Oven TPM138 User manual

ТРМ138
Passport and
operaton manual
Multi-purpose
eight-chanel
meter-adjustier
1st Veshnyakovsky pr., 2
Moscow, Russia, 109456
Phone: (495) 1748282, 1710921
Р.№
Зак. №

1
TRM138
Содержание
INTRODUCTION .......................................................................................................... 3
1. PURPOSE .............................................................................................................. 4
2. TECHNICAL CHARACTERISTICS ............................................................................ 5
3. INSTRUMENT DESIGN AND OPERATION ................................................................ 7
3.1 Functional Block Diagram ................................................................................ 7
3.2 Block Diagram Elements .................................................................................. 8
3.2.1 Input Sensing Devices ............................................................................ 8
3.2.2 Input Parameters Measuring ................................................................... 8
3.2.3 Mathematical Values Computation ......................................................... 10
3.2.4 Measured Parameters Indication ............................................................ 11
3.2.5 Logic Units ............................................................................................. 11
3.2.6 Output Units ........................................................................................... 13
3.2.7 Emergency Alarm and Warning ............................................................... 15
3.3 Instrument Design ........................................................................................... 16
3.4 Display and Control Elements .......................................................................... 16
4. SAFETY MEASURES ............................................................................................... 18
5. ONSITE INSTALLATION .......................................................................................... 19
5.1. Installation of the Instrument .......................................................................... 19
5.2. Installation of External Communications .......................................................... 19
5.2.1. General Requirements ........................................................................... 19
5.2.2. Installation Instructions .......................................................................... 19
5.2.3. Instrument Connection ........................................................................... 20
6. SETTINGUP PROCEDURES .................................................................................. 21
6.1. General Requirements ..................................................................................... 21
6.2. Configuring ..................................................................................................... 21
6.3. Programmed Parameters Testing and Setting ................................................. 24
7. OPERATION MODES .............................................................................................. 25
7.1. OPERATION Mode ........................................................................................... 25
7.2. PROGRAMMING Mode .................................................................................... 26
7.3. ADJUSTMENT Mode ....................................................................................... 26
8. MAINTENANCE ..................................................................................................... 27
9. MARKING AND PACKING ....................................................................................... 28
10. TRANSPORTATION AND STORAGE ......................................................................... 28
11. DELIVERY LIST ...................................................................................................... 28
12. WARRANTY ............................................................................................................ 28

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TRM138
APPENDICES
1. DIMENSIONAL DRAWING ........................................................................................ 29
2. INSTRUMENT CONNECTION ................................................................................... 30
3. PROGRAMMED PARAMETERS ................................................................................ 35
4. CONNECTING RESISTIVE TEMPERATURE TRANSDUCERS OVER
A TWOWIRE CIRCUIT ............................................................................................ 40
5. INSTRUMENT ADJUSTMENT .................................................................................. 41
A5.1. General ......................................................................................................... 41
A5.2. Adjusting the instrument for operation with transducers CRTT 50 40
M and PRTT 50P ............................................................................................ 41
A5.3. Adjusting the instrument for operation with transducers TC 100M
and PRTT 100P .............................................................................................. 42
A5.5. Adjusting the instrument for operation with thermal couples of
TPP(S), TPP(R) and TVR(A1) type. ................................................................. 43
A5.6 Adjusting transducer of thermal couples free ends temperature ..................... 44
A5.7. Adjusting the instrument for operation with 0…1.0 V active
transducers. .................................................................................................. 45
A5.8. Adjusting the instrument for operation with 0…5.0 mA active
transducers. .................................................................................................. 45
A5.9. Adjusting the instrument for operation with active transducers
4…20.0 mA and 0…20.0 mA. ........................................................................... 45
A5.10. Adjusting the “parametercurrent” output digitalanalog
converters ..................................................................................................... 46
RECORD OF REVISIONS .............................................................................................. 48

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TRM138
This Operation Manual is intended to familiarize service personnel with the design, principle
of operation, working and maintenance procedures of the TRM138 multipurpose eightchannel
meteradjuster (hereinafter referred to as the “instrument”).
This Operation Manual is applied to TRM138X instrument manufactured as per TU 4211 003
46526536 03.
The instrument has a conformity certificate No.03.009.0306 and a measuring instrument
approval certificate RU.C.32.004.A No.16445.
TRM138 instrument is manufactured in several versions which vary in types of builtin output
equipment for control over actuating units. The version information is indicated in the code number
which is the last symbols in the full name of the TRM138X instrument; the code number meaning
is as follows:
TRM138Х
Builtin output equipment types:
R– electromagnetic relays;
K– transistor optical couples of n–p–ntype;
C– triac optical couples;
I– digitalanalog converter «parameter – current” 4…20 mA.
Note. If required, the instrument can be supplied in various output equipment configuration. These required
equipment configurations and number of equipment in each configuration type should be indicated in purchase
order for TRM138.
Example of the instrument’s full name title for ordering: ТRМ 138R.
In this “Operation manual” the following acronyms and abbreviations are used:
OU – output unit;
LU – logical unit;
NSC – nominal static characteristic;
TC – thermocouple (thermoelectric converter);
RTT – resistive temperature transducer;
Cu – copper resistive temperature transducer;
Pt – platinum resistive temperature transducer;
DAC – digitalanalog converter;
DI – digital indicator.
Introduction

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TRM138
1.1. TRM138 instrument is a component part for production process automatic monitoring and
control systems used in various industries, agriculture and municipal services.
1.2. The instrument is designed for the following operations:
– measuring of physical properties;
– digital filtration of measured parameters from process impulse noise;
– correction of measured parameters for elimination of errors in sensing devices;
– indication of measurement data on builtin LED fourdigit digital indicator;
– generation of alarm signal at fault of sensing devices with indication of the fault cause on
the digital indicator;
– generation of actuating signals for outside actuating units in accordance with preset laws
of control;
– indication of preset control parameters on the digital indicator;
– generation of manual control signals for actuating units from the keyboard;
– transfer of data on values of parameters controlled by sensors and preset working para
meters to a computer as well as receiving from a computer of feedback data for change
in parameters;
– recording of preset values of programmed parameters in the nonvolatile memory at power
cutoffs.
1.3. Operation conditions:
– closed explosionproof rooms without aggressive vapors and gases;
– ambient temperature: from +1 to +50 °C;
– upper limit of relative air humidity: 80 % at 25°C and lower temperatures without
moisture condensation;
– atmospheric pressure: from 86 to 106.7 kPa.
PURPOSE Section 1

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TRM138
Section 2 Technical Characteristics
The general characteristics of the TRM138 instrument are presented in Tables 1, 2, 3.
Table 1
General characteristics
Description Value
Power supply voltage range 90...245 V alternate/direct current (47...63 Hz)
Power consumption not greater than 12 VA
Number of measurement channels 1…8
Interrogation time per one channel not longer than 0.6 sec
Number of control channels 1…8
Number of output devices 8
Voltage of active transducers 24±3 V direct current (150 mA max)
Computer communications interface RS485
Casing protection rating (from the front panel) IP54
Overall dimensions 96х96х140 mm
Weight not greater than 1.5 kg
Table 2
Input sensing devices
Description and NSC Measurement range Resolution Basic reduced error limit
Resistive temperature transducers according to the State Standart (GOST) R 665194
Cu 50М W100 = 1.426 –50 ... +200 °С 0.1 °С
Cu 50М W100 = 1.428 –190 ... +200 °С 0.1 °С
Cu 100М W100 = 1.426 –50 ... +200 °С 0.1 °С
Cu 100М W100 = 1.428 –190 ... +200 °С 0.1 °С 0.25 %
Pt 50P W100 = 1.385 –200 ... +750 °С 0.1 °С
Pt 50P W100 = 1.391 –200 ... +750 °С 0.1 °С
Pt 100P W100 = 1.385 –200 ... +750 °С 0.1 °С
Pt 100P W100 = 1.391 –200 ... +750 °С 0.1 °С
According to the State Standart GOST 665178
Cu gr. 23 –50 ... +200 °С
Thermocouples according to the State Standart (GOST) R 8.5852001
L –50 ... +750 °С 0.1°С
J –50 ... +900 °С 0.1°С
N –50 ... +1300 °С 1 °С
К –50 ... +1300 °С 1 °С 0.5 %
S 0 ... +1750 °С 1 °С
R 0 ... +1750 °С 1 °С
А1 0 ... +2500 °С 1 °С
Direct voltage and current signals according to the State Standart (GOST) 26.01180
0 … 5 mA 0 … 100 % 0.1 %
0.25 %
0 …20 mA 0 … 100 % 0.1 %
4 …20 mA 0 … 100 % 0.1 %
0 …50 mV 0 … 100 % 0.1 %
0 …1 V 0 … 100 % 0.1 %
Notes.
1. W100 – ratio of the transducer’s resistance measure d at 100 °C to its resistance measure d at 0°C.
2. Only insulated thermocouples with unearthed measuring junctions can be used for operation with the device.

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TRM138
Table 3
Output equipment
Description (type) Limit load
Electromagnetic relay 4 A at voltage not greater than 220 V, 50 Hz and cos ϕ> 0.4
Transistor thermocouples n–p–ntype 200 mA at voltage not greater than 40 V, direct current
Triac thermocouples 50 mA at voltage up to 300 V (constantly open triac) or
0.5 A (switched on triac with frequency not greater than
50 Hz and timp = 5 msec)
Converters “parameter – current” 4 … 20 mA 0 … 800 Ohm
Notes.
1. Outputequipment types are defined by the instruments modification.
2.Limitloadof “parameter– current” converteris defined inview of Item3.2.6.7.
Technical Characteristics Section 2

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TRM138
3.1 Functional Block Diagram
3.1.1 The instrument’s functional block diagram is presented in Figure 1.
Figure 1. Functional block diagram
3.1.2 The functional block diagram includes the following components:
d1 … d8 – input sensing devices (transducers) to monitor physical properties of the facility
(are not part of the instrument, conventionally introduced in the diagram as a matter of convenience);
AC1 – automatic commutation device to receive signals from primary sensing devices and
transmit them to the measuring devise;
MD – measuring device to convert signals from sensing transducers to numerical values of
parameters controlled by these transducers as well as to calculate mathematical values required
for the instrument’s operation;
AC2 – automatic commutation device to receive measured input parameters and transmit
them to the logical units;
LU1 … LU8 – logical units to generate actuating signals by the output equipment and to output
the measured values of input parameters to the digital indicator;
AC3 – automatic commutation device to transmit signals from LUs to the output equipment;
OU1 … OU8 – output units to synchronize actuating signals (generated by LU1 … LU8) with
operation of the peripherals which control the facility’s parameters or monitor its status.
3.1.3 Connection pattern for LUs with input sensing transducers and OUs is defined by the
user at setting the instrument’s operation parameters which allows applying the instrument’s
configuration by the most convenient operational pattern.
Notes.
1. Segmentation in the presented diagram is conventional.
2. Describingthe diagram’s elements,temperature ofthe facilityis considered asthe inputparameter, however,all
abovestated refers also to other process parameters (pressure, level, etc.).
Section 3 Instrument Design and Operation

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TRM138
3.2 Block Diagram Elements
3.2.1 Input Sensing Devices
3.2.1.1 Input sensing devices (transducers) convert physical properties of the facility to
electrical signals transmitted to the instrument for their further processing. Data on sensing
devices used with instruments of various modifications are presented in Table 2.
3.2.1.2 Resistive temperature transducers (RTT) are used to monitor ambient temperature at
the transducer’s location. RTT’s principle of operation is based on the conductor’s ability to change
electrical resistance when the ambient temperature is changed.
The sensing transducer shall be connected to the instrument by a threewire circuit (see
Appendix 2, Figure A2.7, a).
If the RTT connection by a twowire circuit is required, Appendix 4 shall be followed.
3.2.1.3 Thermoelectric temperature transducers (thermocouples) (TC) are also used to
monitor temperature. A TC represents a thermoelectric circuit arranged by two heterogeneous
metallic conductors with two junctions.
Junction point of heterogeneous conductors is termed as a “working” junction of thermocouple
and their ends are tails or “cold” junctions. The “working” junction of the thermocouple is placed
in a temperature monitoring location while the tails are connected to the instrument’s input pins
(see Appendix 2, Figure A.2.7, b).
ATTENTION! Only thermocouples with insulated and unearthed working junctions can
beused with the instrument since negative sides of their tails are merged at the TRM138 entry
point.
3.2.1.4 Active converters with analog output signal are used to monitor various physical
properties (pressure, temperature, flow rate, level, relative humidity, etc.). The exit signal of such
sensing transducers is a direct current voltage varying on the linear law or a current.
The connection diagram of the sensing transducer with a current terminal is presented in
Appendix 2, Figure A.2.7, c.
ATTENTION! “Minus” terminals of active sensing transducers in the instrument are merged.
3.2.1.5 An instrument of any modification can work with various types of sensing transducers
from those presented in Table 2 for the specified modification. When connected to the instrument,
the sensing transducers are assigned with serial numbers of the entries to which they are connected
(entry 1 corresponds to sensing transducer d1, entry 2 – sensing transducer d2, and so on). Type
of each sensing transducer is set by the user in parameter int (PL1) when the instrument is
prepared for operation (see Section 6).
Note. When the instrument’s programmed parameter is referred to, programming level number of this para
meter is indicated in brackets. A full list of programmed parameters is presented in Appendix 3.
3.2.2 Input Parameters Measuring
3.2.2.1 The instrument measures the facility’s input parameters (temperature, pressure, etc.)
by consecutive interrogation of operational sensing transducers and conversion of signals received
from them into digital values. When being processed the signals are filtered from noise and corrected.
3.2.2.2 Interrogation of Sensing Transducers
3.2.2.2.1 Sensing transducers are interrogated in a closed cycle by means of AC1 automatic
commutation device controlled by the microprocessor under the program set by the user. This
program includes the list of serial numbers of all operational sensing transducers (interrogation
list) as well as interrogation priority for each of them.
3.2.2.2.2 Any sensing transducer included in the interrogation list is switched on automatically
after its NSC type is set in int (PL1) parameter. If int (PL1) parameter is set to oFF (“switched
off”) the sensing transducer is excluded from the interrogation list.
The queue and frequency of interrogation of each sensing transducer are defined by
the interrogation priority which is set as a dimensionless numerical value (from 1 to 8)
in Prt (PL1) parameter individually for each sensing transducer. The maximum numerical
value corresponds to the highest interrogation priority.
Instrument Design and Operation Section 3

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TRM138
Section 3 Instrument Design and Operation
Example. The interrogation list includes sensing transducers: d1 (8), d3 (7), d4 (7), d5 (6),
d6 (6) and d8 (5) with appropriate priority values (in brackets). The transducers will be interrogated
in the following order: d1– d3 – d1 – d4 – d1– d5 – d1 – d3 – d1 – d4 – d1– d6 – d1 – d8 and
so on by the cycle.
Note. The interrogation algorithm with set priority values makes it possible for the user to increase frequency of
interrogation for those sensing transducers which are related to rapidly changing physical properties
thus ensuring the fastest response for their output equipment. However, it is to bear in mind that increase
in interrogation frequency of one sensing transducers shall decrease interrogation frequency of othertrans
ducers.
3.2.2.3 Input Parameters Running Values Measuring
3.2.2.3.1 Signals of sensing transducers from AC1 automatic commutation device are
transmitted to the MD measuring device entry. The MD evaluates running values of controlled
physical properties and digitizes them to provide for their further processing.
3.2.2.3.2 When resistive temperature transducers and thermocouples are used temperature
is computed by standard NSCs.
The instrument’s readings are automatically adjusted by temperature of
thermocouples’ tails. The adjustment procedure is disabled (for example, at calibration of the
instrument) by setting Cj.C (PL0) parameter to oFF.
3.2.2.3.3 When active converters (sensing transducer types “06”, “10”, “11”, “12” or “13” in
Table A3.2) are used controlled parameters’ values are computed directly in their measuring units.
Adjusting coefficients are set for each sensing transducer at identification of Ain.L (PL1)
parameters – the lower measurement limit and AinH (PL1) – the upper measurement limit.
3.2.2.4 Measurements Digital Filtering
3.2.2.4.1 To reduce impact of environmental impulse noise on the instrument’s operating
performance measurements independent digital filtering is provided for each measuring channel.
The filtering is made in two stages.
3.2.2.4.2 For the first stage the user sets “filter strip” in.FG (PL1) parameter individually
for each sensing transducer in measuring units of measured physical values. This filter is disabled
by setting 0value in in.FG (PL1) parameter.
3.2.2.4.3 For the second stage of filtering the user sets “filter time response” parameter –
in.Fd (PL1).
ATTENTION! Increase in in.Fd (PL1) parameter value provides for a better
noninterference of the measuring channel but simultaneously increases its time lag, i.e.,
reduces the instrument’s response to rapid changes of an input value. The instrument’s
response to abrupt change in arrival signal from 0.0 to 10.0% of the measured range at various
in.Fd (PL1) values is presented in Table 4 (in.FG filter isdisabled).
Table 4
Filter time response in.Fd
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Number of measurements required to reach the level
7,0 2 3 5 6 7 8 9 11 12 13 14 16 17 18 19
9,0 4 6 8 11 13 15 18 20 23 25 27 29 31 34 36
9,5 5 8 11 14 18 20 23 26 29 32 35 38 41 44 46
This filter is disabled by setting 0value in in.Fd (PL1) parameter.
Measured
value (level)

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TRM138
Digital filters operation timing waveforms are
presented in Figure 2.
3.2.2.5 Measurements Adjustment
3.2.2.5.1. To eliminate initial error effect from
primary sensing devices the filtered values of monitored
parameters are adjusted by the instrument according
to adjustment parameters and a set by the user for each
monitoring channel which allow shifting and slope
changing of conversion characteristic.
3.2.2.5.2. “Characteristic shift” adjustment is
set in in.SH parameter (default setting d = 000.0) in
measuring units of monitored parameter.
Exemplary “characteristic shift” adjustment is
schematically presented in Figure 3.
3.2.2.5.3. “Characteristic slope changing”
adjustment is set by the user for each monitoring
channel in in.SL parameter (default setting a =1.000) in
dimensionless units.
Exemplary “characteristic slope changing”
adjustment is schematically presented in Figure 4.
Note.If changing both values (dand a)for thesame sensoris
required first d value and then a value shall be set.
ATTENTION! Applying adjustment coefficients
different from default settings (d = 000.0 and a = 1.000)
will change metrological characteristics of TRM138
and should be done only if such a change is technically
reasonable, by skilled technicians.
3.2.3 Mathematical Values Computation
3.2.3.1. The instrument is able to compute, on the
basis of received resultant data, a number of mathematical values used to control the facility:
F1 – arithmetical average by parameters of 2 transducers d1 and d2;
F2 – arithmetical average by parameters of 3 transducers d1 … d3;
F3 – arithmetical average by parameters of 4 transducers d1 … d4;
F4 – arithmetical average by parameters of 5 transducers d1 … d5;
F5 – arithmetical average by parameters of 6 transducers d1 … d6;
F6 – arithmetical average by parameters of 7 transducers d1 … d7;
F7 – arithmetical average by parameters of 8 transducers d1 … d8;
А1 – difference between d1 and d2;
А2 – difference between d3 and d4;
А3 – difference between d5 and d6;
А4 – difference between d7 and d8;
r1…r8 – change rate (per minute) of a parameter monitored by transducer d1…d8
accordingly.
Note. Calculated values of r1 … r8 are recommended to be used for secondary monitoring since the posi
tional control law realized in the instrument for output equipment in most cases does not allow their adjust
ment with goodquality.
To the values of r1 … r8 filter additional smoothing filters are applied whose performance
characteristics are set in in.rd(PL1) parameter individually for each transducer.
3.2.4 Measured Parameters Indication
3.2.4.1. Information on measured values of input parameters or computed mathematical
values is displayed on a fourdigit digital indicator DI1 located on the front panel of the instrument.
The DI1 receives data only from one of eight information output channels (logic units LU1 …
LU8) at a time. Information output channels are selected by setting “LU input signal” С.in(PL2)
Instrument Design and Operation Section 3
Figure 2. Digital filters operation
timing waveforms

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TRM138
parameter of a corresponds logic unit: at setting “1” … “8” values the digital indicator receives data
on the values measured by sensors d1 … d8 accordingly; values “9” … “15” – data on mathematical
values F1 … F7 computed in accordance with Item 3.2.3; values “16” … “19” – data on values
А1 … А4; values “27” … “20” – data on values r1 … r8; when “0” value is set this LU is disabled.
3.2.4.2. Information is displayed on DI1 in a format selected by the user – as whole or fractional
numbers with specified quantity of numerals after the decimal symbol. The decimal symbol rule
is set individually for each indication channel in dP (PL2) parameter.
If the data displayed on DI1 does not fit its fourdigit indication field the instrument
automatically switches to indication of whole numbers. After the loworder digit the decimal point
is displayed meaning that the digital indicator is overfilled. The significant digits hidden as a result
of overfilling can be seen by depressing RESET / SHIFT button.
3.2.4.3. The DI1 refresh rate is set by the user in a range of 1 … 60 sec in parameter ind.r
(PL0). When “0” value is set the information is refreshed as it arrives from MD.
Note. The DI1refresh rate set by the user does not have effect on the TRM138 output equipment operation.
3.2.4.4. Data is displayed on DI1 in two indication modes: static or cyclic.
In static mode indicated channel is selected by the operator by means of control buttons
located on the front panel of the instrument and inspected by means of “CHANNEL” LED.
In cyclic mode information from each channel is displayed on DI1 successively within
specified time in a closed cycle starting from an operational channel with low priority. Spare
channels are skipped over.
Indication mode is selected in parameter ind. A (PL0): “on” – cyclic mode, “oFF” – static
mode.
The indication channel switching time is set by the user in parameter ind.t (PL0).
3.2.4.5. As a matter of convenience, when power is connected (or the microprocessor restarted)
the instrument is automatically switched to the indication mode preset by the user.
3.2.5 Logic Units
3.2.5.1. Logic units (LU) are designed to process arriving input data on values measured
(computed) by the instrument, to output these data to the digital indicator and to generate actuating
signals for the peripherals in accordance with set values of programmed parameters.
The instrument is equipped with eight identical and functionally interchangeable units
LU1 … LU8 connected by means of a special program tool customized by the user to measured
input values and output equipment.
Each LU processes only one input value set by the user in parameter С.in (PL2).
To each LU one of eight output devices of the instrument can be connected; the device’s serial
number is set by the user (for the specified LU) in parameter C.dr (PL2).
Each LU can work in one of these modes: METER; COMPARATOR (COMPARISON DEVICE) or
RECORDER.
Section 3 Instrument Design and Operation
Figure 3. “Characteristic shift”
adjustment
Figure 4. “Characteristic slope
changing”

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TRM138
3.2.5.2. In METER mode a logic unit
generates output signals to the digital indicator
based on data arriving from an MD. Actuating
signals for output equipment are not generated.
The LU is switched to METER mode by setting
AL.t (PL2) parameter to “0”.
3.2.5.3. Working in COMPARATOR mode
the logic unit compares input signal values to
preset limits and the hysteresis range values,
and generates control signals for the output
equipment.Preset limit and hysteresis range
values for a specified LU are set by the user in
accordance with parameters C.SP (PL2)
and HУSt (PL2).
LU’s output signal varies under the relay
logical law whose logic type is set in parameter
AL.t (PL2). The timing waveform of an OU’s
operation in COMPARATOR mode is presented
in Figure 5.
If a LU is used as a warning indicator
actuated when a monitored parameter goes
beyond the (AL.t = 4) limits, the LU is blocked
after energization of the comparator’s
switching device by setting the bL.St (PL2)
parameter to “on” position. The timing
waveform of the LU operation for this case is
presented in Figure 6.
To protect the commutation elements of
the output equipment and peripherals against
frequently repeated startup ”Falling delay” –
dL.on (PL2) and dL.oF (PL2) parameters.
The LU activates or deactivates related OU only
in the event that these actions are required, at
least, during the period of time set in parameters
Ht.on (PL2) and Ht.oF (PL2) accordingly.
The timing waveform of the OU operation
for this case is presented in Figure 7.
The user can set minimum holding time
for the OU (after the LU is switched) in activated
or deactivated state irrespective of the state
of input signals in Ht.on (PL2) and Ht.oF
(PL2) parameters, accordingly. The timing
waveform of the output device operation for
this case is presented in Figure 8.
3.2.5.4. Working in RECORDER mode,
the logic unit converts arriving input values
into actuating signals for the digitalanalog
converter “parameter – current” designed to
output information to peripheral logger (graph
plotter, computer, etc.).
The LU is switched to RECORDER mode
by setting AL.t (PL2) parameter to “5”.
Instrument Design and Operation Section 3
Figure 5. Comparators’ output
characteristics
Figure 7. LU operation with reaction
and falling delays
Figure 6. LU operation diagrams at various
bL.St values

13
TRM138
The conversion is made under the linear
law in a specified variation range of the input
value in accordance with lower and upper
limits set in parameters Ao.L (PL2) and
Ao.Н (PL2) accordingly.
DAC’s output characteristics in the
registration mode are presented in Figure 9.
3.2.6 Output Units
3.2.6.1. Output units (OU) are designed
to synchronize actuating signals generated
by LUs with the operations of the peripherals
engaged in regulating the facility’s
parameters or monitoring its status.
Depending on version, the instrument
can be equipped with a number of OUs
varying in purpose and operation mode: key
type (electromagnetic relay assemblies,
transistor or triac optocouples) analog type
(digital/analog converters “parameter
current”).
Connection diagrams for TRM138 with
various OUs are presented in Appendix 2.
3.2.6.2. Key type OUs are used to
control final actuating devices (heaters,
blowers, etc.) either directly, or through
control starting units with a higher
commutation capability (power starters,
contactors, thyristors, triacs, etc.) under the
positional law – “activated deactivated”.
3.2.6.3. In TRM138R instruments
electromagnetic relay assemblies are
used as OUs. These relays’ normally open
contacts are led out to exterior junction
terminals. To increase relays’ service life
their contacts (especially at commutation of
inductive loads) are recommended to be
connected in parallel with spark protection
RC circuits (Figure 10).
3.2.6.4. In TRM138R instruments
transistor optocouples of npntype
are used as OUs. These optocouples’ outlets
have galvanic insulation from the
instrument’s circuit and are led out to the
exterior junction terminals. Transistor
optocouples are used, as a rule, to control
lowvoltage solidstate or electromagnetic
relay assemblies commuting power circuits
of electric load.
ATTENTION! When optocouples are
used to control an electromagnetic relay
assembly, the latter’s winding shall be
connected in parallel with a semiconductor
diode whose parameters are selected at
Section 3 Instrument Design and Operation
Figure 8. LU operation with the preset
holding time
Figure 9. DAC output characteristics
Figure 10. Relays’ contacts connected in
parallel at operation under inductive loads

14
TRM138
the rate of: Urev.max > (2…3) Usv; Ifc max > (1.5…2) Irpc,
where Urev.max – diode maximum admissible reverse
voltage; Usv – relay assembly supply voltage; Ifc max –
diode maximum admissible forward current; Irpc – relay
assembly pickup current.
Example of transistor optocouple application is
presented in Figure 11.
3.2.6.5. In TRM138C instruments lowpower
triac optocouples are used as OUs. These
optocouples’ outlets have galvanic insulation from
the instrument’s circuit and are led out to the exterior
junction terminals. These optocouples, as a rule, are
used to control highpower thyristors or triacs commuting power circuits of actuating devices.
Control pulses are generated by triac optocouples at the moment when the circuit voltage passes
through the zero point which substantially reduces the interference level.
Examples of triac optocouple applications are presented in Figure 12 and 13.
Note. RCfilters (seeFigure 12,13) aredesigned to protect circuit components from highvoltage jumps.
3.2.6.6. TRM138I instruments are equipped with analog type output equipment designed
to convert input data in direct current signals (“parametercurrent” conversion) by means of 10
digit DACs built in the OU. Converted signals can be used for parameters’ recording (see Item
3.2.5.4).
Figure 12. Triac optocouples applications for load control by means of a power triac
Figure 13. Triac optocouples applications for load control by means
of a power thyristors
Instrument Design and Operation Section 3
Figure 11. Application of transistor
optocouple for control over
electromagnetic relay assembly

15
TRM138
3.2.6.7. The DAC shall be powered from an independent direct current source providing
galvanic insulation of the instrument’s and the user’s electrical circuit. Power source voltage is
determined by the formulas:
Ups/min
< Ups/nom < Ups/max ;
Ups/min
= 7.5 + ICAD max Rload;
Ups/max
= Ups/min + 2.5,
where: Ups/nom – power source nominal voltage, V;
Ups/min – power source minimal admissible voltage, V;
Ups/max – power source maximal admissible voltage, V;
ICADmax – DAC maximum output current, mA;
Rload – DAC load resistance, kOhm.
If on whatever reason pressure the DAC’s power source voltage exceeds design value Ups/max
than in series with the load a limit resistor shall be installed whose resistance is calculates by the
formulas:
Rlim/min <Rlim/nom
<Rlim/max ;
Rlim/min = Ups – Ups/max Rlim/max = Ups – Ups/min
IDAC/max IDAC/max
Where: Rlim/nom – limit resistor nominal value, kOhm;
Rlim/min – limit resistor minimal admissible value, kOhm;
Rlim/max – limit resistor maximal admissible value, kOhm;
IDAC/max – DAC maximum output current, mA;
Ups – DAC power source voltage, V.
ATTENTION! The DAC’s power source voltage shall not exceed 30 V.
An example of the DAC’s connection to the power source and the load is
presented on Figure 14.
To power the DAC, a builtin direct
current source for 24 V not used for active
sensors can be applied. When a builtin
powersource is used, the above requirements
shall be complied with.
3.2.7 Emergency Alarm and Warning
3.2.7.1. The instrument monitors
operability of primary converters connected
to it and at fault of any of them generates a
signal “Sensor fault” displaying on the
digital indicator messages on the fault
(description of the messages and their
reasons are presented in Table 5).
Table 5
Fault cause Message on DI2
RTT short circuit 0.0.0.0.
RTT or TC rupture    
RTT, TC or active sensor falling beyond the lower limit of the control range
(except for types 11, 12, 13 as per Table A3.2) LLLL
RTT, TC or active sensor falling beyond the upper limit of the control range НННН
TC’s tails overheating OtCL
Measuring device fault AdEr
Sensor number preset in С.in (PL2) parameter is disabled program
matically by setting int (PL2) = oFF in.oF
Section 3 Instrument Design and Operation
Figure 14. The DAC / load
connection diagram

16
TRM138
By “Sensor fault” signal all LUs related to the faulty sensor switch OUs operated by them
in states preset by the user in parameter Er.St (PL2).
3.2.7.2. The instrument monitors operability of builtin OUs and controls the units connected
to them by defining the input parameter variation value and direction with periodicity set by the user
in parameter C.Lbt (PL2). If within C.Lbt (PL2) time the input parameter data do not reach a
minimum level set in parameter C.LbА (PL2), or its variation direction does not comply with the
control order, the monitoring circuit generates a fault signal “LBA fault”. By this signal the OU
switches to the state set in parameter Er. St (PL2). The CHANNEL flashing LED is actuated where
the fault is found, while the DI1 indicator still displays information on the monitored parameter.
The DI2 displays a message on the fault cause in the form of the LBA prompt.
The signal is removed by depressing the RESET/SHIFT button.
When the LU operates in the warning indicator mode (AL.t=3, 4), the “LBA” is not generated.
C.LbА (PL2) and C.Lbt (PL2) values are generated independently for each LU. When the C.Lbt
(PL2) parameter is set to “0”, “LBA fault” signal in this channel is not generated.
3.2.7.3. If required, “Sensor fault” and “LBA fault” signals can be transmitted to one of OUs
to generate a combined signal “Fault”. Order number of the OU for the “Fault” signal processing
is set in parameter AL.dr (PL0). At AL.dr (PL0) =0 of the “0” value, fault signals are not
transmitted to the OU.
When any fault signal is transmitted to the “Fault” OU, the latter is automatically switched
to the state set in parameter AL.St (PL0) for a time period set in parameter AL.Hd (PL0). Upon
termination of the AL.Hd (PL0) time period, the OU returns in its reset state. But if the fault cause
is not eliminated the OU will transiently operate (for 1 sec) each 60 sec.
The “Fault” OU can be returned in the reset state before the termination of the set delay time
by depressing “RESET/SHIFT” button on the instrument’s front panel.
3.2.7.4. The instrument generates warning signals to notify on actuation of an OU’s in any
control channel. At that, the flashing LED of a corresponding CHANNEL is switched on without
generating a fault signal. The flashing LED is switched off automatically at the OU deactivation.
Warning alarm operation mode is set individually for each LU in L.oU (PL2) parameter: “on” value
corresponds to actuation of a warning alarm in the specified control channel, “oFF” value – to its
deactivation.
The warning alarm is used when the instrument or some of its channels act as automatic
warning indicators to monitor status of any parameters of the facility.
3.3 Instrument Design
3.3.1. Overall and installation dimensions of the instrument are presented in Appendix 1.
TRM138 instrument is made in a plastic casing designed for flush mounting on the vertical
plane of the control panel. The casing consists of two parts joined together with four screws. To
provide for heat extraction at the instrument’s operation, ventilating slots are made on lateral faces
of the back part of the casing.
The instrument is fixed to the board with two clampers included in the delivery set.
3.3.2. In the casing four printedwiring boards with the instrument’s circuit components are
located. The plates are joined together by means of flat cables fitted with plug connectors at one side.
For connection with primary sensing devices, power source and peripherals the instrument
is equipped with four groups of terminal connectors with screwed fasteners located on its back
surface. The connectors’ location diagram and their purpose are presented in Appendix 2.
3.3.3. Overall and installation dimensions of the instrument are presented in Appendix 1.
3.4 Display and Control Elements
3.4.1. On the instrument’s front panel (Figure 15) LED indicating devices are installed to display
current information on parameters and operational modes of the TRM138 instrument as well as six
buttons to control the instrument.
3.4.2. The DI1 4digit digital indicating device displays measured or computed parameter
value in the channel selected for display; at fault the indicating device displays the order number
of the faulty sensor. Two display modes (see item 3.2.4.4) are provided:
Instrument Design and Operation Section 3

17
TRM138
The DI2 4digit digital indicating device displays preset limit values for the displayed
monitoring channel; at fault the indicating device displays the fault cause in character mode.
The DI3 2digit digital indicating device displays the order number of an input unit
connected to the specified channel (for example, “d1” sensor).
The DI4 2digit digital indicating device displays the number of an output unit connected
to the channel.
The “К1” LED is switched on at actuation of the OU assigned for displayed monitoring channel
(only for key type OUs).
The “STOP” LED is switched on in the static display mode.
3.4.4. The and buttons are to select the display channel in the static mode as well as
to control the OU manually.
The button is to switch the instrument in the PROGRAMMING mode.
The button is to stop operation of a faulty OU as well as to shift information on the upper
indicating device at overfilling.
The button is to switch a selected LU to MANUAL CONTROL mode as well as to return
the instrument from the PROGRAMMING mode to OPERATION mode.
The button is to switch the instrument’s display mode from static to cyclic.
DI1
DI2
DI3
DI4
Figure 15. Instrument front panel
3.4.3. “CHANNEL 1...8” LEDs in steady lighting mode indicate the number of LU whose
parameters are currently a displayed, in flashing mode warn on a fault in the specified monitoring
channel or actuation of the warning alarm in it.
Section 3 Instrument Design and Operation

18
TRM138
4.1 TRM138 instrument is referred to protection class 0 as per GOST 12.2.007.0 75.
4.2 The instrument shall be operated and maintained in compliance with the requirements of
GOST
4.3 12.3.019 80 Rules of Operation of User Electrical Equipment, Safety Rules at Operation of
User Electrical Equipment.
4.4 Open contacts of the instrument’s terminal block in operation are alive thus posing threat
for human life. Installation of the instrument shall be performed inside of special boards accessed
only by skilled technicians.
4.5 Any connections to TRM138 and operations on its maintenance shall be performed only
after deenergization of the instrument and its operating units.
Safety Measures Section 4

19
TRM138
5.1. Installation of the Instrument
5.1.1. Prepare a mounting face on the control panel for installation of the instrument, see
Appendix 1. The control panel design shall ensure protection of the instrument against penetration
of moisture, dirt and outside objects.
5.1.3. Install TRM138 on the control panel by means of the fasteners included in the delivery set.
Note. Before installing the instrument it is recommended to configure the circuit to set programmed para
meters of the instrument according to Item 6.1.
5.2. Installation of External Communications
5.2.1. General Requirements
5.2.1.1. The instrument is recommended to be powered from a source not related to highpower
equipment. In the exterior circuit a power switch shall be provided to cutoff of the instrument, and
safety fuses for 1.0 A.
Connection of feeders from any equipment to the instrument’s power contacts is not allowed.
ATTENTION! The instrument’s terminal connectors designed for power and exterior
equipment connections are rated for the maximum voltage of 250 V. In order to prevent
electrical breakdown, connection of sources with higher voltage to the instrument’s contacts
structurally integrated in one group (1...14 or 45...54) is not allowed. For example, operating
within a threephase circuit 380/220 V, connection of different power supply voltage phases
to corresponding contacts from group 1...14 is not allowed.
5.2.1.2. Connection of the instrument to input resistive temperature transducers shall be
performed by means of a threewire line whose strands have equal resistance relative to each other.
The communication line shall be not longer than 100 meters long, resistance of its every strand –
not higher than 15.0 Ohm.
Note. Connectionof resistive temperature transducersto the instrument isallowed to be made by a twowire line
(seeAttachment 4). Thecommunication line shallbe notlonger than 100meters long,resistance of itsevery strand– not
higher than 15.0 Ohm.
5.2.1.3. Connection of the instrument to thermoelectric converters shall be made either directly
(at sufficient length of the thermocouples’ conductors) or by means of extension cables whose
grade shall meet the type of used thermocouples. Extension cables shall be connected observing
polarity directly to input contacts of the instrument. Only in this case temperature effect of
thermocouples’ free tails can be compensated. The communication link shall be not more than 20
meters long.
5.2.1.4. Connection of the instrument to active transducers shall be made by means of a
doublewire line. The communication line shall be not longer than 100 meters long, resistance of
its every strand – not higher than 50.0 Ohm.
5.2.1.5. The RS 485 interface communication line shall be made of a screened twisted pair.
The communication line shall be not longer than 800 meters long.
5.2.1.6. TRM138 is equipped with an integrated 24 V power source which shall be used to power
active transducers with analog output or the DAC’s current loops with an output current of 4…20 mA
(in view of Item 3.2.6.7) in appropriate modifications of the instrument.
ATTENTION! Using the integrated power source simultaneously for both the active transducers
and the DAC is not allowed.
5.2.2. Installation Instructions
5.2.2.1. Prepare cables for connection of the instrument to the transducers, actuating units
and peripherals, and to the power source.
To provide for reliable electrical connections cables with copper stranded conductors are
recommended to be used; the cables’ ends shall be carefully stripped and tincoated before the
connection. Cables’ strands shall be stripped so that their bare ends remained within the terminal
block after connection to the instrument.
The cable strands’ section area shall not exceed 0,75 mm2.
5.2.2.2. Installing the cables, individual communication line (or a number of lines) shall be
provided to connect the instrument to the transducers; the lines shall be laid separately from power
cables as well as cables which generate highfrequency and impulse noise.
Section 5 Onsite Installation