JUMO 60.1540 User Manual

JUMO GmbH & Co. KG

Delivery address: Mackenrodtstraße 14

36039 Fulda, Germany

Postal address:

36035 Fulda, Germany
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.jumo.net

JUMO Instrument Co. Ltd.

JUMO House
Temple Bank, Riverway
Harlow, Essex CM20 2DY, UK
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.jumo.co.uk

JUMO Process Control, Inc.

6733 Myers Road
East Syracuse, NY 13057, USA
Phone: [phone]

1-800-554-5866
Fax: [phone]
E-mail: [e-mail]
Internet: www.jumousa.com

Flue gas temperature monitor

Type STM-RW-2

Special features

• with micro switch

• Aluminum die cast case

• Protection rating IP54

• High contact reliability

Brief description

The flue gas temperature monitor is used to monitor the flue gas temperature of solid fuel boilers
during bivalent operation with oil heating boilers. Furthermore it is used to block ventilation sys­tems causing vacuum in connection with tile stoves and fireplaces.

The flue gas temperature monitor operates according to the rod expansion principle. The im­mersion tube and an integrated metal rod have different expansion coefficients so that a tem­perature-dependent length difference occurs. A micro switch, which is actuated when a set limit
value temperature is exceeded, is affected due to mechanical transmission. The micro switch
is reset once the immersion tube has cooled down by approx. 10-30 K. In the event of an im­mersion tube breakage, the current circuit will be permanently opened.

Data Sheet 601540

Page 1/4

Approval / approval marks (see Technical Data)

2013-04-09/00073204

Data Sheet 601540 Page 2/4

JUMO GmbH & Co. KG

Delivery address: Mackenrodtstraße 14

36039 Fulda, Germany

Postal address:

36035 Fulda, Germany
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.jumo.net

JUMO Instrument Co. Ltd.

JUMO House
Temple Bank, Riverway
Harlow, Essex CM20 2DY, UK
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.jumo.co.uk

JUMO Process Control, Inc.

6733 Myers Road
East Syracuse, NY 13057, USA
Phone: [phone]

1-800-554-5866
Fax: [phone]
E-mail: [e-mail]
Internet: www.jumousa.com

Technical data

Electrical data STM-RW-2 STM-RW-2/OS (729)

Switching element Micro switch with change-over contact Micro switch with 2 separate current circuits

maximum
permissible contact rating

AC 230 V +10%, 10 (2) A, cos ϕ = 1 (0.6)

DC 230 V +10%, 0.25A

Contact reliability To ensure high switching reliability, we recommend a minimum load of:

AC / DC 24 V, 20 mA
Rating surge voltage 2500 V (via the switching contacts 400 V)
Overvoltage category II Required fusing, see maximum switching current

Operating data

Limit value range +40 °C to +120 °C (factory-set to +100 °C)

+20 °C to +400 °C (factory-set to +120 °C)

Hysteresis Limit value range STM-RW-2 STM-RW-2/OS (729)

Switching point accuracy
referring to the switch-off
point

+40 °C to +120 °C
+20 °C to +400 °C

Limit value range Scale beginning Scale end

+40 °C to +120 °C
+20 °C to +400 °C

10 - 18 K
10 - 22 K

+0/-10 K

+0/-15 K
Time constant Flue gas: ≤ 45 sec.
Average

ambient temperature influ-

Switching point offset referring to the deviation of +22 °C ~ 0.07 K/K

ence

Te mp e ra tu r es / Position STM-RW-2
Permissible

ambient temperature

on the probe:

on the switch head:

max. +700 °C

max. +80°C, min. -50°C
Set point adjustment after removal of the case lid via internal scale
Permissible storage tempera-

max. +80°C / min. -50°C

ture
Rated position as per DIN 16257, NL 0 to NL 90 (different rated positions (NL) on request)

Case

Case Aluminum die cast, surface with impact resistant textured paint; lid: RAL 7032, bottom section: RAL 7015
Cable inlet clamping gland M 20 × 1.5
Protection class EN 60 529-IP54
Weight approx. 0.8 kg

Process connection

Connection type "DZ“ G 1/2 (fixed hexagon with external thread G 1/2), material: Steel
Immersion tube 15 x 150 mm, Material: Steel

1 x N/C contact and 1 x N/O contact

10 - 30 K
10 - 40 K

+0/-10 K
+0/-20 K

Approvals/Approval marks

Approval marks Inspection authority Certificates / Inspection

number

DIN EN 14597 DIN CERTCO / TÜV Süd ATW 862 DIN EN 14597 STM-RW-2

2013-04-09/00073204

Inspection basics valid for