The high quality and reliable Multiple Spot Thermometer (MST) measures temperature with a number of PT 100 spot elements placed at different heights to provide a tank temperature profile and an average temperature.
Only the fully immersed elements are used to determine product temperature.
The spot elements are placed in a flexible gas tight protection tube made from convoluted stainless steel.
A flange can be attached to a top fitting and the tube can be anchored to the bottom.
The MST is easy to install, even if the tank is in service. In pressurized tanks the MST can be installed in a closed thermowell so that it can be removed for service or inspection while the tank is in operation.
For LPG tanks, single spot temperature sensors in thermowells are used.
Temperature sensors can be connected in two ways
to the RTG:
Directly into the RTG with common return connection
(up to six temperature elements).
Via the DAU (up to 14 temperature elements).
A water bottom sensor or a junction box can be integrated in the MST.
Technical Data
Technical data for Multispot Thermometer
Element type:
Pt 100 spot elements according to EN 60751.
Accuracy:
1/6 DIN Class B (standard), 1/10 DIN Class B (option)
Overall temperature range (standard):
-50 to + 120 °C (-58 to + 248 °F).
Overall temperature range (optional):
-20 to + 250 °C (-4 to + 482 °F),
-170 to + 100 °C (-274 to + 212 °F).
Number of elements:
6 elements per MST as standard and 14 as maximum.
Overall length:
0.95-70 m (3.1-230 ft).
Sheath diameter:
3/4 in. (standard), 1 in. (always with WLS).
Top fitting:
Steel pipe with M25 x 1.5 or 1/2-in. BSP thread.
Thread length 253 mm (10.0 in.).
Tank opening:
Min. Ø 2 in. (50.8 mm).
Outer material:
Stainless steel, AISI 316.
Flange (option):
1½ to 4 in.
Lead wire length:
3 m (9.8 ft). Longer wires optional, max 10 m (32.8 ft).
No of wires:
3 independent wires per element or 1 wire per element plus 2 common return wires.
Bottom weight:
2.5-15 kg (5.5-33 lbs). 2.5-4 kg (5.5-9 lbs) for still-pipe installation.
Connection to Rex system:
Max 14 elements via DAU or max 6 elements with common return directly to Rex gauge (max 3 elements with independent wires).
Designed according to:
IEC 751 and ATEX directive 94/9/EC.
Technical Data for
Single Spot Temperature Sensor - LPG tanks
Element type:
PT 100, 1/6 DIN Class B or optional 1/10 DIN Class B, 3-wire.
Temperature range (standard):
-50 to + 260 °C (-58 to + 500 °F).
Sheath:
8 mm (0.31 in.), 9 mm (0.35 in.), or 11 mm (0.43 in.) outer diameter.
Sheath material:
Stainless steel, AISI 316TI.
Mounting thread:
1/2-in. NPT or BSP thread.
Standard length:
500 mm (20 in.).
Thermowell:
16 mm (0.63 in.) outer diameter as standard.
Thermowell material:
Stainless steel, AISI 316TI.
Designed according to:
IEC 751 and ATEX directive 94/9/EC.