Endress+Hauser NAR300-13 Series User manual

BA1027N/08/en/11.08
70105589
Valid as of Software-Version:1.40
Operating Instructions
Oil Leak Detector NAR 300 System

Oil Leak Detector NAR 300 system
2 Endress+Hauser
System block diagram
Oil Leak Detector NAR300 system can select from 3 type of system structure by application
Ex d System : Ex d[ia] IIB T4
This Ex d[ia] system can monitor every process of oil leak detection to alarm output at outside
hazardous area.
The circuit is IS from the Float Sensor NAR 300 to the connecting terminal box of Transmitter NRR
261(Ex d[ia]).
The Transmitter NRR 261 (Ex d[ia]) can connect directly to a junction box or gauge relay input
located outside the yard.
Float sensor NAR300-11xxxx Transmitter NRR 261-2xx (Ex d[ia])
Alarm output:
Junction box (Ex d construction)
Level gauge etc.
Power supply: AC or DC
IS exclusive cable use : 6 to 30m
TIIS: TC18322
Hazard area
EX
System block diagram

Oil Leak Detector NAR 300 system
Endress+Hauser 3
Ex [ia] System : Ex ia IIB T4
This Ex [ia] system is set up with the Transmitter NRR 262 (Ex [ia]) in a non-hazard area such as an
instrument panel room and sends the alarm output to an annunciator or upper instrument receiver. The
signal from the Float Sensor NAR 300 is sent to the Transmitter NRR 262 (Ex [ia]) through the Sensor
I/F Ex box with Ex [ia] connections.
Float sensor NAR300 - 13xxxx
Hazard area Non-hazard area
Ex [ia] exclusive cable use : 6 to 30m
Senser I/F Ex box (Ex [ia])
Transmitter NRR262- 2x (Ex [ia])
Power supply : AC or DC
Alarm output:
Annunciator,
Upper instrument receiver
Ex [ia] common shielded cable use
TIIS: TC18323
EX EX
Float sensor NAR300 - 15xxxx
Hazard area Non-hazard area
Ex [ia] exclusive cable use : 6 to 30m
Senser I/F Ex box (Ex [ia])
Transmitter NRR262 -2x(Ex [ia])
Power supply : AC or DC
Alarm output:
Annunciator,
Upper instrument receiver
Ex [ia] common shielded cable use
TIIS : TC18324 TIIS : TC18326
EX
EX
System block diagram

Oil Leak Detector NAR 300 system
4 Endress+Hauser
Ex d[ia]system : Ex d[ia] IIB T4
This Ex d[ia] system can monitor every process of oil leak detection to alarm output at outside
hazardous area.
The signal from the Float Sensor NAR 300 is received thought Sensor I/F Ex box from the Float
Sensor NAR 300 to the connecting terminal box of Transmitter NRR 261(Ex [ia]).
The Transmitter NRR 261 (Ex d[ia]) can connect directly to a junction box or gauge relay input
located outside the yard.
Float sensor NAR300-15Axxx
Transmitter NRR261-3xx (Ex d[ia])
Alarm output:
Junction box (Ex d construction)
Level gauge etc.
Power supply: AC or DC
TIIS: TC18324
Ex [ia] exclusive cable use : 6 to 30m
TIIS: TC18325
Sensor I/F Ex box (Ex [ia])
Hazard area
EX
System block diagram

Oil Leak Detector NAR 300 system
Endress+Hauser 5
Table of Contents
Table of Contents
1 Safety instructions . . . . . . . . . . . . . . . . 6
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Installation, commissioning and operation . . . . . . . . 6
1.3 Note for Handing . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.5 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.6 Software history . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.7 Contact addresses of Endress+Hauser . . . . . . . . . . . 7
1.8 Notes on safety conventions and symbols . . . . . . . . . 8
2 Identification . . . . . . . . . . . . . . . . . . . . 9
2.1 Float sensor NAR 300 Nameplate . . . . . . . . . . . . . . 9
2.2 Product structure . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.4 Operating Manual (BA 027N, this booklet) . . . . . . 14
3 Delivery example of each Order Code 15
4 Instruction for use . . . . . . . . . . . . . . . 17
4.1 Detection Sensitivity . . . . . . . . . . . . . . . . . . . . . . . 17
4.2 Water in a pit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5 Installation . . . . . . . . . . . . . . . . . . . . 18
5.1 Float Sensor NAR 300 . . . . . . . . . . . . . . . . . . . . . . 20
5.2 Transmitter NRR 261 . . . . . . . . . . . . . . . . . . . . . . 21
5.3 Transmitter NRR 262 . . . . . . . . . . . . . . . . . . . . . . 24
5.4 Sensor I/F Ex box . . . . . . . . . . . . . . . . . . . . . . . . . 24
6 Electrical connection . . . . . . . . . . . . . 25
6.1 Transmitter NRR 261 . . . . . . . . . . . . . . . . . . . . . . . 25
6.2 Transmitter NRR 262 . . . . . . . . . . . . . . . . . . . . . . . 26
6.3 Transmitter NRR 262 . . . . . . . . . . . . . . . . . . . . . . . 27
6.4 Principle of Alarm operation . . . . . . . . . . . . . . . . . . 28
7 Adjustment . . . . . . . . . . . . . . . . . . . . . 29
7.1 Transmitter adjustment . . . . . . . . . . . . . . . . . . . . . 29
8 Troubleshooting . . . . . . . . . . . . . . . . . 30
8.1 Fail safe (alert when not oil leak) . . . . . . . . . . . . . . 30
8.2 Alarm delay (no alert when oil leak) . . . . . . . . . . . . 31
8.4 Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9 Operation check . . . . . . . . . . . . . . . . . 37
10 Maintenance . . . . . . . . . . . . . . . . . . . . 38
11 Accessory . . . . . . . . . . . . . . . . . . . . . . 39
11.1 Float guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
11.2 U bolt and Cable gland . . . . . . . . . . . . . . . . . . . . . 39

Oil Leak Detector NAR 300 system
6 Endress+Hauser
1 Safety instructions
1.1 Designated use
The Oil Leak Detector NAR 300 System uses two types of detection principles: conductivity and
tuning-fork.
This system is set up in a pit, dike or plant, the sump pit near the pump yard, where it provides the
ultimate leak ditection function for oils and vegetable oil.
Explosion-proof system:
With the Transmitter NRR 261 (outside setting) use, connect to the switch input mechanism such
as a existing Level Gauge, Transmitter directly and can send the alarm.
IS system:
Using in combination the Converter NRR 262 (inside setting) and the Sensor I/F Ex box (outside
setting), can establish the alarm system.
1.2 Installation, commissioning and operation
• Mounting, electrical installation, start-up and maintenance of the instrument may only be carried
out by trained personnel authorized by the operator of the facility.
• Personnel must absolutely and without fail read and understand this Operating Manual before
carrying out its instructions.
• The instrument may only be operated by personnel who are authorized and trained by the oper-
ator of the facility. All instructions in this manual are to be observed without fail.
• The installer must make sure that the measuring system is correctly wired according to the wiring
diagrams. The measuring system is to be grounded.
• Please observe all provisions valid for your country and pertaining to the opening and repairing of
electrical devices.
1.3 Note for Handing
Power cable
• Use cables recommended by Endress+Hauser.
• Be sure to ground the cables. For details, refer to "Electrical Connections" and "Installation"
Grounding
• Do not remove a ground terminal or wire power is on.
• For details, refer to "Electrical Connections"
External connection
If external connections are required, before connecting the device to an external control circuit,
provide
protective grounding
Caution!
Changes or modifications not expressly approved by the party responsible for compliance could void
the user’s authority to operate the equipment.
1 Safety instruction

Oil Leak Detector NAR 300 system
Endress+Hauser 7
1.4 Return
The following procedures must be carried out before the Oil Leak Detector NAR 300 system sent
to Endress+Hauser for repair:
• Always enclose a duly completed "Declaration of Contamination" form. Only then can Endress
+Hauser transport, examine and repair a returned device.
• Enclose special handling instructions if necessary, for example, safety data sheet as per EN
91/155/EEC.
• Remove all residue which may be present. Pay special attention to the gasket grooves and crevices
where fluid may be present. This is especially important if the fluid is dangerous to health, e.g.
corrosive, poisonous, carcinogenic, radioactive, etc.
A copy of the “Declaration of Contamination” is included at the end of this operating manual.
Caution!
• No instrument should be sent back for repair without all dangerous material being completely
removed first, e.g. in scratches or diffused through plastic.
• Incomplete cleaning of the instrument may result in waste disposal or cause harm to personnel
(burns, etc.). Any costs arising from this will be charged to the operator of the instrument.
1.5 Disposal
In case of disposal, please separate the different components according to their material consistency.
1.6 Software history
1.7 Contact addresses of Endress+Hauser
The addresses of Endress+Hauser are given on the back cover of this operating manual. If you have
any questions, please do not hesitate to contact your E+H representative.
Software version / Date Software changes Documentation changes
OILEYE CI/ST V. 1.40/11.03 Original software.
1 Safety instruction

Oil Leak Detector NAR 300 system
8 Endress+Hauser
1.8 Notes on safety conventions and symbols
In order to highlight safety-relevant or alternative operating procedures in the manual, the following
conventions have been used, each indicated by a corresponding symbol in the margin.
Symble Meaning
Warning!
A warning highlights actions or procedures which, if not performed correctly,
will lead to personal injury, a safety hazard or destruction of the instrument
Caution!
Caution highlights actions or procedures which, if not performed correctly, may
lead to personal injury or incorrect functioning of the instrument
Note!
A note highlights actions or procedures which, if not performed correctly, may
indirectly affect operation or may lead to an instrument response which is not
planned
Device certified for use in explosion hazardous area
If the device has this symbol embossed on its name plate, it can be installed in
an explosion hazardous area
Explosion hazardous areas
Symbol used in drawings to indicate explosion hazardous areas.
– Devices located in and wiring entering areas with the designation
“explosion hazardous areas” must conform with the stated type of
protection
Safe area (non-explosion hazardous area)
Symbol used in drawings to indicate, if necessary, non-explosion hazardous
areas.
– Devices located in safe areas still require a certificate if their outputs run into
explosion hazardous areas
Direct voltage
A terminal to which or from which a direct current or voltage may be applied or
supplied
Alternating voltage
A terminal to which or from which an alternating (sine-wave) current or voltage
may be applied or supplied
Grounded terminal
A grounded terminal, which as far as the operator is concerned, is already
grounded by means of an earth grounding system
Protective grounding (earth) terminal
A terminal which must be connected to earth ground prior to making any other
connection to the equipment
Equipotential connection (earth bonding)
A connection made to the plant grounding system which may be of type e.g.
neutral star or equipotential line according to national or company practice
EX
EX
1 Safety instruction

Oil Leak Detector NAR 300 system
Endress+Hauser 9
2 Identification
2.1 Float sensor NAR 300 Nameplate
Information on the nameplate of the Float Sensor NAR 300
N
A
R
3
0
0
Ser. No.
Cable Length
N
P
-
2
4
9
6
-
2
㽲㽳㽲㽳Serial No.
Cable length䇭䋨order code”40”䋩2 Identification

Oil Leak Detector NAR 300 system
10 Endress+Hauser
Ex d[ia] system (NAR300-11xxxx+NRR261-2xx system)
Ex [ia] system (NAR300-13xxxx+NRR262-2x system)
ԘԙԚԛ
NRR261-
NRR261
NP - 2478-2
ᧄ቟࿁〝2:
Uo҇V Io҇mA Po҇mW
Co҇ǴF Lo҇80mH
㔚ޓޓḮ:
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ỺὅἛἾἋἡỸἈὊޛషఇࡸ˟ᅈ
Yamanashi 406-0846
㽲㽳㽴SAP cord
Serial No.
Explosion-proof type
㽵Power supply
NRR261-2xx
ഭᐔᬌ╙6%ภ
ࠛࡦ࠼࡟ࠬࡂ࠙ࠩ࡯ጊ󰩙ᩣᑼળ␠
02
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Uo҇V Io҇mA
Po҇OW
Co҇0.25ǴF Lo҇80mH
NRR263-
NRR263
ṳᴤᬌ಴ⵝ⟎04ṳᴤᬌ಴ེ0#4㒐῜ᕈ⢻ޓޓ'ZKCΤ$6
NP-2487-2

ỺὅἛἾἋἡỸἈὊޛషఇࡸ˟ᅈ
ᵈᗧ㧦࡮ᯏེౝㇱߩㇱຠ෸߮㈩✢ߩᄌᦝޔᡷㅧ╬ࠍⴕࠊߥ޿ߢߐ޿ޕ࡮⸵ኈ󰶘ᐲએߩࠤ࡯ࡉ࡞ࠍ૶↪ߒߡߐ޿ޕ࡮ขᛒ⺑᣿ᦠ$#ࠍෳᾖߒߡߐ޿ޕ
NP-2488-2
ỺὅἛἾἋἡỸἈὊޛషఇࡸ˟ᅈ
㽲
㽳Serial No. 㽲㽳SAP cord
ഭᐔᬌ╙6%ภ
ࠛࡦ࠼࡟ࠬࡂ࠙ࠩ࡯ጊ󰩙ᩣᑼળ␠
02
㽲㽳㽴NRR262-2x
NP-2480-2
ṳᴤᬌ಴ⵝ⟎ޓ04ᄌ឵ེޓ044㒐῜ᕈ⢻ޓޓ'ZKCΤ$6
ᵈᗧ㧦
ޓ࡮044ߪޔ㕖ෂ㒾႐ᚲߦ⸳⟎ߒߡߊߛߐ޿ޕޓ࡮ᯏེౝㇱߩㇱຠ෸߮㈩✢ߩᄌᦝޔᡷㅧ╬ࠍޓޓⴕߥࠊߥ޿ߢߐ޿ޕ࡮⸵ኈ󰶘ᐲએߩࠤ࡯ࡉ࡞ࠍ૶↪ߒߡߐ޿ޕޓ࡮ขᛒ⺑᣿ᦠ$#ࠍෳᾖߒߡߐ޿ޕ
๟࿐󰶘ᐲ㧦60㔚ޓޓḮ:
㕖ᧄ቟࿁〝㧦⸵ኈ㔚࿶㧦#%8*\&%8ᧄ቟࿁〝:
Uo҇V Io҇mA Po҇W
NRR262-
NRR262
ỺὅἛἾἋἡỸἈὊޛషఇࡸ˟ᅈ
Yamanashi 406-0846
SAP cord
Serial No.
Power supply
2 Identification

Oil Leak Detector NAR 300 system
Endress+Hauser 11
Ex [ia] Sensor I/F Ex box, Extended type (NAR300-15xxxx )
Ex [ia] transmitter, Extended type (NRR262-2x )
๟࿐󰶘ᐲ㧦60ⵍ󰶚ቯ‛󰶘ᐲ㧦60ᧄ቟࿁〝㔚Ḯ࿁〝:
Ui=V, IimA, PiW,
Li48ǴH, Ci: ήⷞߢ߈ࠆ୯ᧄ቟࿁〝2:
UoV, IomA, PoOW,
Lo80mH, Co0.25ǴF
NAR300-15A
NAR300
ṳᴤᬌ಴ེ1TFGTEQFGෳᾖ㒐῜ᕈ⢻ޓޓ'ZKCΤ$6
NP-2570-1
ỺὅἛἾἋἡỸἈὊޛషఇࡸ˟ᅈ
ᵈᗧ㧦࡮ᯏེౝㇱߩㇱຠ෸߮㈩✢ߩᄌᦝޔᡷㅧ╬ࠍⴕࠊߥ޿ߢߐ޿ޕ࡮⸵ኈ󰶘ᐲએߩࠤ࡯ࡉ࡞ࠍ૶↪ߒߡߐ޿ޕ࡮㒐῜ᵈᗧ㗄⺑᣿ᦠ'Zޓ:,ࠍෳᾖߒߡߐ޿ޕ
NP-2571-1
ỺὅἛἾἋἡỸἈὊޛషఇࡸ˟ᅈ
㽲㽳㽲㽳
ഭᐔᬌ╙6%ภ
ࠛࡦ࠼࡟ࠬࡂ࠙ࠩ࡯ጊ󰩙ᩣᑼળ␠
02
SAP cord
Serial No.
ᄌ឵ེ%QPXGTVGT1TFGT%QFGෳᾖ4GHGTVQ1TFGT%QFG㒐῜ᕈ⢻2TQVGEVKQPENCUU='ZKC?Τ$ᧄ቟࿁〝+PVTKPUKECNN[UCHGEKTEWKVUo=V, Io=mA, Po=W, Co=ǴF, Lo=3.05mH
㔚ޓޓḮ2QYGTUWRRN[⸵ኈ㔚࿶7O㧦#%8*\&%8㕖ᧄ቟࿁〝PQP+PVTKPUKECNN[UCHGEKTEWKV๟࿐󰶘ᐲ#ODKGPVVGORGTCVWTG60NP - 2573-1
Note : ࡮044OWUVDGKPUVCNNGFKPPQPJC\CTFQWUCTGC࡮&QPQVOQFKH[KPVGTPCNRCTVUQTEKTEWKVU࡮4GHGTVQ'ZKPUVTWEVKQPOCPWCN'Z:,ᵈᗧ㧦࡮
044ߪޔ㕖ෂ㒾႐ᚲߦ⸳⟎ߒߡߊߛߐ޿ޕ
࡮ᯏེౝㇱߩㇱຠ෸߮㈩✢ߩᄌᦝޔᡷㅧ╬ߪⴕࠊߥ޿ߢߊߛߐ޿ޕ࡮
㒐῜ᵈᗧ㗄⺑᣿ᦠ'Z:, ࠍෳᾖߒߡߐ޿ޕ
NRR262-2
NRR262
ỺὅἛἾἋἡỸἈὊޛషఇࡸ˟ᅈ
Yamanashi 406-0846
㽲㽳㽴NRR262-2x
ഭᐔᬌ╙6%ภ
ࠛࡦ࠼࡟ࠬࡂ࠙ࠩ࡯ጊ󰩙ᩣᑼળ␠
02
㽲㽳㽴SAP code
Serial No.
Power supply
2 Identification

Oil Leak Detector NAR 300 system
12 Endress+Hauser
Ex d[ia] transmitter, Extended type (NRR261-3xx )
ԘԙԛԚᧄ቟࿁〝: +PVTKPUKECNN[UCHGEKTEWKVUo=V IomA PoW
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NRR261-3
NRR261
Note
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Wait 10 minutes after power shut off when opening cover.
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NRR261-3
ỺὅἛἾἋἡỸἈὊޛషఇࡸ˟ᅈ
Yamanashi 406-0846
㽲㽳㽴㽵NRR261-3xx
ഭᐔᬌ╙6%ภ
ࠛࡦ࠼࡟ࠬࡂ࠙ࠩ࡯ጊ󰩙ᩣᑼળ␠
02
SAP cord
Serial No.
Ex-proof model
Power suppy
2 Identification

Oil Leak Detector NAR 300 system
Endress+Hauser 13
2.2 Product structure
2.2.1 Float Sensor NAR 300
10 Approval
1 Ex [ia] IIB T4, TIIS
9 Special version
20 Sensor Type
1Float
2 Float + Module set (Econounce)
4 Float + Ex box(Econounce)
5 Float + Ex box (extended range)
9 Special version
30 Signal Output
A 2-wire current
YSpecialversion
40 Signal Cable
A6m
B 10 m
C 15 m
D 20 m
E 25 m
F 30 m
YSpecialversion
50 Float Guide
1Notused
2 Material mild steel
3 Material SS304
9 Special version
60 Cable Entry
A Not selected
B PF (G)1/2
CNPT1/2
DPg16
EM25
YSpecial version
NAR300- Complete product designation
2 Identification

Oil Leak Detector NAR 300 system
14 Endress+Hauser
2.2.2 Transmitter NRR 261
2.2.3 Transmitter NRR 262
2.3 Scope of delivery
• Instrument according to the version ordered
• Operating manual (this manual)
2.4 Operating Manual (BA1027N, this booklet)
Describe the installation and commissioning of the Oil Leak Detector NAR300.
10 Approval
2 Ex d [ia] IIB T4, TIIS (NAR 300)
3 TIIS Ex d [ia] IIB T4 (extended range)
9 Special version
20 Power Supply
A 90-250VAC
B 22-26VDC
Y Special version
30 Cable Entry
A G PF3/4 x 2 (Ex d)
B NPT3/4 x 2 (Ex d)
C Pg16 x 2 (Ex d)
D M25 x 2 (Ex d)
E G PF3/4 x 2 (Ex d) + G PF 1/2 x 1 (Ex ia)
K G PF1/2 x 2 (Ex d) + G PF 1/2 x 1 (Ex ia)
Y Special version
NRR261- Complete product designation
10 Approval
2 Ex [ia] IIB T4, TIIS (NAR 300)
9 Special version
20 Power Supply
A 90-250VAC
B 22-26VDC
Y Special version
NRR262- Complete product designation
2 Identification

Oil Leak Detector NAR 300 system
Endress+Hauser 15
3Delivery example of each Order Code
Float Guide (stick) separate packing
U bolt for mounting
Float Guide
*Weight
*(This weight is set in the bottom of Transmitter packing box)
Float Sensor Transmitter
Check tool
Float Sensor order code
NAR300 - ＊1 ＊＊2 or 3 ＊A
Transmitter order code
NRR261 - 2 ＊＊Cable gland
Float Guide (stick) separate packing
Float Guide
*1
Weight
Float sensor
Transmitter
Check tool
Float sensor order code
NAR300 - ＊3 or 5＊＊2 or 3 ＊A
Transmitter order code
NRR262 - 2 ＊＊
*2
+-GND
Delay
Timer
Power Output Monitor
Sensor
Input
*2
Sensor I/F Module Box
Cable gland U bolt for mounting
included in order code NAR300-13xxxx or NAR300-15xxxx.
Ex [ia] system is used with Tramsmitter NRR 262-2x.
*1
(this weight is packed in bottom of box with transmitter)
3 Delivery example of each Order Code

Oil Leak Detector NAR 300 system
16 Endress+Hauser
Float sensor Check tool
Float sensor order code Transmitter order code
NAR300 - 1 5 x x 2 or 3 A NRR261 - 3 x x
Transmitter
Cable gland
mounting U bolt
Float guide
Float guide bar
(separate packing from weight)
Weight :
(this weight packed in bottom of box with transmitter)
*Sensor I/F Ex box Cable gland mounting U bolt
* included in order code NAR300-15xxxx.
Ex d[ia] system is used with Tramsmitter NRR261-3x.
4 Instruction for use

Oil Leak Detector NAR 300 system
Endress+Hauser 17
4 Instruction for use
4.1 Detection Sensitivity
Depending on actual condition, watar may sometimes cling to the electrode, even though the sensor
is floating on oil above the water (see figure 3). In such case, oil detection sensitivity may be affected
by 1 to 2 mm. When absolute precision is required we recommend coating the electrode with a
mild detergent in order to keep water from clinging to the electrode.
Water clinging to the electrode
4.2 Water in a pit
Impossible to use on sea water
Float sensor is not designed for using on sea water. There may be the following troubles, when using
it on sea water.
• When Float Sensor is overturned by ocean waves, non-alarm or the alarm delay may occur.
• When the bypass is generated between the conductive sensor and float body by sea salt, alarm
delay may occur.
• Float Sensor is corroded by the sea salt
Particular water in a pit
When using the Float Sensor on particular water such as a solvent blend, it may be corroded and
damaged.
High electrical resistance water in a pit
When using the Float Sensor on high electrical resistance water such as a steam drain or pure water,
an alarm may ring. Eelectric conductivity should be ≥10μS/cm and ≤100kΩ⋅cm.
As an example:
Pure water - 1 to 0.1μS/cm (1 to 10MΩ⋅cm)
The water freezing in a pit
When water in the pit freezes , the water in a pit, the alarm may ring (fail safe function). Please
implement countermeasures to prevent freezing.
Water
Oil
Conductivity
Tuning-fork
5 Installation

Oil Leak Detector NAR 300 system
18 Endress+Hauser
5 Installation
*1: We recommend to set up a rubbish guard, a roof and a cover in order not to allow rubbish and
snow into the pit.
When snow accumulates on the Float Sensor, the sensitivity declines as the draft increases to
1mm per 50g.
Also, when the ambient temperature might be over 50 °C, set up a sun shade to avoid direct
sunlight.
In downpour, just in case the water in pit overflow, mount the pit cover higher than the pit in
order not to submerge the housing of float sensor in the water.
If the float sensor is submerged, it becomes the source of troubles and breakages.
*2: When the float sensor is out of balance (approx. gradient of 3 degree and over), it may cause a
malfunction and alarm delay. Please set up the float guide and pay attention to the placement
of cable and chain.
*3: Please mount a screen to prevent rubbish at inlet entrance of the water and conduct
periodical check and cleaning due to prevent the error caused by rubbish and foreign substances
that block up the pit and the sensor.
*4: It is convenient to attach a chain to the ring of sensor head side preliminarily. But the sensitivity
declines as the draft increases to 1mm per 50g (load increment of Float).
When using the chain to prevent the float sensor flowage, please do not pull the chain when
checking.
*5: When the water in the pit is full, even if the oil leaks, oil layer is not formed in the pit.
*6: Do not pull the sensor by its cable. Doing so may damage the sensor.
*1
*3
*2
*5
U Bolt
JIS F3022 B50
*4
*6
U Bolt
JIS F3022 B50
*8
*9
Max.
100mm
*10
*10
Sensor I/F Ex box
transmitter NRR262
transmitter NRR 261
Alarm Input
Dike
Drain
Discharge nozzle *7
Pit cover Chain
Fence
Special cable
Valve
Cable
Float Sensor 300Weight
Pit
Float guide
Screen
U-shaped drainageway
U Bolt
JIS F3022 B50
Ex d[ia]
*10
transmitter NRR 261
Ex d[ia]
Alarm Input
Ex [ia]
5 Installation

Oil Leak Detector NAR 300 system
Endress+Hauser 19
*7: When the valve is kept open, please shape the oil layer by curving the nozzle down 100 mm
and over.
When the oil outflows from the pit before the detectable oil layer is shaped, it may cause on
alarm failure or delay.
In case of the pit without discharge nozzle, please create the condition which the oil layer is
shaped using a divider which separates oil from water.
*8: If necessory, please set up a divider to prevent the extreme wave, crosscurrent and dropping of
the liquid on the float.
*9: If a pit is too wide, oil layer may be too thin to detect.
If the oil leak layer is not thick enough, the oil cannot be detected.
*10: Please mount the NAR 300, NRR 261 and I/F Ex box at least 50 cm away from each other.
5 Installation

Oil Leak Detector NAR 300 system
20 Endress+Hauser
5.1 Float Sensor NAR 300
5.1.1 Handling Instructions
Do not carry the float sensor by holding the cable as below fig.
When carrying it, please make sure to hold it with both hands.
When lifting and holding the sensor, take care not to remove the top cover.
5.1.2 Float guide mounting
The Float Sensor NAR 300 can install in the float guide for our existing products (CFD10, CFD30,
UFD10, NAR291, NAR292)
Do not hold and pull this parts
Do not rotate the housing
200
350
200 250
10
200
10
L
10
260
Nut M10
Float Guide Two holes for Guide
Weight
5 Installation