Flowserve NRG211-1 Level Probe - Manual (Page 16)

16
Table 1 Measuring voltages
Measuring voltage U
M
Decoding NRS 2-4 Decoding NRS 2-5
≤
0 V – 1 V Malfunction in probe Malfunction in probe
supply line (short circuit supply line (short circuit
or interruption) or interruption)
= 1 V – 4 V Probe exposed / fluid Probe submerged
temperature
≥
395 °C
= 4 V – 7 V Probe submerged, Probe exposed,
HIGH
level
LOW
level
≥
9 V Malfunction in probe Malfunction in probe
(defective insulating seal, (defective insulating seal,
leaky stuffing box) leaky stuffing box)
Check resistance thermometer
1. Check the built-in resistance thermometer Pt 1000 and the measuring voltage
for
ELECTRODE EXPOSED
. Lift the retaining clip and remove the upper part of
the connector . Fig. 3
2. Remove screw and connector insert .
3. Completely unscrew cable gland and slip it over the cable .
4. Pull out the sensor supply cable for the thermometer and connect the ohmmeter.
Fig. 4
5. The setpoint to be measured depends on the plant temperature, see table 2
RESISTANCE VALUES
.
6. Check measuring voltage: it must be within 1 – 4 V DC (electrode exposed)
7. Reconnect the sensor supply cable.
8. Fix connector insert with screw , screw in cable gland and tighten.
9. Put upper part of the connector into lower part of the connector and lock by
means of retaining clip .
Table 2 Resistance values
Mean values of 100 °C ranges
°C 0 10 20 30 40 50 60 70 80 90 100
Ω
/°C 1
10 0 1000.0 1039.0 1077.9 1116.7 1155.4 1194.0 1232.4 1270.7 1308.9 1347.0 1385.0 3.85
100 1385.0 1422.8 1460.6 1498.2 1535.7 1573.2 1610.1 1647.6 1684.7 1721.6 1758.4 3.73
200 1758.4 1795.1 1831.7 1868.2 1904.6 1940.8 1977.0 2013.0 2048.8 2084.6 2120.3 3.61
300 2120.3 2155.8 2191.3 2226.6 2261.8 2296.9 2331.9 2366.7 2401.5 2436.1 2470.6 3.50
400 2470.6 2505.0 2539.3 2573.4 2607.5 2641.4 2675.2 2708.9 2742.5 2776.0 2809.3 3.38
500 2809.3 2842.6 2875.7 2908.7 2941.6 2974.3 3007.0 3039.5 3072.0 3104.3 3136.5 3.27
600 3136.5 3168.6 3200.5 3232.4 3264.1 3295.7 3327.2 3358.6 3389.9 3421.0 3452.1 3.15
700 3452.1 3483.0 3513.8 3544.5 3575.1 3605.5 3635.9 3666.1 3696.2 3726.2 3756.1 3.04
800 3756.1 3815.5 3815.5 3845.0 3874.5 3903.8 – – – – – 2.95
G
H
R S
Q P
S R
G
H
Q
I