Flowserve NRG211-1 Level Probe Bedienungsanleitung PDF herunterladen (Seite 16)

Table 1 Measuring voltages

Measuring voltage U

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 102030405060708090100Ω/°C

100 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

S R

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Flowserve NRG211-1 Level Probe Bedienungsanleitung Seite 16