Flowserve NRG211-1 Level Probe User Manual

Page 16

Table 1 Measuring voltages

Measuring voltage U

Decoding NRS 2-4

Decoding NRS 2-5

≤

0 V – 1 V

Malfunction in probe

supply line (short circuit

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

(defective insulating seal,

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

100

Ω

/°C

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