Danfoss MBT 3250 Data sheet

Data Sheet

Temperature sensor

Type MBT 3250

Heavy-duty industrial temperature sensor.

Heavy-duty temperature sensors for controlling cooling water, lubrication oil, hydraulic oil and refrigeration plants within general industry and marine applications.

On a standardized Pt 100 or Pt 1000 element, which gives a reliable and accurate measurement. The sensor can also be delivered with NTC / PTC elements on request.

The MBT 3250 with changeable measuring insert is equipped with EN 175302-803-A Pg plug as standard.

The measuring insert is based on a silicone cable, which makes the sensor very resistant towards vibrations.

Features:

• Gaseous or liquid media, e.g. air, gas, vapour, water or oil

• Up to 200 °C media temperature

• Pt 100 or Pt 1000 sensing element

• 1 or 2 elements

• Can be used with 2 or 3 wire connections

• Gold plated male and female connector

• With interchangeable measuring insert

AI216786443991en-000201

Temperature sensor, Type MBT 3250

Product speci€cation

Technical data

Table 1: General data

	Features	Description
	Measuring range	-50 – 200 °C
	Sensing element	1 or 2 x Pt 100, 1 or 2 x Pt 1000
	Protection tube	ø8 × 1 mm
	Permissible media velocity	Air	25 m/s
		Water	3 m/s

Table 2: Connection

	Process connection	G ¼	G ¼ A	G ¾ A
			G ³⁄ A – M18	M24
	Max. tightening torque	25 Nm	50 Nm	100 Nm

Table 3: Response time

				Indicative response times
	Type	Protection tube		Water 0.2 m/s		Air 1 m/s
			t0.5	t0.9	t0.5	t0.9
	MBT 3250 with interchangeable measuring insert	ø8 × 1 mm	9 s	33 s	95 s	310 s

Table 4: Mechanical and environmental speci€cations

	Features	Description
	Sensor tolerance	EN 60751 Class B: ± (0.3 + 0.005 × t)	t = temperature of medium, numerical value
	Vibration stability	Shock:	100 g / 6 ms
		Vibrations:	4 g sine function 5 – 200 Hz, measured acc. to IEC 60068-2-6
	Enclosure	IP65 according to IEC 60529
	Cable entry EN 175301-803	Pg 9, Pg 11 or Pg 13.5

Table 5: Materials

Features	Description
Protection tube in contact with media	W.no. 1.4571 (AISI 316 Ti)
Process connection	W.no. 1.4404	(AISI 316 L)
Extension length	W.no. 1.4571	(AISI 316 Ti)
Union	Nickel plated brass
Gasket	Silicone
Plug En 175301-803	PA 6.6 (max 125 °C)

Table 6: Max. temperature and load

Max. temperature (Ext. length “None”) Plug EN 175301-803	Max. load on protection tube (ø8 × 1, ø10 × 2) acc. to EN 175301-803
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L	Insertion length		Tp	Temperature for electric plug
Tm	Media temperature		TA	Ambient temperature
© Danfoss | Climate Solutions | 2021.02				AI216786443991en-000201 | 2