Kromschroeder DG B Series Manual


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Pressure switch for gasDG
Technical Information · GB
4 Edition 08.13
• Monitoring of gas and air pressures (positive, negative and differential
pressures)
• EC type-tested and certified pursuant to EN 1854 and class “S”
• DG..T: FM approved and UL listed
• Certified pursuant to GOST-R and AGA
• Certified for systems up to SIL 3 and PL e
• Pressure switch with internal lock and manual reset
• Suitable for biologically produced methane (can be used on pipes with
Zone 2 explosive atmospheres without isolating amplifier)
• With approved isolating amplifier for Zone 1 and 2 hazardous areas
• RoHS 2002/95/EC
• DG..S: special version available for NH
3
and O
2
AGA

DG ·Edition 08.13
▼
= To be continued
2

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Contents
Pressure switch for gas DG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 2
1 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.1 Examples of application......................................................5
1.1.1 Gas deficiency monitoring...............................................5
1.1.2 Differential pressure monitoring ....................................5
1.1.3 Systems leak tightness check...........................................5
1.1.4 Negative pressure monitoring.........................................5
1.1.5 Air line with minimum pressure and flow monitoring ....6
1.1.6 Low-pressure cut-off and high gas pressure protection
device......................................................................................6
2 Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..7
2.1 Overview......................................................................8
3 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Positive pressure measurement........................................9
3.2 Negative pressure measurement .....................................9
3.3 Differential pressure measurement..................................9
3.4 Connection diagram........................................................10
3.4.1 Blue pilot lamp for 230 V AC or for 120 V AC ...............10
3.4.2 Pilot lamp with plug......................................................10
3.4.3 Red/green pilot LED for 24 V DC/AC or for 230 V AC ....10
3.4.4 Pilot LED with plug ........................................................10
3.5 Wiring...............................................................................11
3.6 DG in Zone 1 (21) and 2 (22) hazardous areas .................12
3.7 DG on pipes with Zone 2 (22) explosive atmospheres.... 13
3.8 Animation ........................................................................14
4 Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.1 Selection table ..................................................................15
4.2 Type code .........................................................................16
5 Project planning information . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1 Installation ........................................................................17
6 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
6.1 Fastening set with screws, U-shape bracket.....................19
6.2 Connecting set ..................................................................19
6.3 External adjustment ............................................19
6.4 Pressure equalization element ............................19
6.5 Restrictor orifice...................................................20
6.6 Test key PIA ..........................................................20
6.7 Filter pad set ........................................................20
6.8 Tube set................................................................20
6.9 Standard socket set .............................................20
6.10 Standard coupler plug .......................................20
6.11 Pilot lamp set, red or blue .................................21
6.12 LED set, red/green.............................................21
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.1 Adjusting range, switching hysteresis ....................23
7.2 Safety-specific characteristic values for DG............24
7.2.1 Determining the PFHD value, the λD value and the
MTTFd value.........................................................25
7.2.2 Calculating the PFHD ...........................................25
7.3 Dimensions .............................................................26
8 Maintenance cycles . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
9.1 Diagnostic coverage DC ...........................................27
9.2 Mode of operation ..................................................27
9.3 Category ..................................................................27
9.4 Common cause failure CCF .....................................27
9.5 Fraction of undetected common cause failures β ...27
9.6 B10d value................................................................27
9.7 T10d value................................................................27
9.8 Hardware fault tolerance HFT .................................27
9.9 Mean dangerous failure rate λD ..............................28
9.10 Safe failure fraction SFF..........................................28
9.11 Probability of dangerous failure PFHD ..................28
9.12 Mean time to dangerous failure MTTFd ..............28

DG ·Edition 08.13
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Application
DG..U-3 DG..H, DG..N DG..-6 DG..T
Adjustable switching point DG..H: switches and locks off
with rising pressure. DG..N: switches and
locks off with fall- ing pressure. Manual
reset.
The gas pressure switch DG monitors extremely low pressure differentials and
triggers switch-on, switch-off or switch-over operations if a set switching
point is reached. The switching point is adjustable via a hand wheel.
It monitors positive and negative gas pressures on various industrial gas
and air appliances, such as boiler fan monitor- ing and differential pressure
monitoring in firing, ventilation and air-conditioning systems.
The TÜ V-tested special-design pressure switch is used as defined by VdTÜ V
Code of Practice “Druck 100/1” (Pressure 100/1) in firing installations for steam
and hot-water generators in accordance with TRD 604, Para. 3.6.4, as well as
class “S” for DG..B, DG..U and DG..I pursuant to EN 1854.
With fitted socket pursuant to DIN
EN 175301-803
Hand wheel with "WC and mbar
scale. NPT conduit for electrical
connection.
Type
Positive
pressure
Negative
pressure
Differential
pressure
DG..B
Gas, air, flue gas
or biomethane
–
–
DG..U, DG..T
Gas, air, flue gas
or biomethane
Air or flue gas
Air or
flue gas
DG..H, DG..N,
DG..HT, DG..NT
Gas, air, flue gas
or biomethane
Air or flue gas
Air or
flue gas
DG..I
Air or flue gas
Gas, air, flue gas
or biomethane
Air or
flue gas
DG..S
NH
3
or O
2
–
–

DG ·Edition 08.13
5

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Application
1 .1 Examples of application
1 .1 .1 Gas deficiency monitoring
For monitoring the minimum gas inlet pressure
1 . 1 . 2 Differential pressure monitoring
Differential pressure switch for monitoring air filters
1 . 1 . 3 Systems leak tightness check
Electronic safety shut-off valve SAV with closed position check
of downstream devices.
1 . 1 . 4 Negative pressure monitoring
Monitoring the negative pressure ensures the correct posi-
tioning of the components during fully automatic assembly
of gas meters.

DG ·Edition 08.13
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Application > Examples of application
1 . 1 . 5 Air line with minimum pressure and flow monitoring
1 . 1 . 6 Low-pressure cut-off and high gas pressure protection
device
The air flow generated by the fan may be monitored as follows:
The static pressure is monitored by pressure switch DG (PZL), as
long as it can be demonstrated that the display consequently
shows an adequate and secured flow of air, or
The pressure switch DG (PDS) controls the flow of air via the
differential pressure on the orifice.
If there is no air pressure supplied or if there is no differential
pressure on the orifice, the system will be blocked.
If the pressure is either too low or too high, the min./max. pres-
sure switch DG (PZL/PZH) switches in order to avoid start-up
or to initiate a safety shut-down.
PI
PDS
DG
KFM/RFM
DG
PZL
1/min
PI
PI
VAS..N VAS..L
AKT GFK KFM GDJ KFM
PZL PZH
DG
Min./Max.

DG ·Edition 08.13
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AGA
1 Certification
SIL and PL certified*
Approval for Russia*
For systems up to SIL 3 pursuant to EN 61508 and PL e pur- suant
to ISO 13849
EC type-tested and certified*
Certified by Gosstandart pursuant to GOST-R. Approved by
Rostekhnadzor (RTN).
Scan of the approval for Russia (RUS) –see www.docuthek. com ➔
Elster Kromschröder ➔Kromschröder, LBE ➔Products
➔04 Pressure switches ➔Pressure switches for gas DG ➔
Kind of document: Certificate ➔DG B12185 (nationales Zerti- fikat
Russland) (RUS)
DG . .T: FM approval*
pursuant to
–Gas Appliances Directive (2009/142/EC) in conjunction with
EN 1854, Class “S”
Meets the requirements of the
–Low Voltage Directive (2006/95/EC)
–Declaration of conformity (D, GB) –see www.docuthek. com ➔
Elster Kromschröder ➔Kromschröder, LBE ➔Products ➔04
Pressure switches ➔Pressure switches for gas DG ➔Kind of
document: Certificate ➔DG (K OS Kon- formitätserklärung)
– AGA approval*
Australian Gas Association, Approval No.: 5484
http://www.aga.asn.au/product_directory
Factory Mutual Research Class: 3510 Flow and pressure safety
switches.
Designed for applications pursuant to NFPA 85 and NFPA 86.
www.approvalguide.com
DG . .T: UL approval*
UL 353 Limit control.
Underwriters Laboratories –www.ul.com ➔Certification.
* Approval does not apply to DG..S. DG..S complies with the re- quirements of
the Low Voltage Directive (2006/95/EC).

DG ·Edition 08.13
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Certification
2 .1 Overview

DG ·Edition 08.13
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2 Function
The pressure switch DG switches in the event of increasing or
decreasing pressure. Once the set switching point is reached,
a micro switch is activated in the DG which is designed as a
change-over contact.
3 .1 Positive pressure measurement
Positive pressure measurement is designed, for example, for
checking the fan function or measuring the min./max. gas
pressure.
The positive pressure is measured in the lower diaphragm
chamber, port 1 or 2.
The upper diaphragm chamber is ventilated via port 3 or 4.
3 . 2 Negative pressure measurement
Negative pressure measurement (air, flue gas) is designed, for
example, for monitoring a suction pressure blower. The nega-
tive pressure is measured in the upper diaphragm chamber,
port 3 or 4, and on DG..T via port 4. The lower diaphragm
chamber is ventilated via port 1 or 2.
In the case of DG..I, the negative pressure (gas, air, flue gas
or biologically produced methane) is measured in the lower
diaphragm chamber, port 1 or 2. The upper diaphragm cham-
ber is ventilated via port 3 or 4.
3 . 3 Differential pressure measurement
Differential pressure measurement is designed for instance for
safeguarding an air flow rate or for monitoring filters and fans.
DG..U, DG..H, DG..N: the higher absolute pressure is connected
to port 1 or 2, and the lower absolute pressure to port 3 or 4.
The remaining ports must be tightly plugged.
The switching pressure is adjusted using a hand wheel.
Hand
wheel
(mbar)
M16x
1.5
NC
NO
COM
Screw
plug, Rp
1/4"
2
DG
Nozzle,
0.8
mm
4
Rp 1/8"
Micro
switch
3
1
Rp 1/4" Measurement point
Hand wheel
("WC/mbar
)
Screw plug,
1/4" NPT
1/2"
NPT
conduit
NC
NO
COM
2
Pilot lamp
4
1/8" NPT
Micro
switch
Filter
pad/
nozzle,
0.3 mm
11/4"
NPT
Measuremen
t point
DG..
T
Increasing
negative
pressure
Decreasing
negative
pressure
Increasing pressure
Decreasing pressure
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

DG ·Edition 08.13
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Function
3 . 4 Connection diagram
3 . 4 . 2 Pilot lamp with plug
Contacts 3 and 2 close when subject to increasing pressure. Contacts 1
and 3 close when subject to falling pressure.
All DG models (except DG..N) switch with rising pressure. The contact
switches from NC 1 to NO 2.
DG..N switches with falling pressure. The contact switches from NO 2
to NC 1.
DG..H and DG..N are locked off in their switched state and can
only be unlocked with a manual reset.
3 . 4 . 1 Blue pilot lamp for 230 V AC or for 120 V AC
3 . 4 . 3 Red/green pilot LED for 24 V DC/AC or for 230 V AC
3 . 4 . 4 Pilot LED with plug
L
1
N
O
1
3
CO
M
CO
M
NO
3
NO
NC
2
2
1
N
C
N
N
+
3
COM
N
O
2
1
N
C
3
CO
M
2
N
O
1
NC
–
N
L
1
3
NO
NC
2
1
3
CO
M
0
2
N
O
CO
M
1
N
C
L
1
N
C
1
3
CO
M
2
N
O
CO
M
1
3
N
O
2
NC
N
C
N
N
L
1
3
N
O
L
1
3
N
1
CO
M
N
O
1
2
N
2
+3
CO
M
–
1
N
O
N
C
2
1 –
2
+
3

DG ·Edition 08.13
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Function
3 . 5 Wiring
If the DG..G has switched a voltage > 24 V and a current > 0.1 A at cos
= 1 or > 0.05 A at cos = 0.6 once, the gold plating on the
contacts will have been burnt through. It can then only be operated
at this power rating or higher power rating.
When using silicone tubes, only use silicone tubes which have been
sufficiently cured. Vapours containing silicone can ad- versely affect
the functioning of electrical contacts. In the case of low switching
capacities, such as 24 V, 8 mA, for example, we recommend using
an RC module (22 Ω, 1 µF) in air con-taining silicone or oil.
DG 18I, DG 120I, DG 450I
Contacts 3 and 2 close when subject to increasing nega- tive
pressure. Contacts 1 and 3 close when subject to falling negative
pressure.
DG 1,5I and DG 12I
The connection of DG 1,5l and DG 12l depends on the positive or
negative adjusting range.
In the case of high humidity or aggressive gas components (H2S),
we recommend using a pressure switch with gold con- tact due to its
higher resistance to corrosion. Closed-circuit current monitoring is
recommended under difficult operating conditions.
All DG models (except DG . .I)
In the negative adjusting range, the template which can be found in
the unit displays the connection diagram.
Contacts 3 and 2 close when subject to increasing pressure. Contacts
1 and 3 close when subject to falling pressure.
In the positive adjusting range, remove the template and wire the
unit as shown in the engraved connection diagram.
COM
1
NC
2
NO
NC 1
NO 2
N
3
COM
µ
C = 1 µF R = 22 
NO
2
NC
1
COM
3
NO
2
NC
1
COM
3
.
DG 12I
DG 1,5I
COM
1
NC
2
NO
NC 1
NO 2
N
3
COM
µ
NO
2
NC
1
COM
3
m
5
.
r
2

DG ·Edition 08.13
12
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Isolating amplifier
1+
2+
3 –
Zone 1 or 2
Safe area
NO
COM
Isolating amplifier
1+
2+
3 –
Zone 1 or 2
Safe area
NO
10 k
COM
Function
3 . 6 DG in Zone 1 (21) and 2 (22) hazardous areas
Pressure switch DG can be used in Zone 1 (21) and 2 (22)
hazardous areas if an isolating amplifier is installed upstream
in the safe area as “Ex-i” equipment pursuant to EN 60079-11
(VDE 0170-7):2007.
DG as “simple electrical equipment” pursuant to
EN 60079-11:2007 corresponds to the Temperature class
T6, Group II. The internal inductance/capacitance is
Lo = 0.2 µH/Co = 8 pF.
The isolating amplifier transfers the DG’s signals from the
explosion-hazard area to the safe area. Depending on the de-
sign of the intrinsically safe circuit, the explosion-hazard area
can be monitored for cable faults, cable breaks or short-circuits.
Ensure that standard-compliant wiring pursuant to EN 60079
is used.
When operating in Zones 21 and 22, the 1/8" connecting thread
or the tube connection for the surrounding air or medium con-
nectionmustbeprotectedfromdirtparticlesbyaseparatefilter.
Intrinsically safe circuit without monitoring for cable faults
Intrinsically safe circuit with monitoring for cable breaks
Intrinsically safe circuit with monitoring for cable faults and
short-circuits
Isolating amplifier
1+
2+
3 –
Zone 1 or 2
Safe area
NO
10 k
COM
400 R 2 k

DG ·Edition 08.13
13
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Function
3 .7 DG on pipes with Zone 2 (22) explosive
atmospheres
Pressure switch DG can be connected to pipes/rooms in which
Zone 2 (22) explosive gases or dust are present without an
isolating amplifier.
The connection to Zone 2, Zone 22 must be implemented via
one of the two ¼"threads. Even in the unlikely event of a break
in the diaphragm, there is no danger of flashback into the sys-
tem. The pressure compensation holes on the pressure switch
(¼ " connections) have a defined ignition protection, in terms
of the safety measure for “enclosed-break devices for Group
IIA gases and vapours”, pursuant to IEC/EN 60079-15:2005.
In the case of Zone 22, it must be ensured that dirt particles
do not block the pressure supply hole (Ø = 0.8 mm).

DG ·Edition 08.13
14

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Function
3 . 8 Animation
The interactive animation shows the function of the gas pres-
sure switch DG.
Click on the picture. The animation can be controlled using the
control bar at the bottom of the window (as on a DVD player).
To play the animation, you will need Adobe Reader 7 or a newer
version. If you do not have Adobe Reader on your system, you
can download it from the Internet.
Go to www.adobe.com, click on “Adobe Reader” in the “Down-
load” section and follow the instructions.
If the animation does not start to play, you can download
it from the document library (Docuthek) as an independent
application.

DG ·Edition 08.13
15
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*On DG..T, the blue pilot lamp for 120 V AC is fitted.
** On DG..TG, the red/green pilot LED for 24 V DC/AC is fitted.

DG ·Edition 08.13
16
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Selection
4 . 2 T ype code
Code Description
DG Pressure switch for gas
DG..U, DG..H, DG..N, DG..I:
ports 1 and 2: Rp 1/4" (standard),
ports 3 and 4: Rp 1/8" (standard).
DG..B, DG..S:
port 1: Rp 1/4" (standard).
DG..T, DG..HT, DG..NT:
1,5
6
10
12
18
30
50
120
150
400
450
500
B
U
H
N
I
S
Negativepressure,adjustingrange-1,5to-0,5/+0,5to+3mbar
Adjusting range 0,4 to 6 mbar
Adjusting range 1 to 10mbar
Negative pressure, adjusting range -12 to -1/+1 to +7 mbar
Negative pressure, Adjusting range -2 to -18 mbar
Adjusting range 2,5 to 30 mbar
Adjusting range 2,5 to 50 mbar
Negative pressure, adjusting range -10 to -120 mbar
Adjusting range 30 to 150 mbar
Adjusting range 50to400 mbar
Negative pressure, adjusting range -80to-450 mbar
Adjusting range 100 to 500 mbar
Positive pressure
Positive pressure, negative pressure, differential pressure
Locks off with rising pressure
Locks off with falling pressure
Negative pressure for gas
Positive pressure only, for oxygen and ammonia
port 1: 1/4" NPT (standard) or
ports 1 and 2: 1/4" NPT (available),
T T-product
G With gold-plated contacts
Electrical connection:
port 4: 1/4" NPT (standard).
-3 via screw terminals
-4 via screw terminals, IP 65
-5 via 4-pin plug, without socket
-6 via 4-pin plug, withsocket
-9 via 4-pin plug, with socket, IP 65
K2 Red/green pilot LED for 24 V DC/AC
T Blue pilot lamp for 230 V AC
T2 Red/green pilot LED for 230 V AC
N Blue pilot lamp for 120 V AC
A External adjustment
Adjusting range, see page 23 (Adjusting range, switching
hysteresis)
DG..U,DG..H,
DG . .N, DG . .I
DG..B
DG..S
2 Rp ¼"
DG . .T,
DG. .HT, DG. .NT
2 ¼ " NPT
3
Rp 1/8"
Rp ¼ "
1
4
Rp 1/8"
Rp ¼ "
1
¼ " NPT
1
4
1/8" NPT

DG ·Edition 08.13
17

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5 Project planning information
5 .1 Installation
Installation in the vertical or horizontal position, or sometimes
upside down, preferably with vertical diaphragm.
If installed in a vertical position, the switching point pSwill
correspond to the scale value SK set on the hand wheel. If
installed in another position, the switching point pSwill change
and no longer correspond to the scale value SK set on the
hand wheel. Switching point pSmust be checked.
All DG models (except DG..I)
DG 1,5I
DG 12I
p
S
= SK
p
S
= SK + 0.5 mbar
e.g. SK = 5:
p
S
= 5 + 0,5 = 5.5 mbar
e.g. SK = -10:
p
S
= - 10 + 0.5 = -9.5 mbar
DG 18I, DG 120I, DG 450I
p
S
= SK
DG 18I: p
S
= SK + 0.5 mbar
e.g. SK = - 10:
p
S
= - 10 + 0,5 = - 9.5 mbar
DG 120I, DG 450I: p
S
= SK + 0.2 mbar
The housing must not be in contact with masonry. Minimum
clearance 20 mm.
The DG..S is suitable for oxygen and ammonia only (diaphragm made
of IIR). Do not use for fuel gases –diaphragm not resist- ant! In the
case of oxygen, ensure grease-free installation.
Continuous operation at high temperatures (e.g. maximum ambient
temperature) accelerates the ageing of elastomer materials and
reduces the service life (please contact manu- facturer). Ozone
concentrations exceeding 200 µg/m³ or gases containing more than
0.1 %-by-vol. H2S accelerate the ageing of elastomer materials and
reduce the service life.
Ports 3 and 4 are connected to the micro switch chamber. The port that is
best protected against soiling (dust/humidity) is to be left open for ventilation
(positive pressure measurement) to the atmosphere. If dust exposure in the
environment is high, a filter pad, see page 20 (Restrictor orifice), or a filter
are to be used in the open port.
Combustion gas or a mixture of combustion gas and air must not be
connected to port 3 or 4.
Condensation must not be allowed to get into the housing (if possible,
install pipework with an ascending gradient). Otherwise, there is a risk of icing
of condensation at subzero temperatures, the switching point shifting or
corrosion in the device which can lead to malfunctions.
2
1
3
4
p
S
= SK
p
S
= SK + 0.18 mbar
p
S
= SK - 0.18 mbar
p
S
= SK
p
S
= SK + 0.4 mbar
e.g. SK = 1.2:
p
S
= 1.2 + 0,4 = 1.6 mbar
e.g. SK = -1.2:
p
S
= - 1.2 + 0,4 = -0.8 mbar

DG ·Edition 08.13
18
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Project planning information > Installation
When installing outdoors, place the DL in a roofed area and
protect from direct sunlight (even IP 65 version). To avoid con-
densation, the cover with pressure equalization element can
be used, see page 19 (Pressure equalization element).
In case of highly fluctuating pressures, install a restrictor orifice,
see page 20 (Restrictor orifice).

DG ·Edition 08.13
19
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6 Accessories
6 .1 Fastening set with screws, U-shape bracket
6 . 3 External adjustment
In order to set the switching pressure from the outside, the cover for
external adjustment (6 mm Allen key) for DG..B, DG..U and DG..I can
be retrofitted.
Order No.: 74916155
For DG..B, DG..U, DG..I: Order No.: 74915387
6 . 2 Connecting set
DG..U, DG..H, DG..N, DG..I
6 . 4 Pressure equalization element
For monitoring a minimum and maximum inlet pressure puwith
two pressure switches attached to one another.
Order No.: 74912250
To avoid the formation of condensation, the cover with pres- sure
equalization element can be used. The diaphragm in the screw
connector is designed to ventilate the cover, without allowing water
to enter.
Order No.: 74923391
1
2
3
4
50 (1.97")
30 (1.18")
45 (1.77")
25 (0.98")
M4 x 12
M4 x 10
24 (0.94")
43 -0,3 (1.69")
64 (2.52")
1
2
2
3
4
1
2
2 x
1 x
6
(0.24")
16
(0.63")
4,20
+0,1
5,2
(0.17")
(0.2")
39
(1.53")
10
(0.4")
40
(1.57")

DG ·Edition 08.13
20
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Rp¼
R¼
Rp¼
Click
TEST
Rp 1/4
Accessories
6 . 5 Restrictor orifice
In the case of high pressure fluctuations, we recommend using
a restrictor orifice (contains non-ferrous metals):
Hole diameter 2 mm, Order No.: 75456321
hole diameter 3 mm, Order No.: 75441317
6 . 6 T est key PIA
To test the min. pressure switch, the DG can be vented in its
switched state using the PIA test key (contains non-ferrous
metals).
Order No.: 74329466
6 .7 Filter pad set
To protect the electrical contacts in the DG from dirt particles
in the surrounding air or in the medium, use a filter pad at
the 1/8" negative pressure port. As standard on IP 65 units.
5-piece filter pad set, Order No.: 74916199
6 . 8 T ube set
To be used with air only.
Order No.: 74912952
6 . 9 Standard socket set
Order No.: 74915388
6 .10 Standard coupler plug
Order No.: 74920412

DG ·Edition 08.13
21
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1
2
3
4
1
2
3
4
Accessories
6 .11 Pilot lamp set, red or blue
Pilot lamp, red:
110/120 V AC, I = 1.2 mA, Order No.: 74920430
220/250 V AC, I = 0.6 mA, Order No.: 74920429
Pilot lamp, blue:
110/120 V AC, I = 1.2 mA, Order No.: 74916121
220/250 V AC, I = 0.6 mA, Order No.: 74916122
6 .12 LED set, red/green
24 V DC, I = 16 mA; 24 V AC, I = 8 mA, Order No.: 74921089
230 V AC, I = 0.6 mA, Order No.: 74923275