Proservo NMS81
Endress+Hauser 13
A
B
17 (0.67)
46.6 (1.83)
1 (0.03)
90 (3.54)
Ø70(2.76)
a
a
67 (2.64)
26 (1.02)
2 (0.07)
10 (0.39)
Ø110 (4.33)
A0029582
A ⌀70 mm (2.76 in) 316L conical displacer
B ⌀110 mm (4.33 in) 316L conical displacer
a Immersion point
Item ⌀70 mm (2.76 in) 316L conical displacer ⌀110 mm (4.33 in) 316L conical displacer
Weight (g) 245 223
Volume (ml) 124 108
Balance volume (ml) 52.8 36.3
The weight, volume, and balance volume are individually determined by each displacer and also
might vary depending on the values stated above.
Recommended displacer by application
Application Product level Interface level Density
Viscous liquid 50 mm (1.97 in) PTFE Not Recommended Not Recommended
Crude oil 50 mm (1.97 in) 316L
50 mm (1.97 in) PTFE
50 mm (1.97 in) 316L
50 mm (1.97 in) PTFE
50 mm (1.97 in) 316L
50 mm (1.97 in) PTFE
Black oil 50 mm (1.97 in) 316L 50 mm (1.97 in) 316L 50 mm (1.97 in) 316L
White oil 70 mm (2.76 in) 316L 70 mm (2.76 in) 316L 70 mm (2.76 in) 316L
Liquefied gas, LPG/LNG 70 mm (2.76 in) 316L 70 mm (2.76 in) 316L 70 mm (2.76 in) 316L
Corrosive liquid
50 mm (1.97 in) Alloy C
50 mm (1.97 in) PTFE
50 mm (1.97 in) Alloy C
50 mm (1.97 in) PTFE
50 mm (1.97 in) Alloy C
50 mm (1.97 in) PTFE
Product level
In general, larger diameter displacers have better accuracy under similar conditions.
Interface level(s)
Cylindrical-shaped displacers, with rounded top and bottom, reduce resistance while moving through
liquid(s). This provides smoother movement and faster interface measurements compared to flat-
faced displacers, particularly in density profile measurements that span the full tank height.
In order to move a displacer down through liquids, the displacer density (weight divided by
volume) must be higher than the liquid density.
Tank bottom and datum plate level
70 mm (2.76 in) and 50 mm (1.97 in) displacers reduce resistance while moving through liquids.
This provides smoother movement and faster interface measurements.
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