JUMO 601530 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.

8 Technology Boulevard
Canastota, NY 13032, USA
Phone: [phone]

1-800-554-JUMO
Fax: [phone]
E-mail: [e-mail]
Internet: www.jumo.us

Rod Thermostat with Microswitch

STMA series

Special features

•With microswitch

• Aluminum diecast case

• Protection class IP 54

• High excess-temperature protection

• High response sensitivity

Data Sheet 601530

Page 1/6

Brief description

Rod thermostats with microswitches operate according to the rod-length expansion principle.
During this process, the change of the sensing-probe length (which depends on the tempera­ture) is transmitted via an internal rod (that has a smaller expansion coefficient and that is fitted
in the thermowell) to a transmission unit equipped with a microswitch in the switching head.

The thermostats of the STMA series are used, for example, in the heating and air conditioning
industries.

Rod thermostats distinguish themselves by their high excess-temperature protection that func­tions independently of the control range (maximum. +345 °C), high response sensitivity (time
constant 8 s), and negligible low-ambient temperature influence at the switching head.

When the sensing probe is damaged or bent, the thermostat changes to "Safe status“ (heater
off).

Switching function

Temperature controller TR and temperature monitor TW

If the temperature on the temperature probe exceeds the setpoint value, the microswitch is ac­tivated by the transmission mechanics and the electrical circuit is opened or closed. If the tem­perature falls below the selected setpoint (by the amount of the switching differential), the
microswitch is reset to its initial position.

Temperature limiter TB
If the temperature on the temperature probe exceeds the set limit value, the electrical circuit is
opened and the microswitch is mechanically locked. The microswitch can be manually un­locked once the temperature has dropped by approx. 10 % of the scale range.

Temperature limiter TB with extra code 574

The additional N/O contact can be used as a signal contact.

STMA-1

STMA-2

STMA types

STMA type -1 -2 -7
Switching function Temperature controller TR Temperature monitor TW Temperature limiter TB

2011-11-07/00073201

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.

8 Technology Boulevard
Canastota, NY 13032, USA
Phone: [phone]

1-800-554-JUMO
Fax: [phone]
E-mail: [e-mail]
Internet: www.jumo.us

Technical data

General information

Data Sheet 601530 Page 2/6

Control ranges °C Switching differential in °C Immersion tube length S Active immersion tube

length

Control ranges,
switching differential,

and immersion tube
length

-10 to +100
+5 to +160
0 to +300

0 to +75

4 ± 1 100 mm 100 mm

3 ± 0.7 150 mm 150 mm
+15 to +120
+5 to +160
0 to +240

0 to +80

2.5 ± 0.4 200 mm 200 mm
0 to +120
+20 to +200
+50 to +300

-80 to +100
0 to +50

1.9 ± 0.4 250 mm 250 mm
+20 to +150
0 to +200

-15 to +50
0 to +40

1.6 ± 0.4 300 mm 300 mm
0 to +80

Electrical data STMA-1 STMA-2 STMA-7 STMA-7 / 574
Switching element Microswitch with

changeover contact

Microswitch with
changeover contact

Microswitch with N/C
contact and restart lock

Microswitch with N/C con­tact, restart lock, and addi­tional signal contact

Maximum switching
capacity

230 VAC +10 %, 10 (2) A, cos  = 1 (0.6)
DC 230 V +10 %, 0.25A

Operating data

Switching point accuracy

± 1.5% of the scale range, in the scale range center, referring to the switchoff point

in %
Allowable storage

-50 to +50 °C

temperature
Allowable ambient

-40 to +80 °C

temperature when in use
Rated position According to DIN 16 257, rated position 0 to rated position 90 (different rated positions upon request)

Case

Case Aluminum diecast, surface with impact-resistant textured paint; lid: RAL 7032, bottom section: RAL 7015
Cable inlet Standard: Clamping gland M 20 x 1.5

Available at extra cost: Cable screw-connection M 20 x 1.5 according to EN 50262 CuZn

Setpoint value setting STMA-1 STMA-2 / STMA-7

Switching point adjustable from the outside using the
rotary knob

Switching point adjustable with a screwdriver once the

case lid has been removed
Protection type EN 60 529-IP 54
Weight Approx. 0.65 kg

Process connection Version Mate rial
Plain cylindrical probe Collar Ø 19 mm between case and sensing probe

CuZn

(extra codes 574, 715, 764 can be retrofitted)

Screw-in sleeve Thermowell as a screw-in sleeve, screw-in spigot shape A according to

DIN 3852/2 with fixing screw, immersion tube Ø 12 mm

Up to 150 °C CuZn, nickel plated /

As of150 °C CrNi
Extra code 715 Loose screw-connection M 18 x 1 with counter nut CuZn nickel plated
Extra code 764 Mounting flange Sheet steel, galvanized
Fixed screw-connection With hexagon, width across flats 27, thread G1/2 CuZn nickel plated
Probe Diameter 9 mm CuZn nickel plated
Insertion length S 100, 150, 200, 250, and 300 mm

2011-11-07/00073201