JUMO ETH-20, ETH-70 Operating Manual

H

Please read these operating instructions before placing the
instrument in service. Keep the manual in a place which is accessib le
to all users at all times. Please assist us in improving these operating
instructions where necessary. Your comments will be appreciated.
Telephone [phone]
Fax [phone]

H

All necessary settings and manual changes within the device (if
required) are described in these operating instructions. If any
difficulties should nevertheless arise during startup, please do not
manipulate the unit in any way. By doing so, you could endanger
your rights under the instrument warranty! Please contact the
nearest subsidiary or the head office in such a case.

H

The instruments are maintenance-free. In the event of malfunction,
please return the instrument to the supplier with precise details of
the fault. The staff at our field offices, branches, and agencies are
always available to provide service and advice.

JUMO GmbH & Co. KG

Company address: Moritz-Juchheim-Strasse 1

36039 Fulda, Germany

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 Mess- und Regelgeräte Ges.m.b.H.

Pfarrgasse 48, 1232 Vienna, Austria
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.jumo.at

JUMO Mess- und Regeltechnik AG

Laubisrütistrasse 70, 8712 Stäfa, Switzerland
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.jumo.ch

1.

Introduction / Application

ETH series fitted thermostats are approved as:

■ safety temperature limiters (STB).

■ safety temperature monitors STW (STB)

■ Type examination to:

- DINEN14597

- Pressure Equipment Directive 97/23/EC

Safety instructions

Physical and toxicological properties of substances which may escape,
should the system fracture:

H

Fitted thermostats of type series ETH comply with VDE 0631.

End of scale Danger-

ous
reac­tions

Fire/

explosion hazard

Water

contami

nation

Tox ic o lo gy

Ignition

tempera-

ture

°C

Explosion

limit

% v/v

irri­tant

danger

to health

toxic

liquid-filled

≥

+200°C < +200 °C no +355 °C 0 .6 - 8 yes yes

1

no

≥

+200 °C ≤+350 °C no +490 °C - - yes yes

1

no

gas-filled

≥

+400 °C ≤+500 °C no

H

1

Should the measuring system fracture, the fill fluid may escape. At

present, there is no restrictive statement from the health authorities
concerning danger to health in the event of short-t erm exposure at low
concentration, for example, should the measuring system fracture.

2. Instrument identification / type
declaration

Type designation

Nameplate

(reference example)
(1) Type
( 2 ) Order code
( 3 ) Limit value/max. housing

temperature/contact rating

( 4 ) Manufacturing number/

sales number

( 5 ) Mark of approval/

connection diagram
( 6 ) Year of manufacture
( 7 ) Week of manufacture

ETH . - . . /
ETH Fitted thermostat with microswitch

with capillary

-20 safety temperature monitor STW (STB),
with changeover contact

-70 Safety temperature limiter (STB)
with break contact and restart lockout

/au gold-plated snap-action switch contact

/U only with STB. microswitch with normally-closed

contact, restart lockout, and
additional signal contact

B 60.2010.0

Operating Manual

2009-03-06/00073781

3. Mounting / general information

Capillary / temperature probe / pocket

General information

■

If the capillary of the surface-mounting thermostat is cut through or becomes

kinked, this could result in permanent dev ice failure!

■

The minimum bending radius allowed for the capillary is 5 mm.

■

JUMO pockets must be used when installing the temperature probe, if the approval

for the surface-mounting thermostat is to remain valid.

■

The temperature probe must be fully immersed in the measurement medium.

■

When air is the measurement medium, you must choose a process connection

without a pocket.

■

To ensure the general accuracy of the operating value, the instruments must only

be used with the pockets supplied on delivery (diameter D = 8, 10 mm).

■

Only a probe of diameter d = 8 mm may be used in pockets of D = 10 mm.

■

Multiple assignments of pockets are only allowed with 2 or 3 cylind rical probes of

Ø 6 mm and pockets of 15 x 0.75 mm.

■

If two probes are assigned, the spring clip provided on delivery must be installed in

the pocket.

■

With pockets U, US, E, ES, and EZS made from St 35.8I/16Mo 3 materials, the

permitted operating period at operating temperatures above 420 °C is limited to
200,000 hours. Compliance with TRD 508 is essential for applications in this range.

Mounting the thermostat head

Any installation position

Mount the thermostat head

On the chassis with 2 M3 screws

( 1 ) screw
( 2 ) panel

( 1 )

( 2 )

4. Dimensions

Panel cut-out

Dimensions

ETHf-20

ETHf-70

Fitted thermostat

Type s erie s ETH

ETH-20

ETH-70

Approved probes and pockets

A U UO US ES

Plain cylindrical probe Screw-in pocket with screw-in

spigot Form A to DIN 3852/2.
With fixing screw

Pocket as screw-in pocket, with
screw-in spigot Form "A" to
DIN 3852/2, with fixing screw

Weld-in pocket
with fixing screw and clamp

For code "f" pocket as weld-in pocket, with
welding shoulder; pocket secured with union nut,
connection "C".

EBCDQV

( A ) = washer / ( B ) = seal

For code "f" pocket as screw-in
pocket, with screw-in spigot
Form A to DIN 3852/2; pocket
secured with union nut, probe
mounting "C"

Probe mounting "C"
with loose coupling, threaded at
both ends

Plain cylindrical probe with
shoulder and union nut. Shoulder
brazed or welded to capillary

Plain cylindrical probe, threaded
connector brazed or welded to
capillary

For code "f" double threaded
coupling for subsequent capillary
mounting. Probe temperature
max. +200 °C

For code "f" clamping gland for
subsequent capillary mounting.
Probe temperature max. +200 °C

SW

ØD

G

L1

S

Permissible loading on the pocket
U, US, UZ, UZS, E, ES, and EZS pockets

Steel pocket

Materials:

Tub e: St 3 5. 8 I
Screw-in nipple up to 300

°

C: 9 SMnPb.28 K

Screw-in nipple up to 450

°

C: 16 Mo 3 (turned groove)

Weld-in nipple: 16 Mo 3 (without turned groove)

Loading

Permissible incident flow velocity

A

The values below refer to the maximum loading on the probe mounting
concerned. The actual maximum sealable pressure depends on the mounting
conditions and may possibly be lower.

Temperature Tube diameter "D"

8 x 0.75 mm

or conical

10 x 0.75 mm 15 x 0.75 mm

maximum permissible pressure
100 °C 89 bar 72 bar 48 bar
150 °C 83 bar 67 bar 45 bar
200 °C 78 bar 63 bar 42 bar
300 °C 59 bar 47 bar 32 bar
350 °C 50 bar 40 bar 27 bar
400 °C 46 bar 37 bar 25 bar
450 °C 24 bar 19 bar 13 bar

Temperature: +200

°

C
Heat carrier: air ( 1 ), water, oil ( 2 )
Tube diameter "D". 08mm

10 mm

. . . . . . . . . . . . . .

15 mm

Permissible incident flow
velocity (m/sec)
at maximum permitted
pressure loading and
different immersion
tube lengths ( S ).

( 1 ) air
( 2 ) water, oil
( S ) immersion tube length

Pocket

A

The values below refer to the maximum loading on the probe mounting
concerned. The actual maximum sealable pressure depends on the mounting
conditions and may possibly be lower.

Immersion tube length
200 mm:

Material: steel

Temperature: +200 °C
Heat carrier: air ( 1 ), water, oil ( 2 )
Tube diameter "D". 08mm

10 mm

. . . . . . . . . . . . . .

15 mm

Permissible incident flow
velocity (m/sec)
at maximum permitted
pressure loading and
different immersion
tube temperatures ( t ).

( 1 ) air
( 2 ) water, oil
( t ) temperature

Stainless steel

Tube and nipple: X 6 CrNiMoTl 17 122

Temperature Tube diameter "D"

8x0.75mm

or conical

10 x 0.75 mm 15 x 0.75 mm

maximum permissible pressure

100

°

C92bar74bar50bar

150

°

C88bar71bar48bar

200

°

C83bar67bar45bar

300

°

C72bar58bar39bar

400

°

C67bar54bar36bar

Brass

Tube and nipple: CuZn

Temperature Tube diameter "D"

8 x 0.75 mm 10 x 0.75 mm 15 x 0.75 mm

maximum permissible pressure

100

°

C50bar40bar27bar

150

°

C48bar39bar26bar

Probe mountings B, C, D

(probe in di rect contact with med ium)

Process connections

A, H, UO, Q and V

must only be used in unpressurized media.

Mounting the probe

Nipple material

CuZn 39 9 SMnPb.28K X 6 CrNiMoTi 17 122

Max. temperature

200 °C 300 °C 400 °C

Probe material Ø mm Device function

TW STB, STW (STB)

Cu-DHP 04 06bar 2bar

05 05bar
06 04bar
07 03bar
08 03bar
09 03bar

10 03bar

1.4571 (V4A); St 35 04 - 10 10 bar 2 bar

H

The temperature probe ( 2 ) must be fully immersed in the medium,
otherwise there will be appreciable variations in the switching point.

(1) Clamp
( 2 ) Temperature probe
(3) Capillary
(4) Pocket
(5) Spring clip

In the "U" and "US" probe mountings
of thermostats with capillary, the
temperature probe is held in position
by sliding a clamping clip over the
capillary and clamping it with a screw
in the enlarged open end of the
pocket.
With "B, C, D, E, ES, Q and V" probe
mountings, the probe is held in
position by the fitting attached to the
capillary at the factory.

(1)

( 2 )

(1)

(3)

( 2 )

(4)

(5)

5. Installation

Regulations and notes

V

■

The electrical connection must only be carried out by qualified personnel.

■

The choice of cable, the installation and the electrical connection must

conform to the requirements of VDE 0100 “Regulations on the Installation of
Power Circuits with Nominal Voltages below 1000 V” and the appropriate
local regulations.

■

If contact with live parts is possible when working on the device, it must be

completely disconnected from the electrical supply.

■

Ground the instrument to the protective earth at the PE terminal. The cross-

section of this cable must be at least the same as that of the supply cables.
Wire the grounding conductors in a star configuration to a common earth
point that is connected to the PE conductor of the electrical supply. Do not
loop the grounding cables, that is, do not run them from one instrument to
another.

■

Apart from faulty installation, incorrect settings on the thermostat may also

adversely affect the proper functioning of the subsequent process or cause
other damage. It should only be poss ible for qualified personnel to make
these settings. Please observe the relevant safety regulations for such
matters.

7. Self-monitoring

Response to a fracture of the measuring system

Response to low temperature

Using the STW (STB) as an STB

H

With the STB and STW (STB), a fracture of the measuring system
(leaking) causes the circuit to stay open permanently.
With the STB, the microswitch is also reset.

H

With the STW (STB) and STB, if the probe temperature falls below
the minimum value of

-20 °C, the circuit opens.
Once the probe temperature has reached the minimum value, the
STB must be reset manually.
With the STW, reset is automatic.

V

The required lockout function must be ensured by the downstream
circuit. This circuit must comply with VDE 0116.

8. Technical data

Mode of operation

per DINEN60730-1, DINEN60730-2-9, and DINEN14597
STW(STB) 2 BKLNP
STB 2 BFHKLNPV

Permissible ambient temperature in operation

Permissible probe temperature: max. end of scale +15%

Permissible storage temperature: max. 50 °C, min. -50 °C

Switching point accuracy

as % of scale range,
relative to limit value at TU+22 °C

STB, STW (STB) in top third of scale

at start of scale

Mean ambient temperature effect

as % of scale range, relative to limit value.
If the ambient temperature at the thermostat head housing and/or capillary
deviates from the calibration ambient temperature value of +22 °C in, the
switching point is shifted.
Higher ambient temperature = lower switching point
Lower ambient temperature = higher switching point

Capillary

Thermostat head

At end of scale

max. +80

°

C+80

°

C

min. -40

°

C +80 °C< 200

°

C

-20

°

C +80 °C ≥ 200 °C ≤ 350 °C

-40

°

C +80 °C > 350 °C ≤ 500 °C

Fitted thermostats with end of scale

< +200

°

C ≥ +200 °C ≤ +350 °C

STB/STW (STB) STB/STW (STB)

effect on thermostat head

0.17% per °C 0.13%/K
effect on capillary per meter

0.054 %/K 0.11 %/K

+0

-5

%

+0

-10

%

Maximum permissible contact rating

(additional info to details on nameplate)
AC 230 V +10%, 10(2) A, cos ϕ = 1(0.6)
DC 230 V +10%, 0.25 A
or
AC 230 V +10%, 6(1.2) A, cos ϕ = 1(0.6)
for gold-plated microswitch, extra code /au
AC/DC 24 V, 0.1 A

Contact reliability

To ensure maximum switching reliability, we recommend a minimum loading
of:
24 V AC/DC, 20 mA for silver contacts (standard)
10 V AC/DC, 10 mA for gold-plated contacts (code /au)

Rated surge voltage

2500 V (over the switching contacts: 400 V)

Overvoltage category II

For required fusing, see maximum switching current

Operating medium

water, oil, air, superheated steam

Time constant t

0.632

Protection

EN 60 529 - IP 00

Fitted thermostats with end of scale

≥ +350

°

C ≤ +500 °C

STB/STW (STB)

effect on thermostat head

0.12%/K

effect on capillary per meter

0.03 %/K

in water in oil in air / superheated

steam

≤ 45 s ≤ 60 s ≤ 120 s

Electrical connection

■ The instrument complies with Protection Class I.

Cu capillary tube with PE function

Connection diagrams

H

1.

Make the connection
to the terminals ( 2 ) as
shown in the relevant
connection diagram.

2.

Connect the
protective ground
conductor to terminal
"PE" ( 1 ).

3.

The reset button ( 3 )
must be free to move.

( 1 ) Protective ground

conductor "PE"
( 2 ) Connection screw
( 3 ) Reset button

H

■

The connection is suitable for fixed wiring.

Cable entry is without fixed strain relief.
Attachment type "X" (no special tools).

■

Screw terminal for conductor cross-section up to 2.5 mm2.

V

With CrNi capillary tubes "longer than 1000 mm", it is the user's responsibility
to provide the requisite protective measures against electric shock.

ETH-20

with changeover contact

ETH-70

with break contact and
restart lockout

ETH-70/U

with normally-closed
contact, restart lockout,
and additional signal
contact

( 1 )

( 2 )

ETH-20

( 1 )

( 2 )

( 3 )

ETH-70

6. Setpoint/limit setting

■ Use a screwdriver to set the switching point on the setpoint adjuster
before installation.

Resetting the STB

Once the temperature has fallen below the set limit (safe temperature limit)
by about 10% of the scale range, the microswitch can be reset.

■ Press the reset button ( 1 ).

1.

Press and hold the reset button ( 1 ) until the microswitch is reset

(1) setpoint pointer
(2) upper stop
( 3 ) scale graduation
( 4 ) setpoint adjuster

( 1 ) Reset button

(1)

(2)
(3)
(4)

(1)