Danfoss STM safety temperature monitor (self-acting), limit range 20 – 75 °C, sensor 210 mm × Ø16 mm, capillary 5 m, sensor connection M22X1 / R 3/4 ext. thread acc. DIN 2999, PN 25, for AVQT/AVQMT/VG(S) self-acting valves

Danfoss STM (065-0609) — self-acting safety temperature monitor, PN 25. The STM is a self-acting safety temperature monitor working on the liquid-expansion principle: the temperature sensor, capillary tube and bellows are liquid-filled, and on rising temperature the liquid expands and closes the valve, protecting the system against exceeding temperatures. It is type-tested to EN 14597 (STW 871). It comprises a temperature sensor (210 mm × Ø16 mm), a 5 m capillary tube and a bellows element; the sensor is fitted into the pipe via a sensor pocket with connection M22x1 / R 3/4 ext. thread acc. DIN 2999. Fixed limit-temperature setting range 20 – 75 °C. Gain Ks 0.3; time constant 100 s; maximum media temperature at the sensor 125 °C; ambient temperature 0–70 °C. Mounts on Danfoss AVQT / AVQMT flow-and-temperature controllers and VGS steam valves (and combines with an AVT actuator on STM/AVT/VGS arrangements) for over-temperature safety in district-heating, hot-water and steam systems up to 200 °C. Temperature sensor and impulse (capillary) tube Copper (mat. No. 2.0090); sensor pocket Brass. Type test DIN EN 14597:2005-12 STW871. Sensor connection M22x1 / R 3/4 ext. thread acc. DIN 2999. OEM P/N 065-0609. EAN 5702421544310. Technical data quoted verbatim from store.danfoss.com (code 065-0609) and the Danfoss "Temperature controller AVT with safety temperature monitor STM / VGS (PN 25)" data sheet.

Code number

065-0609

Type

STM

Product group

Actuators - Temperature

Function

Safety temperature monitor (closes on rising temperature; liquid-expansion principle)

Limit temperature range

20 – 75 °C

Pressure class

PN 25

Sensor length

210 mm

Sensor diameter

16 mm

Capillary tube length

5 m

Sensor connection

M22x1 / R 3/4 ext. thread acc. DIN 2999

Gain Ks

0.3

Time constant

100 s

Max. media temperature at sensor

125 °C

Ambient temperature

0 - 70 °C

Transport temperature

-20 - 50 °C

Mounting version

Free (flow and return mounting)

Type test

DIN EN 14597:2005-12 STW871

Permissible media

Steam / circulation water / glycolic water up to 30%

Sensor material

Copper (mat. No. 2.0090)

Impulse (capillary) tube material

Copper (mat. No. 2.0090)

Sensor pocket material

Brass

EU RoHS compliance

Yes with exemptions (6(c))

REACH Candidate List substance

Lead (CAS no. 7439-92-1)

Net weight

2.676 kg

Gross weight

2.676 kg

EAN

5702421544310

Material

Temperature sensor and impulse (capillary) tube Copper (mat. No. 2.0090); sensor pocket Brass

Pressure Rating

PN 25

Temperature Range

Limit range 20 – 75 °C; max. media temperature at sensor 125 °C

HS Code

9032.10