KM-70
Panel-mounting Thermostat
B 60.2045.0
Operating Instructions
2008-10-24/00073778
Please read these Operating Instructions before commissioning the instrument.
Keep the manual in a place that is accessible to all users at all times. Please
assist us to improve these operating instructions, where necessary. Your comments will be appreciated.
Phone +49 661 6003-0
Fax +49 661 6003-607
All neccessary settings and, where appropriate, alterations inside the instrument
are described in these operating instructions. However, if any difficulties should
still arise during commissioning, you are asked not to carry out any unauthorized manipulations on the unit. You could endanger your rights under the
instrument warranty! Please contact the nearest subsidiary or the head office in
such a case.
Contents
Page
1 Introduction ............................................................................... 5
1.1 Typographical conventions ...................................................................... 5
1.1.1 Warning signs .............................................................................................. 5
1.1.2 Note signs ................................................................................................... 5
1.2 Application ................................................................................................. 6
1.3 Marking ...................................................................................................... 6
1.4 Safety notes ............................................................................................... 6
2 Instrument identification .......................................................... 7
2.1 Nameplate .................................................................................................. 7
2.2 Type designation ....................................................................................... 7
3 Mounting .................................................................................... 8
3.1 Dimensions ................................................................................................ 8
3.2 Fixing the panel-mounting thermostat .................................................... 9
3.2.1 Mounting the switch head ........................................................................... 9
3.3 Capillary / temperature probe / pocket ................................................... 9
3.3.1 General ........................................................................................................ 9
3.3.2 Approved probes and pockets ................................................................. 10
3.4 Permissible loading on the pocket ........................................................ 13
3.4.1 Pockets U, US, E and ES .......................................................................... 13
4 Installation ............................................................................... 17
4.1 Regulations and notes ............................................................................ 17
4.1.1 Electrical connection ................................................................................. 17
5 Settings .................................................................................... 19
5.1 Limit setting ............................................................................................. 19
5.2 Resetting the protection temperature limiter (STB) ............................. 19
5.3 Limit locking ............................................................................................ 20
5.4 Self-monitoring ........................................................................................ 20
5.4.1 Response to a measurement system fracture .......................................... 20
5.4.2 Response to low temperature ................................................................... 20
6 Instrument description ........................................................... 21
6.1 Technical data ......................................................................................... 21
5
1 Introduction
1.1 Typographical conventions
1.1.1 Warning signs
1.1.2 Note signs
abc
1
Footnote
Footnotes are remarks that refer to specific points in the text. Footnotes
consist of two parts:
A marker in the text and the footnote text.
The markers in the text are arranged as continuous superscript numbers.
The footnote text (in smaller typeface) is placed at the bottom of the page and
starts with a superscript number.
✱ Action
This symbol indicates that an action to be performed is described.
The individual steps are marked by this asterisk, e. g.
✱ Select setpoint
V
Danger
This symbol is used when there may be danger to personnel if the
instructions are ignored or not followed correctly.
A
Caution
This symbol is used when there may be damage to equipment if the
instructions are ignored or not followed correctly.
H
Note
This symbol is used when your special attention is drawn to a remark.
v
Reference
This symbol refers to further information in other chapters or sections.
1 Introduction
6
1.2 Application
Panel-mounting thermostats in the KM series are suitable for monitoring heat
generators, boilers, heat exchangers and pumps in HVAC engineering.
1.3 Marking
1.4 Safety notes
Physical and toxicological properties of the substances that may leak in the
event of a system fracture:
1
At present there is no restrictive statement from the health authorities
concerning any danger to health over short periods and at low
concentration, e.g. after a fracture of the measuring system.
A
Cutting through or kinking the capillary of the KM series panel-mounting thermostat will lead to permanent instrument failure!
H
Version to DIN 3440:
STB = protection temperature limiter
Panel-mounting thermostats in the KM series comply with VDE 0631.
Type examination to:
H
- DIN 3440
- Pressure Equipment Directive 97/23/EC
- DVGW Gas Appliances Directive 90/396/EEC
H
Filling liquid may escape in the event of a system fracture.
Control range
with
end of scale
°C
Danger-
ous
reactions
Fire/explosion
hazard
Water
contami-
nation
Toxicological data
Ignition
temp.
°C
Explosion
limit
% v/v
irritant danger to
health
toxic
≥ +200°C < +200 no +355 0.6 — 0.8 yes yes
1
no
≥ +200°C ≤ +350 no +490 - - yes yes
1
no
7
2 Instrument identification
2.1 Nameplate
( 1 ) Type / permissible ambient temperature
( 2 ) Type code
( 3 ) Limit / Ambient temperature
at which this thermostat was calibrated (option) / protection rating
( 4 ) Contact rating
( 5 ) Approval mark
( 6 ) Sales number
( 7 ) Production number
( 8 ) Week of production
( 9 ) Year of production
2.2 Type designation
Type
designation
( 1 )
( 2 )
( 3 )
( 4 )
( 5 )
( 6 )
(7)
(8)
( 9 )
KM-70/ . Panel-mounting thermostat with microswitch,
with capillary, standard mounting A (plain cylindrical probe),
protection temperature limiter (STB),
with lock-out
/O (n.c.) break contact
/U changeover contact
8
3 Mounting
3.1 Dimensions
KM-70
( 1 ) Start of scale
( 2 ) End of scale
( 3 ) Faston connectors, A 6.3 x 0.6, DIN 46244
( 4 ) Panel
( 5 ) Reset knob
(4)
(5)
(1)
(3)
(2)
9
3 Mounting
3.2 Fixing the panel-mounting thermostat
Operating
position
unrestricted
3.2.1 Mounting the switch head
by two M4 screws
on the chassis
(1) Screw
(2) Panel
3.3 Capillary / temperature probe / pocket
3.3.1 General
(1)
(2)
A
Cutting through or kinking the capillary of the panel-mounting thermostat will
lead to permanent instrument failure!
The minimum permissible bending radius of the capillary is 5 mm.
The temperature probe must be installed in a JUMO pocket, otherwise the
approval of the panel-mounting thermostat becomes invalid.
H
The temperature probe must be completely immersed in the medium to be
measured.
Temperature probes and pockets must not come into contact with the walls of
the container or pipe.
To ensure their overall accuracy, the thermostats must only be used together
with the pockets supplied by the factory.
Pockets with diameter D = 10 mm may only be fitted with probes with
diameter d = 8 mm.
For operation in air, probe mounting A (without pocket) must be chosen.
3 Mounting
10
3.3.2 Approved probes and pockets
Forms
A and H
Forms
D, B and C
AH
Plain cylindrical probe Coiled probe
L
_15
Ød
d
D
~
10
L1
10
L
DBC
Plain cylindrical probe,
threaded connector
brazed or welded to
capillary
Probe mounting C with
loose nipple, threaded
at both ends
Plain cylindrical probe,
with shoulder and union
nut, shoulder brazed or
welded to capillary
SW
L
d
~
15
G
L1
S
hex
SW
L
d
~
15
G
L1
S
hex
SW
L
d
~
15
L1
S
hex
11
3 Mounting
Forms
U and US
Forms
UH and UO
UUS
Screw-in pocket with
screw-in spigot Form A
to DIN 3852/2, with
fixing screw
Weld-in pocket with fixing screw and clip
SW
S
G ½
14
Ø D
hex
27
S
Ø
D
Ø
25
Ø
8
Ø
12
Ø
30
UH UO
Screw-in pocket with
fixing screw, for hemp
sealing (no sealing
shoulder) for
temperatures up to
110°C
Screw-in pocket open
at end, with fixing screw
SW
D
G
L1
S
hex
SW
d
S
L1
G
D
hex
3 Mounting
12
Forms
E and ES
Forms
Q and V
EES
Screw-in pocket, with screw-in
spigot Form A to DIN 3852/2,
pocket secured with union nut,
probe mounting C
Weld-in pocket with welding shoulder,
pocket secured with union nut, probe
mounting C
SW
D
L1
S
G
hex
SW
D2
8
Ø
12
Ø
D
S
hex
QV
Double thread for
retrofitting on capillary.
Max. probe
temperature +200°C.
Oil-resistant seal.
Sealing gland for
retrofitting on capillary.
Max. probe
temperature +200°C.
Oil-resistant seal.
Scheibe
Scheibe
Dichtung
SW
d
G
L1
Washer
Seal
Washer
hex
Scheibe
Scheibe
Dichtung
SW
Dichtung
d
G
L1
Washer
Seal
Washer
Seal
hex
13
3 Mounting
3.4 Permissible loading on the pocket
3.4.1 Pockets U, US, E and ES
3.4.1.1 Steel pockets U, US, E and ES
Materials Tube: St 35.8 I
Screw-in nipple up to 300°C: 9 SMnPb28 K
Screw-in nipple up to 450°C: 16 Mo 3 (turned groove)
Weld-in nipple: 16 Mo 3 (no turned groove)
Loading
A
The values given below refer to the maximum loading on the probe mounting
concerned. The maximum pressure that can be sealed depends on the
installation conditions and may possibly be lower.
Te mp er at ure
Tube diameter D
8 x 0.75 mm
or conical
10 x 0.75 mm 15 x 0.75 mm
Max. permissible pressure
100°C 89 bar 72 bar 48
150°C 83 bar 67 bar 45
200°C 78 bar 63 bar 42
300°C 59 bar 47 bar 32
350°C 50 bar 40 bar 27
3 Mounting
14
Permissible
incident flow
velocity
Permissible incident flow velocity “v” at the maximum permissible pressure
loading and different immersion tube lengths S.
Permissible incident flow velocity “v” at the maximum permissible pressure
loading and different immersion tube temperatures “t”.
Temperature: +200°C
Thermal medium:
air
water, oil
Tube diameter D:
08mm
10 mm
. . . . . . . . . . . . . .
15 mm
Immersion tube length (mm)
Air
Water, oil
Material: ST35.8 I
Immersion tube length “s”:
200 mm
Thermal medium:
air
water, oil
Tube diameter D:
08mm
10 mm
. . . . . . . . . . . . . .
15 mm
Air
Air
Air
Water, oil
Temperature °C
15
3 Mounting
3.4.1.2 Stainless steel pockets U, US, E and ES
Loading
3.4.1.3 Brass pockets U and E
Loading
3.4.1.4 Brass pocket UH
Loading
3.4.1.5 Probe mountings B, C and D
(probe in direct contact with medium)
Material of tube and nipple: X 6 CrNiMoTl 17 122
Te mp er at ure
Tube diameter D
8 x 0.75 mm
or conical
10 x 0.75 mm 15 x 0.75 mm
Max. permissible pressure
100°C 92 bar 74 bar 50 bar
150°C 88 bar 71 bar 48 bar
200°C 83 bar 67 bar 45 bar
300°C 72 bar 58 bar 39 bar
Material of tube and nipple: CuZn
Te mp er at ure
Tube diameter D
8 x 0.75 mm 10 x 0.75 mm 15 x 0.75 mm
Max. permissible pressure
100°C 50 bar 40 bar 27 bar
150°C 48 bar 39 bar 26 bar
Material of tube and nipple: CuZn
Temperature Max. permissible pressure
110°C 16 bar
Nipple material CuZn 39 9 SMnPb.28 K X 6 CrNiMoTl 17 122
Temperature °C 200 300 400
Probe material
dia. mm
Thermostat action: STB
SF-Cu
4—10 2bar
ST 35; 1.4571(V4A)
3 Mounting
16
In the case of probe mountings U, US, UH and UO, the temperature probe is
secured in the pocket with a clip (1).
A
Forms A, H, UO, Q, V may only be used in pressure-free media.
A
- To ensure their overall accuracy, the thermostats must only be used in con-
junction with the pockets supplied by the factory.
- Fitting several probes into a common pocket is only permitted with 2 or 3
cylindrical probes 6 mm dia. and pockets
15 x 0.75 mm.
- When fitting 2 probes into a pocket, the factory-supplied spring clip must
be fitted in the pocket.
- When used in air, the temperature probe must be used without a pocket.
H
The temperature probe (2) must be immersed in the medium for its entire
length, otherwise there will be appreciable deviations from the switching point.
(1)
(2)
17
4 Installation
4.1 Regulations and notes
4.1.1 Electrical connection
■ Terminals and connections suitable for internal conductors
■ Connection suitable for fixed wiring
■ Cable entry without strain relief
■ Protection Class I, covering:
- switch head including 4000 mm Cu capillary (including probe length)
- switch head only with CrNi capillary and probe
as standard
V
■ The electrical connection must only be carried out by qualified personnel.
■ The choice of cable, the installation and the electrical connection must con-
form to the requirements of VDE 0100 “Regulations on the Installation of
Power Circuits with Nominal Voltages below 1000 V” or the corresponding
local requirements.
■ If contact with live parts is possible while working on the instrument, it must
be completely disconnected from the electrical supply.
■ Earth the instrument at the PE terminal to the protective earth conductor.
This cable must have at least the same cross-section as used for the supply
cables. Earthing cables must be wired in a star configuration to a common
earth point that is connected to the protective earth conductor of the electrical supply. Do not loop earthing cables, i.e. do not run them from one
instrument to another.
■ Apart from faulty installation, incorrect settings on the thermostat can also
affect the proper functioning of the subsequent process or lead to damage.
Setting up must therefore be restricted to qualified personnel.
Please observe the relevant safety regulations for such matters.
In the case of probes, capillary types and capillary lengths that are not covered
by Protection Class I, the user must take care that the required protection
against electric shock is assured.
0
100
( 1 )
( 1 )
( 1 ) Faston connector
( 1 ) (A 6.3 x 0.8 mm, DIN 46 244)
4 Installation
18
Code X
Screw terminals up to 2.5 mm
2
conductor cross-section
( 1 ) Clamping block
( 2 ) Connection screw
Connection
diagrams
( 1 )
( 2 )
Type KM - 7 0
with (n.c.) break
contact and lock-out
Type KM- 7 0
with (n.c.) break
contact, lock-out
and additional signal
contact
19
5 Settings
5.1 Limit setting
✱ Adjust the switching point on the limit arm with a screwdriver before fitting
the thermostat in position.
( 1 ) Scale division
( 2 ) Limit pointer
( 3 ) Top stop
( 4 ) Limit arm
5.2 Resetting the protection temperature limiter (STB)
After the temperature has dropped by about 10% of the scale span below the
set limit (critical temperature), the microswitch can be reset.
✱ Press the reset button ( 1 ), until the microswitch is reset.
100
0
( 1 )
( 3 )
( 2 )
( 4 )
On limit ranges above 120°C, the limit that was set must be locked to prevent
re-adjustment.
➩ Chapter 5.3 “Limit locking”, page 20.
( 1 )
5 Settings
20
5.3 Limit locking
( 1 ) Cover
( 2 ) Lead-sealable screw
5.4 Self-monitoring
5.4.1 Response to a measurement system fracture
5.4.2 Response to low temperature
( 2 )
( 1 )
H
A fracture of the measurement system (leakage), will cause the circuit on the
STB to open permanently and, in addition, the microswitch is locked out.
H
When the temperature falls below the minimum probe temperature -10°C (on
the STB), the circuit opens automatically.
When the temperature goes above the minimum probe temperature, the STB
must be reset manually.
➩ Chapter 5.2 “Resetting the protection temperature limiter (STB)”, page 19.
21
6 Instrument description
6.1 Technical data
Permissible
ambient
temperature
Permissible
probe
temperature
max. end of scale +15%,
min. -50°C
Permissible
storage
temperature
max. +50°C, min. -50°C
Housing galvanized steel sheet
cover: heat-resistant plastic
Connecting
cable
conductor cross-section up to 2.5 mm
2
Contact rating
Contact
reliability
To ensure the maximum switching reliability, we recommend a minimum loading of:
- 100 mA, 24 V AC/DC, with silver contacts (standard)
- 10 mA, 10 V AC/DC, with gold-plated contacts (code “au”)
Rated surge
voltage
2500 V (400 V via the switching contacts) overvoltage category II
Required
fusing
see Contact rating
Protection EN 60 529 - IP00, pollution degree 3
Capillary Switch head with end of scale
max. +80°C +80°C
min. -20°C +18°C
< 200°C
≥ 200°C ≤ 350°C
Ty pe C on ta ct
type
Code Current ( A ) Voltage
KM-70
U
contact
opening on
temperature rise
16 (2)
16 (2)
0.25
400 V AC
230 V AC p.f. = 1 (0.6)
230 V DC
contact closing
on falling
temperature
2 (2)
2 (2)
0.25
400 V AC
230 V AC
230 V DC
O
contact
opening on
temperature rise
16 (2)
16 (2)
0.25
400 V AC
230 V AC p.f. = 1 (0.6)
230 V DC
6 Instrument description
22
Operating
medium
water, oil, air, superheated steam
Time constant
t
0.632
Mode of
operation
to EN 60 730-1 and EN 60 730-2-9
STB: 2BFHKLP
Explanation of codes:
2 mode of operation type 2
B automatic mode of operation with microswitch disconnection
F can only be reset with tools
H free-release mechanism,
contacts cannot be prevented from opening
K with probe break protection
L no auxiliary power required
P mode of operation type 2, verified through declared temperature cycling
Nominal
position
unrestricted
Weight approx. 0. 3 kg
Capillary/
probe material
Minimum
bending radius
of capillary
5mm
Switching point
accuracy
(in % of scale span;
referred to the set limit at T
A
+22°C)
STB in upper third of scale
at scale start
in water in oil in air / superheated steam
≤ 45 sec ≤ 60 sec ≤ 120 sec
End of scale Capillary Probe
up to +200°C copper, Mat. Ref. 2.0090
1.5 mm dia.
copper, Mat. Ref. 2.0090
brazed
up to +350°C copper, Mat. Ref. 2.0090
1.5 mm dia.
st. steel, Mat. Ref. 1.4571
brazed
at extra cost
up to +350°C st. steel, Mat. Ref. 1.4571
1.5 mm dia.
st. steel, Mat. Ref. 1.4571
welded
+0
-5
%
+0
-10
%
23
6 Instrument description
Mean ambient
temperature
effect
(in % of scale span) referred to limit.
A deviation of the ambient temperature at the switch head and/or capillary
from the +22°C calibration ambient temperature will produce a switching point
shift:
higher ambient temperature = lower switching point
lower ambient temperature = higher switching point
For temperatures with end of scale:
< +200°C ≥ +200°C ≤ +350°C
on switch head, % per °C
0.17% 0.13%
on capillary, % per °C per m length
0.054 0.11
JUMO GmbH & Co. KG
Street address:
Moritz-Juchheim-Straße 1
36039 Fulda, Germany
Delivery address:
Mackenrodtstraße 14
36039 Fulda, Germany
Postal address:
36035 Fulda, Germany
Phone: +49 661 6003-0
Fax: +49 661 6003-607
e-mail: mail@jumo.net
Internet: www.jumo.net
JUMO Instrument Co. Ltd.
JUMO House
Temple Bank, Riverway
Harlow, Essex CM20 2TT, UK
Phone: +44 1279 635533
Fax: +44 1279 635262
e-mail: sales@jumo.co.uk
Internet: www.jumo.co.uk
JUMO Process Control, Inc.
8 Technology Boulevard
Canastota, NY 13032, USA
Phone: 315-697-JUMO
1-800-554-JUMO
Fax: 315-697-5867
e-mail:
info@jumo.us
Internet: www.jumo.us
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