Page.
6
/
12
Doc. no. : HTMF_Kor_2016, Rev. 0
Issued date : 2016. 11
HITROL Co., Ltd
3.4
Connect a multimeter to the output end of the F/T for measuring DC of 4
–
20 mA.
3.5
The wiring of the power voltage cable shall be installed separately from the signal cable
that extends from the F/E. When it is inevitable to use a same conduit or duct, take care to
ensure a complete electronic shield.
3.6
In a functional test, it is allowable to utilize a decade resistance box and a detection sensor
simulator that conforms to the specifications values same with those of the sensor, replacing the
actual F/E.
3.7
For the heater part of the detection sensor, it is allowable to use dummy load which
conforms to the same specifications.
3.8
For the functional test, the detailed wiring shall be as follows:
3.8.1
Connect the power to terminals AC1
–
AC2 of the terminal block.
3.8.2
Connect the sensors:
1) Connect Sr1 to the terminals R1-1, R1-2, and R1-C of the terminal block.
2) Connect Sa1 to the terminals A1-1, A1-2, and A1-C of the terminal block.
3) Connect San to the terminals An-1, An-2, and An-C of the terminal block.
3.8.3
Connect the
digital multimeter to the terminals O1-1 (+), and O1-2 (
−
)
of the
terminal block.
4. Checkpoint for Functional Test
4.1
Check the testing instruments.
4.2
Check the calibration period of the testing instruments.
4.2.1
Simulator
Check that it satisfies the resistance range, and that its calibration period has not expired.
4.2.2
Multimeter
Check that its calibration period has not expired.
4.3
Check the F/E
Check the resistance values of the sensors and the heater.
4.3.1
Resistance range of the sensors and the heater
1)
R
A
: 1,000 Ω = 0℃, ∴ △3.76 Ω/℃ (e.g., 20℃ = 1,075.2 Ω ± 1%)
2)
R
R
: 1,000 Ω = 0℃, ∴ △3.76 Ω/℃ (e.g., 20℃ = 1,075.2 Ω ± 1%)
3)
Heater : 220 Ω ± 1%
4.3.2
Check the output current of the heater.
Apply power to the F/T (warm-up: 20 minutes), connect the multimeter to the output
terminals, and measure the output current for checking that it is 75 mA ± 1%.
