Emerson clôture pour animaux de compagnie 54ea Manuel

Manuels PDF
114 Pages Français

Emerson clôture pour animaux de compagnie 54ea
MODEL 54eA SECTION 15.0
TROUBLESHOOTING
15.14 SIMULATING TEMPERATURE
15.14.1 General.
The 54eA controller accepts either a Pt100 RTD (for pH,
499ADO, 499ATrDO, 499ACL-01, 499ACL-02, 499ACL-03,
and 499AOZ sensors) or a 22k NTC thermistor (for Hx438
and Gx448 DO sensors and most steam-sterilizable DO
sensors from other manufacturers). The Pt100 RTD is in a
three-wire configuration. See Figure 15-4. The 22k ther-
mistor has a two-wire configuration.
15.14.2 Simulating temperature
To simulate the temperature input, wire a decade box to the
analyzer or junction box as shown in Figure 15-5.
To check the accuracy of the temperature measurement,
set the resistor simulating the RTD to the values indicated
in the table and note the temperature readings. The meas-
ured temperature might not agree with the value in the
table. During sensor calibration an offset might have been
applied to make the measured temperature agree with a
standard thermometer. The offset is also applied to the
simulated resistance. The controller is measuring tempera-
ture correctly if the difference between measured tempera-
tures equals the difference between the values in the table
to within ±0.1°C.
For example, start with a simulated resistance of 103.9 Ω,
which corresponds to 10.0°C. Assume the offset from the
sensor calibration was -0.3 Ω. Because of the offset, the
analyzer calculates temperature using 103.6 Ω. The result
is 9.2°C. Now change the resistance to 107.8 Ω, which cor-
responds to 20.0°C. The analyzer uses 107.5 Ω to calcu-
late the temperature, so the display reads 19.2°C. Because
the difference between the displayed temperatures
(10.0°C) is the same as the difference between the simu-
lated temperatures, the analyzer is working correctly.
Temp. (°C) Pt 100 (
ΩΩ
) 22k NTC (k
ΩΩ
)
0 100.0 64.88
10 103.9 41.33
20 107.8 26.99
25 109.7 22.00
30 111.7 18.03
40 115.5 12.31
50 119.4 8.565
60 123.2 6.072
70 127.1 4.378
80 130.9 3.208
85 132.8 2.761
90 134.7 2.385
100 138.5 1.798
FIGURE 15-4. Three-Wire RTD Configuration.
Although only two wires are required to connect the RTD
to the analyzer, using a third (and sometimes fourth) wire
allows the analyzer to correct for the resistance of the
lead wires and for changes in the lead wire resistance
with temperature.
FIGURE 15-5. Simulating RTD Inputs.
The figure shows wiring connections for sensors con-
taining a Pt 100 RTD. For sensors using a 22k NTC ther-
mistor (Hx438 and Gx448 sensors), wire the decade box
to terminals 1 and 3 on TB6.
103
Manuels Connexes pour Emerson clôture pour animaux de compagnie 54ea
P/N 400518-02
Emerson clôture pour animaux de compagnie P/N 400518-02

Pour clôture pour animaux de compagnie (178 Pages)