusted）；
②Common PID control（with the parameter of self-setting function）
③Intelligence adjustment(including vague PID adjustment and advanced control algorithm with the
parameter of self-setting function)；
2.5、Output specification：it make out directly output parameter modularity or without modularity：
①The switch of relay contact point output（open+ closed）：250VAC/7A or 30VDC/10A；
②SSR voltage:12VDC/30mA(apply for driving SSR relay)；
③Contact point output with controllable silicon: can contact 5～500A two directions controllable
silicon;2 separate directions controllable silicon opposite direction parallel.
④Liner electric current output：initial current and terminal current value can be defined when the
output is 0～24mA（voltage range 11～23VDC）；
2.6、Communication：
Support RS485communication mode，adopt AIBUS communication agreement，and baud rate
support the below selection ：1200bps、4800bps、7200bps、9600bps
2.7、Alarm:
Support two passive contact output，relay contact 250VAC/7A；It has four methods including
upper limit, lower limit, positive deviation ,negative deviation .It can output 2 ways at most；
2.8、Tolerance for pressure when it is segregated：Between electric power ,relay’s contact and signal’s end ,do
2000V pressure tolerance test 1s,there is no abnormal phenomenon;
2.9、Movement with hand: Automatic /Manual；
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2.10、Power supply:

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①85V-242VAC，50-60HZ；power consumption ≤4W
②24VDC/AC power consumption≤4W ；
③220VAC±10% 50HZ；power consumption≤4W
2.11、working circumstance ：
Environment temperature:0～50℃，humidity ≤85％,no corrode and strong electromagnetism
disturb；
2.12、Product authentication：
XMT*-808 series temperature meter acquire CE authentication and ROHS Environmental
Protection authentication.
Ⅲ、Model selection
Model selection instruction
About XMT*808 series intelligence temperature controller，we mark specific
model on each piece. According to on site control request by itself ,client should contrast
the meaning of the product model code carefully before use and choose，to avoid wrong
use or wrong model selection.,or you can telephone to consult.
3.2 Product code
XMT □ 8□8 □□
（1） (2) (3) (4) (5)
（1） The External dimension：
Blank：160×80×120 Installation hole 152×76；
A：96×96×110 Installation hole 92×92；
D：72×72×110 Installation hole 68×68；
E：48×96×110 Installation hole 44×92；
F：96×48×110 Installation hole 92×44；
S：80×160×120 Installation hole 76×156
G：48×48×110 Installation hole 44×44
（2） Control Mode：‘8’：four key set, two row LED display,，fuzzy control.
（3） Additional alarm：‘0’：no alarm ；‘1’：one group alarm；
‘3’：two group alarms ‘5’：voice alarm
（4） Signal input type：‘8’：freely exchange signal
（5） Suffix：
Main control output method：
‘Blank’
：relay’s open and closed contact output；
‘A’：Single-phase over-zero spark pulse；
‘A3’：Three-phase over-zero spark pulse;
‘B’：Single-phase shift-phase spark pulse；
‘B3’：Three-phase shift-phase spark pulse；
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‘C’：0～10mA or 4～20mA constant electric current output

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‘E’：Linearity voltage output；
‘G’：ON/OFF solid state relay（SSR）adjustment output；
Auxiliary ways：
‘K’：with RS485 or RS232 communication module interface；
‘Wt’：with micro-printer output signal；
‘V’：DC24V、DC12V、DC5V output；‘P’：30 segment program
Ⅳ、Installation and connection
Connection explanation
XMT*808 series intelligence temperature controller, it provides the below wiring
diagram for reference；Client can make the correct connection according to the meaning of
the model code.；when find the wiring diagram is different from the meter model, or the
order is the special specification，please be confirm to case connection，or you can telephone
to consult.
4.1 XMT-808 wiring diagram
Figure4－1
Note：linearity voltage range under 1V can input by terminal 1、2，signal 0～5V and 1～5V can input by terminal 1、
4. 4～20mA linearity current input can achieve by changing 250Ωor 50Ωresistance to 1～5V or 0.2～1V voltage
signal，and then input from 1、2 terminal or 1、4 terminal.
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4.2 XMTD-808 connection
Figure4－2
Note：linearity voltage range under 1V can input by terminal 13、14，signal 0～5V and 1～5V can input by
terminal 11、14。4～20mA linearity current input can achieve by changing 250Ωor 50Ωresistance to 1～5V or 0.2～
1V voltage signal, and then input from 11、14 terminal or 13、14 terminal.
4.3 XMTA/E/F-808 wiring diagram
Figure4－3
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Note：linearity voltage range under 1V can input by terminal 15、16，signal 0～5V and 1～5V can input by
terminal 13、16。4～20mA. linearity current input can achieve by changing 250Ωor 50Ωresistance to 1～5V or 0.2～
1V voltage signal, and then input from 13、16 terminal or 15、16 terminal .
4.4 XMTG-808 connection
Figure4－4
Note：linearity voltage range under 1V can input by terminal 4、5，signal 0～5V and 1～5V can input by terminal
2、5.4～20mA4～20mA. linearity current input can achieve by changing 250Ωor 50Ωresistance to 1～5V or 0.2～
1V voltage signal, and then input from 4、5 terminal or 2、5 terminal .
4.5 Controllable silicon contact connection
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Ⅴ、Panel Explanation
5.1 Panel chart
5.2 Panel explanation
1、PV------- Measured value indicator (red)
2、SV------- Set value indicator (green)
3、A-M-------- manual indicator lamp or setting itself(green)
4、ALM1------ AL1 indicator（red）
5、ALM2------ AL2 indicator（red）
6、OUT--------output indicator(green)
7、SET--------function key
8、◄----------- data automatic/manual shift function key
9、▼-------Data reduce key
10、▲-------Data addend key
When the power is on，the upper display window displays measured value（PV），the lower
display window display set value（SV）.
There are 4 LED indicator on the faceplate，their meaning as below：
OUT indicator：when the linearity current output ，output indicator reflect the current size by
the change of output indicator’s light and dark，when output with time scale method（relay、solid relay
and controllable silicon contact output when it exceed zero. Scintillation time scale reflect output size.
ALM1 indicator：when ALM1 output is ON ,a red LED lights.
ALM2 indicator：when ALM2 output is ON ,a red LED lights.
A-M indicator：Manual indicator
★Attention：
Faceplate instruction just take XMTD-808 for instance ，other model take
XMTD-808 for reference.
Ⅵ、Basic setting and operation
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6.1、Temperature fixed value setting.：Under normal condition，press▲or▼to enter into
fixed value setting state，At that time，the lower nixie tube scintilla the decimal point，and then
press▼、▲、◄（A/M）key to modify the setting data. Press SET to save and exit. If there is no

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button operation ,it will exit automatically the state after 10 s.
6.2、Setting parameter：press SET key for 3 second to enter setting parameter state. In this state
press SET key ,the instrument will display each parameter in turn, for example, upper limit ALM1、
parameter lock LOCK and so on，and for the instrument with good configuration and parameter
lock, only display needed parameter (the parameter on site) .Use ▼、▲、◄（A/M）key can modify
the parameter data.First press◄（A/M）key and simultaneity press SET key can exit the setting
parameter state.If there is no button operation ,it will exit automatically the state after 10 s.
6.3、Manual/Automatic mode switch（A-M=0）：press◄（A/M）key can make the instrument
switch between A/M. If the instrument works on Manual mode ,its output value can be increased or
decreased by pressing ▲key or ▼key under display status, and the lower display the first word
‘M”. If the instrument works on AUTO mode, press SET key can look for the automatic output
data(the lower display the first word“A”).Through parameter setting ‘A-M’（refer to the back
instruction）can make the instrument don’t allow to switch to manual mode by panel button
operation in case that enter the manual mode blind.
6.4、Setting itself（At）：Use the instrument at first time, start the function setting itself to assure
P、I、d control parameter. First do this ,switch the instrument into normal display state ,press ◄
（A/M）key for 3 second（AT = 1 ），the lower display alternately “At”. when the instrument setting
itself, the instrument use ON/OFF control, after 2-3 times ON/OFF,it will calculate automatically
P、I、d control parameter. If stop setting itself in advance ,press ◄（A/M）key for 3s, and make “At”
disappeared .For different system, the time setting itself needed is different. After finishing the
setting itself successfully ,the instrument will set parameter At to 3，so it will not set itself through
press ◄（A/M）key on the panel so as to avoid artificially by accident to restart the setting itself.
The instrument can set parameter At to 2 when it restart after one time .（reference the back article
“parameter function”description）.
Before doing setting itself,it should set the assigned data into the common data or the median, if the
system is an electric cooker with good heat preservation property, the assigned data should be set
the biggest data allowed before start. The setting of Parameter t（Control period）and Hy（return
difference）will effect the process of setting itself .In a general way ,for these two parameter ,the
setting data are smaller, the parameter accuracy will higher. But if Hy data is smaller,the instrument
will be brought ON/OFF adjustment wrong action ,it will set wrong parameter .Command t=0-2，
Hy=0.3。
★Attention：
Avoid no load setting when setting itself ,it should be ineffectual when it set with no
load.
6.5、(Movement with hand)Setting itself：As it adopt “ON/OFF ” adjustment, its output can be
positioned in the place defined by parameter outL and outH. In the occasion where didn’t allow big
extent change, such as the occasion some actuator adopt controlling valve, the common setting
itself is not suitable ,it only need to set with hand. Firstly adjust with hand, after the adjustment is
stable, then use it automatically，so the output value will be limited in the current hand movement
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value range of +10% and -10% range ,not the range defined by outL and outH，consequently it
avoid not allowing valve’s big extent change. Besides, Movement with hand will get more
accurate result when the controlled physical quantity ’response fast.
Ⅶ、function and setting
7.1 Operation flow chart
7.2、Parameter function description（Meter’s input ,output, alarm and control method can be defined
by parameter.）
Code Meaning Description Setting
range Ex-Factory
ALM1
High limit
alarm
When the measured value more than ALM1+Hy, the meter
have upper limit alarm. When the measured value less than
ALM1-Hy, the meter will free from the upper limit alarm.
Set the ALM1 =9999 can avoid come into being alarm
function.
-1999～
+9999℃
or 1
unit
9999℃
ALM2 Low limit
alarm When the measured value less than ALM2-Hy, the meter The
same as 1999℃
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XMT*808series E-mail:[e-mail] http://www.yycj.com.cn
have lower limit alarm. When the measured value more
than ALM2+Hy, the meter will free from the lower limit
alarm. Set the ALM2=－1999 can avoid come into being
alarm function
above
Hy-1
Positive
deviation
alarm
When the deviation （PV-SV）＞ Hy-1+Hy, the meter
have positive deviation alarm. When the deviation less than
Hy-1-Hy, the meter will free from the positive deviation
alarm. If set the Hy-1=9999 (temperature is 999.9℃),the
alarm will be cancelled. When use ON/OFF adjustment,
Hy-1 and Hy-2 are the second upper limit and lower limit
absolute value alarm.。
0～999.9
℃
or 0 ～
9999℃
1 unit
9999℃
Hy-2
Negative
deviation
alarm
When the negative deviation（SV-PV）＞Hy-2+Hy, the
meter have negative deviation alarm. When the negative
deviation（SV-PV）＜ Hy-2-Hy, the meter have no negative
deviation alarm. Set the Hy-2=9999(temperature is 999.9
℃), the alarm will be cancelled
The
same as
above
9999℃
Hy Dead band
Hy is set to permits protection of position control output
from high switching frequencies caused by process input
fluctuation.
If the meter use ON/OFF adjustment or parameter setting
itself , provided appointed value SV is 700℃, Hy is 0.5℃,
by reaction adjustment (heating control)
（1）Output is switch on , when the measure temperature
value is more than 700.5℃, the (SV+Hy) will close.
（2）Output is switch off, when the measure temperature
less than 699.5℃(SV-Hy), switch on again and heating.
0-200.0
℃
or 0-2000
℃
0.5
At PID Control
method
At=0, ON/OFF control, suitable for the application which
don’t need high precision.
At=1, artificial intelligence control / PID control, allow to
set the auto tuning function from front panel.
At=2, startup auto tuning function, after auto tuning finish,
it will set 3.
At=3, artificial intelligence control. After auto tuning
finish, the meter automatism enter into this set, this setting
don’t allow to set from front panel.
0-3 1
I Hold
parameter
I, P, D, t these parameter are for artificial intelligence
control algorithm, but no for ON/OFF control mode
(At=0).
I is defined as measurement variation after output is
changed. Generally I parameter of the same system will
changes with measurement value, and so I parameter
should be configured with process value around operation
point.
For example: take temperature control of electric furnace,
operating point is 700℃, to find out optimum I parameter,
assuming that when out remains 50%, the temperature of
electric furnace will finally be stabilized around 700℃, and
when output changes to 55%, the temperature will final be
at around 750 ℃. The I (optimum
parameter)=750-700=50.0 (℃)
I parameter mainly determines the degree of integral
0-999．9
or 0-9999 500

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function, similar as integral time of PID control. When the
I smaller, the calculus function strong. When the I larger,
the calculus function weaken (calculus time add). When
I=0, the system will cancel the calculus function and
artificial intelligence adjustment function, the instrument
will turn to an PD adjustment.
P Rating
parameter
P is in reverse proportion to measurement variations caused
by output changes by 100% in one sec..
When At=1 or 3, then P=1000÷measurement elevatory
value per sec. , the unit is 0.1℃or 1 defined unit.
Example: the instrument use 100% power to heat and there
is no heat loss, electric cooker 1℃each sec., then P=1000
÷10=100. P like PID instrument’s proportion area, but
diversification is reverse. P ↑, the proportion and
differential function ↑, if P ↓, the proportion and
differential function↓. P parameter and calculus function
have no relation. Set P=0 corresponds to P=0.5
1-9999 100
d Lag time
Parameter “d” is applied as one of the important
parameters of XMT808 artificial intelligence control
algorithm. “d” is defined as follows: time needed for a
electric furnace from the beginning of elevating
temperature to get to 63.5% against the final speed of
temperature elevating, provided there is no heat loss. The
unit of parameter “d” is second.
For industrial control, hysteresis effect of the controlled
process is an important factor impairing control effect. The
longer is system lag time, the more difficult to get ideal
control effect. Lag time parameter “d” is a new introduce
important parameter for XMT808 artificial intelligence
algorithm. XMT808 series instrument can use parameter
“d” to do fuzzy calculation, and therefore overshoot and
hunting do not easily occurs and the control have the best
responsibility at the time.
Parameter “d” gives effect on proportion, integral and
differential function. Decreasing parameter “d” will
strengthen proportional and integral function and weaken
differential function, with the extent of strengthening
greater than that of weakening. And therefore as a whole
decreasing “d” will strengthen feedback function. If d≤T,
derivative function of system will be eliminated.
0-2000s 100
t Output
period
Parameter can be set between 0.5 to 125s (0 means 0.5s).
It represent the instrument of the calculate speed. When t
↑, the proportion function ↑, differential function ↓.
When t↓, the proportion function↓, differential function
↑. When t ≥5s, differential function is absolutely
eliminated, then the system is a proportional or
proportional-calculus adjustment. If the t less than 1/5 of its
lag time, the change is very small influence to control. If
d=100, the t set 0.5 or 10s the control effect basic is same.
0-120s 20

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（1）it is insignificant when ON/OFF control ；
（2）Relay output：‘t’usually be set 10s upwards，other
output method be set 1～2s；output is relay output, the
shorter the time, the better the control effect ,but it will
affect the relay’s
life.
Sn Input specification：
Sn Input spec. Sn Input spec.
0 K 1 S
2 WRe 3 T
4 E 5 J
6 B 7 N
8-9 special
thermocouple 10
ient appointed to
increase input
specification
11-
19
special
thermocouple 20 CU50
21 PT100 22-25 Special thermal
resistance
26 0-80 Ω resistance
input 27 0-400 Ω resistance input
28 0-20mV voltage
input 29 0-100mV voltage input
30 0-60mV voltage
input 31 0-1V(0-500mV)
32 0.2-1V voltage
input 33
1-5V voltage input
or
4-20mA current input
34 0-5V voltage input 35 -20-+20mV(0-10V)
Sn specification
Input
36
-100-+100mV or
2-20V voltage
input)
37 -5V-+5V(0-50V)
0-37
0
dP
Decimal
point
position
When it is linearity input: parameter dP is used to define
decimal point place according to users’ habit
dP=0, display pattern is 0000, decimal point not displayed
dP=1, display pattern is 000.0, decimal point is at ten’s
place
dP=2, display pattern is 00.00, decimal point is at
hundred’s place
dP=3, display pattern is 0.000, decimal point is at
thousand’s place
In case of thermocouple or RTD input: dP is used to define
temperature display resolution
0-3 0

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dP=0, temperature display resolution is 1℃
dP=1, temperature display resolution is 0.1℃
Adjustment of this parameter only affects the display, and
gives no effect on control precision or measurement
precision
P-SL Input lower
limit
(1) When the linearity input define single lower limit
value, external appointed, output display.
For example: a pressure transmitter is used to convert
pressure signal ( temperature, flow and humidity
signals also possible) to standard 1-5V input (4-20mA
can external contact 250Ωresistance to change).
1V signal pressure is 0, 5V signal pressure is 1mPa, if
want the instrument display is 0.001mPa. the
parameter can be set as the following:
Sn=33 (select 1-5V linearity voltage input)
dP=3 (set decimal point, display 0.000)
P-SL=0.000 (define the pressure display value when
the input lower limit 1V)
P-SH=1.000(define the pressure display value when
the input upper limit 5V)
(2) When the thermal resistance, thermocouple input
defining lower limit appointed value.
-1999～
+9999℃ 0
P-SH Input upper
limit
When the linearity input defining single upper limit value,
use with P-SL .
The
same as
above
2000
Pb Input shift
Parameter Pb is used to make input shift to compensate the
error produced by sensor or input signal itself. For
thermocouple input, parameter Pb is used to correct
reference junction compensation error.
-199.9
～
+199.9
℃
0
oP-A Output mode
Op-A denote output signal mode, and must conform to the
module type installed as main output.
Op-A=0, the mode of main output is time-proportional
output (for artificial intelligence control) or ON/OFF mode
(for ON/OFF control). If output modules such as SSR
voltage output or relay contact discrete output, it should set
Op-A=0.
Op-A=1, any specification linear current continuum output,
Op-A=2, time proportional output
0-2 0
outL Output lower
limit Restrain minimum value of adjust output 0-110% 0
outH Output upper
limit Restrain maximum value of adjust output. 0-110% 100
AL-P
Alarm
Output
definition
AL-P used to define ALM1, ALM2, Hy-1 and Hy-2 alarm
output locality. Its function is determined by the following
formula:
AL-P= A x 1 + B x 2 + C x 4 + D x 8 + E x 16
If A=0, then upper limit alarm by the relay2 output
If A=1, then upper limit alarm by the relay1 output
If B=0, then lower limit alarm by the relay2 output
If B=1, then lower limit alarm by the relay 1output
If C=0, then positive deviation alarm by the relay 2output
If C=1, then positive deviation alarm by the relay1output
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If D=0, then negative deviation alarm by the relay 2 output
If D=1, then negative deviation alarm by the relay 1output
If E=0, then alarm types, such as “ALM1” and “ALM2”
will be displayed alternately in the lower display window
when alarm occurs.
For example: If it need that the upper limit alarm by the
alarm1 relay output, lower limit alarm、positive deviation
alarm and negative deviation alarm by alarm2output, when
alarm occurs no alarm type display in the lower display
window. Then we reach a conclusion: A=1、B=0、C=0、
D=0、E=1, and parameter “AL-P” should be configured to:
AL-P= 1x1+0x2+0x4+0x8+1x16=17
CooL System
function
COOL is used to select some system function：
CooL=A×1+B×2
A=0, reaction control mode, if the input increase, the
output will diminishment like heating control.；
A=1, direct action control mode, if input increase, output
will increase like cooling control.
B=0, without the function of alarm while at the power on or
SV change
B=1, have the alarm function while the power on and
when the SV change have no alarm function.
0-7 2
Addr
Communicat
ion
address
When the instrument have RS485 , Addr can be configured
the ranged of 0 to256 In the same communication line’s
instruments, every one need have a different address.
0-256 0
bAud
Communicat
ion
Baud rete
When the instrument have communication interface,
parameter bAud is communication baud rate, the range is
300-19200bit/s(19.2K).
－ 9600
FILt
PV
input
filter
When the FILt value set large, the measurement value is
stabilized but the response time is longer.。 0-20 0
A-M Operation
condition
A-M is define manual / automatic control state
A-M=0, manual control state
A-M=1, automatic control state
A-M=2, automatic control state, in this state manual
operation is prohibited. When the manual function is not
required, it can avoid entering manual state due to
operator’s false operating.
If use the RS485 to control the instrument, the transfer of
automatic/manual status can be carry out by adjusting
parameter A-M from computer.
0-2 1
LocK lock
Lock=0, can set locale parameter and SV.
Lock=1, can display and view the locale parameter, but
don’t to modification. The SV can set.
Lock=2, can display and view the locale parameter, but the
locale parameter and SV all cannot modification.
Lock=808, all the parameter and SV can set.
When the Lock is set other values except 808, then only
locale parameter the range of 0 to 8 r and parameter Lock
itself can be display and set.
0-9999 808

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EP1-
EP8
Field
parameter
definition
When configuration of the instrument is completed, most
parameters will not need to be locale operators.
Furthermore, locale operators may not understand many
parameters, and may probably set parameters incorrectly by
mistake and make the instrument unable to work.
EP1-EP8 defines 1-8 locale parameters for operators’ user
in parameter table. Their parameter values are parameters
except parameter EP itself like ALM1、ALM2, etc. When
LOCK=0,1,2 and so on, only be defined parameter can
display, other parameters can not be displayed and
modified. This function can speed up the parameter
modification and prevent important parameters (like input,
output parameters) from modifying falsely.
Parameter EP1-EP8 can define 8 locale parameters at most,
if the number of locale parameters is less than 8
(sometimes even none), it is necessary to define useful
parameters from EP1-EP8 in order, the first parameter
which are not used is defined as none. For example, two
parameters of ALM1 and ALM2 are need to be modified by
locale operators, the parameter EP can be set as follows:
Loc=0、EP1=ALM1、EP2=ALM2、EP3=nonE
Sometimes locale parameters are not needed after we finish
adjusting the instrument, we can set EP1 parameter an
nonE
－ none
Ⅷ、Additional remarks of partial function
8.1 linear current output
Any specification linear current continuum output.（OP-A=1）：output upper limit and output
lower limit define the instrument’s current output specification, and its range can set at random
between 0-22mA,for example output 0-10mA,so the setting is outL=0,outH=100(unit is
0.1mA).4-20mA can be set outL=40,outH=200,and it can also define nonstandard output,for
example output 2-8mA，set outL=20,outH=80 and so on .During setting,output can be valid when
outL is less than outH.
8.2 Time proportion control
Time proportion output（0P-A=2；OP-A=0 relay output or SSR voltage output：In case of time
proportional output mode,the output value can change by adjusting,during a fixed base period,the
ratio of on-off time(or the ratio of the time during which SSR high voltage output or low voltage
output is activated).
Time proportional output can be regarded as a square wave,the base period of which equals to
control period”T”,and the output value of which direct proportional to the on-off ratio of the square
wave.The on-off ratio may be configured to be in the range of 0% to 100%.For special
applications,the range of time proportional output can be clamped by tuning parameters “OutL” and
“OutH”.For example,if the output need to be clamped to between 20-60%，then OutL=20，
OutH=60may just be set.Normally in case of time proportional output,if OutL=0，OutH=100 is

Yuyao changjiang temperature meter factory
set ,then there will be no output limit.
★Attention：
when OP-A=2，there is no alarm output
8.3 Long distance transfer pressure control
YTZ-150 resistance long distance transfer pressure gauge mating setting method：instrument
setting parameter Sn=27
dP decimal point position，P-SL Input lower limit，P-Sh input upper limit Pb input shift
（Note：Display range =display upper limit data –display lower limit data；resistance range =
long distance transfer resistance pressure gauge range’s correspondent resistance data; starting
resistance=long distance transfer resistance pressure gauge’s correspondent resistance data；full range
resistance = long distance transfer resistance pressure gauge full range’s correspondent resistance
data；starting range=display lower limit data；full range =display upper limit data；）
8.4 thermocouple cold junction compensate
Using connection method to choose thermocouple cold junction
automatically compensate mode
When adopt thermocouple as signal ,it should do temperature compensate to thermocouple according
to the testing principle, XMT-808 series instrument can measure the temperature near the instrument’
s back connection terminal and do automatically compensate to thermocouple, as the deviation of
testing component、the instrument itself turn hot or the other heat source near the instrument(the
temperature of connection terminal will also rise),it will cause the deviation of automatic compensate
mode turn bigger.so it need to adopt copper resistance compensate the high precision request. 808
series instrument can use the different to choose several compensate mode,so as to provide flawless
thermocouple compensate scheme.
（1）Inner automatic compensate：when the instruments leave factory ,they are all adopt this mode to
satisfy the most industrial application. but as for the flamestat installed in the inner, and it easily
effected when the instrument got hot or effected by compensating lead wire and ambience, and
deviation temperature can reach 2-4℃。
（2）Circumscribe CU50 copper resistance sensor compensating：place a connection
box, put CU50 copper resistance （it need to buy）and the terminal cold junction together far away
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from the several heat object,so the testing deviation will be less than 0.5 .As CU50 copper resistance℃
itself deviation will cause room temperature with a little deviation,it can use SC parameter to modify.
Change the outer connect copper resistance to precision fixed resistance can achieve constant
temperature bath function.
Figure 8-1
Ⅸ、Instrument common working method
9.1 ON/OFF adjustment/Alarm
9.1.1 ON/OFF adjustment Introduction
ON/OFF adjustment（ON/OFF）is an easy adjustment method, it usually used for temperature
control or alarm to that with low control precision occasion. When using ON/OFF adjustment, it
use the inner relay to control the middle of outer relay and then control AC contactor to control
heating wire ‘s on/off to achieve the temperature control.
Parameter Hy can determine dead band of ON/OFF adjustment. AT=0,OP-A=0,parameter CooL’s A
can used to decide adjustment direction of positive interaction or counteractive，CooL.A=0 时,OUT
is heat control ,CooL.A=1,OUTis refrigeration control，the instrument below display window SV is
setting point.
9.1.2 ON/OFF adjustment illustrate：
For example：heating installation，temperature control requirement as follows：temperature rise to
100 ,stop heating℃，lower to 96 start heating℃，temperature exceed 110 will alarm℃，lower than
50 will℃alarm.
According to the above request, choose XMT*838 series，set the below parameter：set temperature
fixed value（SP＝98）,set setting itself parameter（At＝0），set main control return difference（Hy
＝2）,set upper limit alarm（ALM1＝110）,set lower limit alarm（ALM2＝50）。
9.1.3 Alarm function
Besides ON/OFF adjustment ,there is also 2-ON/OFF adjustment,3- ON/OFF adjustment,
4- ON/OFF adjustment or add alarm output, it should use alarm function ,so it make up of
upper-lower limit alarm、upper-upper limit alarm and lower-lower limit alarm instrument. XMT808
series have ALM1、ALM2、Hy-1、Hy-2 4 alarm setting point ,during ALM1、ALM2、Hy-1、Hy-2
these alarm parameter which aren’t used should be set limit data(the data have be set before leaving
factory)，so as to avoid unnecessary action.
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