4 1
TRM138
A5.1. General
A5.1.1
Adjustment of TRM138 is reduced to several procedures ensuring restoration of its
metrological performances if they were changed in the course of operation.
ATTENTION!
The necessity of adjustment must be determined based on the instrument
inspection and to be performed by qualified metrologists only, authorized forinspection.
A5.1.2.
The adjustment operations will be carried out with the use of reference signal sources
connected instead of transducers and simulating their operation at contacts “Input 1” of the
instrument. In the course of the adjustment the instrument calculates relations between the input
signals received and the signals of the corresponding reference points of the circuit. The calculated
ratios (adjustment ratios) are recorded to volatile memory and will be used as the basic values for
further calculations.
The results obtained during adjustment of input 1, will be automatically transmitted to all
inputs of the instrument.
A5.1.3.
If for any reason the calculated value exceeds the instrument operation limits,
the
DI4
indicator will display “
Gt
” message. If this message is displayed, ensure the signal
source connected to “Вход 1” (“Input 1”) contacts corresponds to the predetermined type
of the sensing device, also check proper circuit connections and the value of the signal set
for the adjustment procedure. The troubleshooting completed, repeat the adjustment
procedure.
A5.1.4.
Individual adjustment is carried out for the following groups of sensing devices:
– resistive temperature transducers Cu and Cu with R
0
= 50.0 Ohm;
– resistive temperature transducers CRTT and CRTT with R
0
= 100.0 Ohm;
– thermal couples of TXK)L), TXA(K), THH(N), TJK(J) types, as well as active transducers with
0…50.0 mV output signal;
– thermal couples of R, S, A10 types;
– active transducers with 0…1.0 V output signal;
– active transducers with 0…5.0 mV output signal;
– active transducers with 0…20.0 mV and 4…20.0 mA output signal.
The coefficients obtained after adjustment of one sensing device from the selected group will
be automatically transmitted to the rest devices of the same group.
Except the groups of the sensing devices, there also provisioned adjustment of the instrument’s
free ends temperature transducers, as well as adjustment of output digitalanalog converters
“parametercurrent” (only for modifications of the instrument when DAC operates as OU).
Note
. It is practical to adjust only those groups of sensing devices that are used in operation.
A5.1.5.
Prior to adjustment set
“0,0”
correcting value for
dat1
transducer in
in.SH (PL1)
parameter, and “
1.000
” in
in.SL (PL1)
parameter.
A5.1.6.
During adjustment procedures observe safety measures specified in A4.
A5.2. Adjusting the instrument for operation with transducers CRTT 50 M and PRTT 50P
A5.2.1.
Instead of the transducers connect the MSR63 type (or with similar characteristics
and accuracy class not less than 0.05) resistance box to the instrument’s “Вход 1‘ (“Input 1”)
contacts, set 50.00 Ohm at the resistance box. The
instrument to be connected to the resistance box over
a threewire circuit as per figure A5.1. The wire
resistance must be the same and not exceed
15.0 Ohm.
A5.2.2.
Power on the instrument and set any of
the following values:
“01”, “07”, “08” or “09”
for
transducer
dat 1
in parameter
int (PL1)
, these
values correspond to the numerical code of operation
of TRM138 with one of the specified sensing devices.
Appendix 5
Instrument Adjustment
Figure A5.1. Connection diagram for
resistance box during adjustment
Содержание TPM138
Страница 23: ...22 TRM138 Setting up Procedures Section 6 Figure 16 Programmed parameters setting diagram...
Страница 24: ...23 TRM138 Section 6 Setting up Procedures...
Страница 30: ...29 TRM138 Appendix 1 Dimensional drawing...
Страница 31: ...30 TRM138 Instrument connection Appendix 2 Figure A2 1 Instrument terminal block contacts arrangement diagram...
Страница 35: ...34 TRM138 Figure A2 10 Example of connection of various type transducers Instrument connection Appendix 2...
