OPERATING AND INSTALLATION INSTRUCTIONS
Conductivity Operated Level Control System
Having SIRA Approved Intrinsically Safe Electrode Circuits
Conforming to the ATEX Directive 94/9/EC
Controller type P7/I.S. Certificate No SIRA03ATEX2160X
Electrode Holders Certificate No SIRA03ATEX2159X
Conductivity Operated Level Control System
Certificate No Ex03E2161
Contents Page
1.0 System Overview 3
2.0 Operating Principle 3
3.0 General Description and Installation 4
4.0 P7/IS Controller 6
4.1 Essential information 6
4.1.1 Identification 6
4.1.2 General information 6
4.1.2.1 Special Conditions for Safe Use 7
4.1.3 Hazardous and safe area parameters 7
4.1.4 Electrical connection & housing 7
4.2 Setting up the P7/IS Controller 8
4.2.1 Single electrode applications 9
4.2.2 Dual electrode applications 10
4.2.3 Basic controller testing 10
4.3 Technical specification 12
5.0 Electrode Holders 13
5.1 Cat 1 Electrode holders 13
5.1.1 Type identification 13
5.1.2 Certification markings 14
5.1.3 Conditions of use 14
5.1.4 Special conditions for safe use 15
5.2 Installation 15
6.0 Cable Properties 16
6.1 Cable inductance 16
6.2 Cable capacitance 17
6.3 Electrode capacitance 17
6.4 Cable selection guide 17
7.0 System information 18
7.1 Equipment located in the none hazardous area 18
7.2 Equipment located in a hazardous area 18
7.3 Configuration 19
7.4 Permissible interfacing cables 19
Appendix
System Installation Drawing 20
Declarations of Conformity 21, 22
Page 2 of 22
Hawker Electronics Ltd
HAWKER ELECTRONICS LTD.
The user should read this manual prior to installation or commissioning.
1. SYSTEM OVERVIEW
When used with Hawker electrodes, the P7/I.S. level controller forms an INTRINSICALLY
SAFE Level Alarm or Control System. The controller is situated in the Safe Area and the
electrodes in the Hazardous Area. This manual gives details of the P7/I.S controller,
electrode holders and the overall system.
2. OPERATING PRINCIPLE
The controller supplies a small AC current to the electrodes. The Level Controller detects
this current when an electrically conductive liquid touches the measuring electrode. A.C is
used to prevent electrolytic action between electrodes. When the presence of a liquid is
detected the unit either de-energises or energises its internal relay dependent on the failsafe setting, providing the user with a set of volt free S.P.C.O contacts. The unit may be
used for High or Low alarm using the P1 connection and G, or for control using P1, P2 and
G. Where the P1 is the shortest electrode, the G electrode must be the longest electrode
in the vessel.
• Intrinsically safe circuit allows use in explosion-hazardous area.
• Electrode circuits are electrically isolated from earth.
• Adjustable sensitivity and close switching differential to ignore electrode fouling.
• Single and double electrode operation for alarm or control applications.
• Fail safe operation.
• Wide range of approved hardware for Cat 1 (Zones 0, 1 & 2) applications.
• Finely tuned accuracy using well-proven technology.
P7/I.S.
Intrinsically Safe
Conductivity Level Controller
Birmingham, B45 9AL
Tel: 0121 453 8911
Fax: 0121 453 3777
Page 3 of 22
3.0 GENERAL DESCRIPTION AND INSTALLATION
IMPORTANT
The P7/IS Controller, Holder and Electrode products must only be installed by suitably
trained personnel who have the necessary experience in installation, connection and
commissioning of instrumentation in explosion-hazardous areas, and are familiar with the
relevant codes of practise.
The units contain NO USER SERVICEABLE PARTS. Each product carries an
identification label, which shows its type and other important information.
1. The P7/I.S. is a conductivity operated level controller having approved intrinsically
safe electrode circuitry, which complies with the latest European Harmonised
Standards.
2. The P7/I.S. controller must be installed in the ‘safe’ area in a control panel or other
protective housing. To comply with the certification, only approved Hawker level
sensing electrode holders bearing the approved label, may be used in the
‘hazardous’ area.
3. The maximum operating temperatures must be taken into consideration when using
single and multiple systems in different enclosure configurations i.e. panels.
Adequate spacing, ventilation or cooling should be provided. Ambient operating
temperature ranges other than -20°C to +40°C will be indicated on the product
label. The equipment is intended to be used only in dry, clean and well-controlled
environments.
4. The certificate stipulates that the controller must always be housed in its enclosure,
even when fitted in a control panel. Separate conduit entries must be used for I.S
and mains/high voltage circuits.
5. The output relay gives the user a single pole volt free changeover contact, which its
Load must not exceed 100VA
Current must not exceed 5amps
Voltage must not exceed 250V
The volt free contact is for ‘safe’ area use
6. The P7/IS controller requires the connection of a mains earth to its (earth)
terminal for safety and not for functionality. It should be noted that all other
terminals including the electrode circuitry P1, P2 and G are electrically isolated from
the earth terminal.
7. The electrodes are certified for use in specific zones, check before specifying or
installing. The electrode circuitry is electrically isolated from earth.
8. The maximum number of Holders, which may be installed in any one tank, sump or
vessel, depends on the gas classification for the hazardous area in which the
systems are installed. See system section and drawing 2920.
Page 4 of 22
For safety reasons the maximum values of Inductance and Capacitance for holders,
electrodes and cables must not exceed that stated in drawing 2920. It is worth
noting that there is also a maximum capacitance value for controller functionality.
9. For multiple controller systems where a common multicore is used for the outputs
the cable must be a Type “A” or Type “B” as defined in EN 50039:1980. If individual
cables (or individual wires) are used for each controller output then they do not
have to meet these requirements, see system section.
10. Supporting Standards used for certification. The electrical installation of the
controller, electrode and electrode wiring must also comply -
“Hawker Electronics” drawing 2920
BS EN 50039:1980 / BS EN 60079-14 1997
EN 50014:1997(A1-A2)
EN 50020:1995
EN 50284:1997
And any other current relevant standards.
11. Hazards arising from power failure.
Where equipment and protective systems can give rise to a spread of additional
risks in the event of a power failure, it must be possible to maintain them in a safe
state of operation independently of the rest of the installation; this is the
responsibility of the user.
12. Hazards arising from connections.
Equipment and protective systems must be fitted with suitable cable and conduit
entries.
When equipment and protective systems are intended for use in combination with
other equipment and protective systems, the interface must be safe. The user is
responsible for the provision of suitable cable for connection to the supplied
terminals.
13. Care should be taken not to clean with aggressive substances or substances that
may damage the enclosure, terminals or label. Use of a mild detergent with a
dampened cloth is recommended.
14. If the sign ‘X’ is placed after the certificate number, it indicates the equipment is
subject to special conditions of safe use specified on the EC - Type Examination
Certificate, details of which are included with this manual.
15. The crossed-out bin symbol, placed on the product, reminds you of the need to
dispose of the product correctly at the end of its life
Page 5 of 22
P7/IS CONTROLLER
4.1 Essential information
4.1.1 Identification
Controller Type P7/IS - Certificate Sira 03ATEX2160X
The certification marking is as follows
4.1.2 General information
1. The equipment must only be installed in a non-hazardous (safe) area.
2. The equipment is only certified for use in ambient temperatures in the range -20oC
to +40oC and should not be used outside this range.
3. The equipment has not been assessed as a safety-related device (as referred to by
Directive 94/9/EC Annex II, clause 1.5).
4. Installation of this equipment shall be carried out by suitably-trained personnel in
accordance with the applicable code of practice.
5. Repair of this equipment shall only be carried out by the manufacturer or in
accordance with the applicable code of practice.
6. The certification of this equipment relies on the following materials used in its
construction:
Enclosure: Polycarbonate
If the equipment is likely to come into contact with aggressive substances, then it is the
responsibility of the user to take suitable precautions that prevent it from being adversely
affected, thus ensuring that the type of protection is not compromised.
“Aggressive substances”- e.g. acidic liquids or gases that may attack metals or
solvents that may affect polymeric materials.
“Suitable precautions”- e.g. regular checks as part of routine inspections or
establishing from the material’s data sheet that it is
resistant to specific chemicals.
Example label contains all relevant
details for the particular model.
The parameters will vary between
models.
Page 6 of 22
4.1.2.1 Special Conditions for Safe Use
(denoted by an X after the certificate number)
The supply to the equipment is limited to overvoltage category I/II as specified in
IEC 60664-1.
4.1.3 Hazardous and safe area parameters
Hazardous Area Terminals
Uo 23V
ΙΙΙΙo 35.6 mA (2 channels, each 17.8 mA)
Po 0.1 W
Group ΙΙΙΙΙΙΙΙC Group ΙΙΙΙΙΙΙΙB Group ΙΙΙΙΙΙΙΙA
Co 0.143 µF 1.03 µF 3.71 µF
Lo 27.8 mH 102.08 mH 213.74 mH
Lo/Ro 250 µH/Ω 947 µH/Ω 1786 µH/Ω
Safe Area terminals
Um 250V
Terminals NC, C, NO are connected to internal relay contacts. These relay contacts must
not switch more than 5A r.m.s or 250V r.m.s or 100 VA.
4.1.4 Electrical connection and housing
The electrical connections are made to the terminal blocks situated on the front of the
enclosure via captive self-locking screws.
The “Hazardous Area” connections are on the top consisting of P1, P2 & G terminals;
these go to the electrodes in the vessel. Various Hawker data sheets are available giving
P1, P2 & G configurations for pumping in/out and alarms etc. they can also be found on
the company web site.
The “Safe Area” terminals are on the bottom, which consist of the ac supply, Earth and
Volt free relay contacts; these are for Safe Area use only.
Page 7 of 22
mm
Certified drawing 2920 included in this manual gives specific information for installation
and additional requirements for multiple system configurations, which should be strictly
adhered to.
The housing can be mounted either by means of screws passed through two holes to DIN
46 121 and DIN 43 660 or by a snap fastener for fitting to DIN 46 277 and DIN EN50 022
assembly rails.
4.2 Setting up the P7/I.S controller
Different versions of the controller are available; see the P7/IS technical specifications for
ordering information. Always check to ensure the controller specifications are suited to the
supply and its application before installing.
The input supply, fail-safe setting and sensitivity are fixed at the factory; the controller’s
label will indicate its fail-safe as either FSH (H) or FSL (L) and its supply voltage.
Removing the front snap on trim will reveal the sensitivity control and a red Led. The relay
is energised when the Led is ‘ON’.
In general increasing the sensitivity control increases the sensitivity of the unit, i.e.
increasing it will make the unit switch with cleaner liquids (less conductive), this is where
we are not concerned with ‘ragging’ etc.
Page 8 of 22
Turning the sensitivity control anticlockwise decreases the sensitivity, giving optimum
control and switching differential over dirtier liquids such as sewage, this is useful where
ragging can be a problem.
If the liquid is too high a resistance (not very conductive) the unit may not switch even
when the control is turned fully clockwise. Conversely if the resistance is very low a few
tens of ohms the liquid will be detected but with limited switching differential. It is worth
bearing these few points in mind if having difficulty in sensing a liquid.
See technical data sheet for switching specifications. Please consult our sales department
for guidance if unsure.
Facia Trim
Basic instructions are included on the facia trim, but it is recommended that this manual be
used for optimum performance. No attempt should be made to remove this trim.
Precautions before testing.
Before disconnecting any mains leads or control wiring at the controller or in the system
ensure that:
a) Mains supply to the controller is OFF.
b) The volt free contact wires supply is switched OFF.
c) The Safety Officer has declared it is safe for the equipment to be disconnected or
4.2.1 Single electrode applications P1 & G.
Instruction Relay Condition
FSH FSL
Fill the vessel until liquid is in
Contact with the electrode.
Turn sensitivity control to ‘max’. de-energised energised
Turn sensitivity control slowly
anticlockwise until relay energises de-energises
changes state.
Turn control clockwise 1 division, de-energises energises
this is the optimum setting
for the particular liquid.
removed and that it is safe to perform the following operations bearing in mind any
hazardous area implications such as application and connections.
Page 9 of 22
4.2.2 Dual electrode applications P1, P2 & G
Instruction Relay Condition
FSH FSL
Fill the vessel until liquid is in
Contact with the P2 electrode.
Turn sensitivity control to ‘max’. energised de-energised
Using a piece of wire, place a
Momentary short circuit between de-energises energises
P1 & G.
Remove Short circuit. Relay remains- de-energised energised
Turn sensitivity control slowly
anticlockwise until relay changes state. energises de-energises
Turn potentiometer clockwise
By 1 division, this is the optimum
setting for the particular liquid.
Note: If the above adjustment is not possible, the resistance of the liquid may be outside
the range of the controller. In which case please consult our sales department.
Following adjustment it is advisable to carry out a full operating cycle to ensure
correct operation.
4.2.3 Basic controller testing
If necessary the controller can be tested without connecting to the electrode holders so its
correct basic function and the user relay contacts can be checked. This test will not
test
the unit’s capacity to sense a liquid of a specific conductance.
For fail to safe Low Unit: -
Disconnect all electrode wiring from the terminal block.
Turn on the mains supply to the controller.
Turn the sensitivity control to midway.
Short circuit P2 & G, the relay should be de-energised.
Short circuit P1 & G, the relay should energise.
Remove the P1 & G short, the relay should remain energised.
Remove the P2 & G short, the relay should de-energise.
8. Goto step 16.
For fail to safe High Unit: -
9. Disconnect all electrode wiring from the terminal block.
10. Turn on the mains supply to the controller.
11. Turn the sensitivity control to midway.
12. Short circuit P2 & G, the relay should be energised.
13. Short circuit P1 & G, the relay should de-energise.
Page 10 of 22
14. Remove the P1 & G short, the relay should remain de-energised.
15. Remove the P2 & G short, the relay should energise.
16. Testing the volt free contacts: Ensure the supply to the volt free contacts has been switched OFF and remove the
wires from the terminal block. Use an approved ohmmeter to measure the contact
resistance.
Check with the Relay de-energised (Led OFF) that theC & NO is greater than 1M Ohm and,
C & NC is less than 1 Ohm.
Check with the Relay energised (Led ON) that theC & NO is less than 1 Ohm and,
C & NC is greater than 1M Ohm
Page 11 of 22
4.3 P7/IS Controller technical specifications
Taken@25°C, specifications subject to alteration.
Supply
Supply voltage 240Vac/110Vac/24Vac ±10% factory set
Note- the 240V unit will operate at 240V +10% but its Intrinsically
safe certification is valid to 250V max (240V+4%).
Installation Cat Overvoltage Cat II
Supply frequency 50/60 Hz
Consumption approx 5 V/A
Electrode
Volts 8.0Vac max (open circuit electrodes)
Current 8mA max (short circuit electrodes)
Sensitivity Standard: - approx 300 Ohms to 20K Ohms,
user adjustable.
Special:-low range to approx 7K Ohm
Switching
response <1s
Operating Temp -20°C to +40°C
Cable Typically 70m.
See drawing 2920 for maximum permitted
Levels for intrinsic safety.
Capacitance max before sensitivity is affected -
30nF @ 20KR, 100nF@500R, ignoring drawing 2920.
Output Relay Volt free contact S.P.C.O rated 240Vac @ 5A max, resistive.
For intrinsically safe model-
Load must not exceed 100VA
Current must not exceed 5amps
Voltage must not exceed 250V
Output Led Red Led “On” when relay energised
Fail-safe High or Low factory set
Enclosure
Material Polycarbonate
Mounting Snap fastener for Din Rail mounting DIN 46 277
Weight 325g
Terminals Captive self-locking screws, accepts up to 4mm2 conductor.
Dimensions 55 x 110 x 75mm W x D x H
Page 12 of 22
5.0 ELECTRODE HOLDERS
1. The equipment has not been assessed as a safety-related device (as referred to by
Directive 94/9/EC Annex II, clause 1.5).
2. Installation of this equipment shall be carried out by suitably trained personnel in
accordance with the applicable code of practice.
3. Repair of this equipment shall only be carried out by the manufacturer or in
accordance with the applicable code of practice.
4. If the equipment is likely to come into contact with aggressive substances, then it is
the responsibility of the user to take suitable precautions that prevent it from being
adversely affected, thus ensuring that the type of protection is not compromised.
“Aggressive substances” e.g. acidic liquids or gases that may attack
metals, or solvents that may affect polymeric
materials.
“Suitable precautions” e.g. regular checks as part of routine inspections
or establishing from the material’s data sheet that
it is resistant to specific chemicals.
The user must ensure the holder and installation is suitable for the application. The details
on the product label will indicate its compliance parameters. If the sign ‘X’ is placed after
the certification number, it indicates that the equipment is subject to special conditions for
safe use as specified in the EC Type Examination Certificate and in this manual.
5.1 CAT 1 Electrode Holders
5.1.1 Type identification
Electrode Holders Type
Type’s HPE5, HPE7, HPE7/P/F, HPE7/P, HPE7/PA, HPE8, HPE8/P, HPE12/P, HPE13A,
HPE13A/P, HPE14/X, HPE22, HPE22/P/Fa, HPE22/P, HPE22/PA
All CAT 1 certified Electrode Holders are identifiable by the following codes.
Prefixed 1G/0 and suffixed IS e.g. 1G/0 HPE8/P/IS
Page 13 of 22
5.1.2 Certification markings
Each Holder has a label affixed to its body that states its certification parameters, these
are shown below.
Type’s, HPE7, HPE7/P/F, HPE7/P,
HPE7/PA, HPE8, HPE8/P, HPE12/P,
HPE13A, HPE13A/P, HPE14/X, HPE22,
HPE22/P/Fa, HPE22/P, HPE22/PA
Type HPE5.
5.1.3 Conditions of use
1. The Electrode Holder Type’s HPE7, HPE7/P/F, HPE7/P, HPE7/PA, HPE8, HPE8/P,
HPE12/P, HPE13A, HPE13A/P, HPE14/X, HPE22, HPE22/P/Fa, HPE22/P,
HPE22/PA for Cat 1 version, (Certificate Sira 03ATEX2159X) may be used in zones
0, 1 and 2 with flammable gases and vapours with apparatus groups IIA, IIB & IIC
and with temperature classes T1, T2, T3 and T4. The ambient temperature
operating range is –20 to +100°C, and should not be used outside this range.
2. The Electrode Holder Type HPE5 Cat 1 version, (Certificate Sira 03ATEX2159X)
may be used in zones 0, 1 and 2 with flammable gases and vapours with apparatus
groups IIA, IIB & IIC and with temperature classes T1, T2, T3, T4, T5 and T6. The
ambient temperature operating range is –20 to +40°C, and should not be used
outside this range.
3. The certification of this equipment relies on the following materials used in its
construction, and the special conditions for safe use are observed, section 5.1.4.
For Types Cat 1 Hawker models 1G/0 HPEXXXX/IS only -
Enclosure: HPE5 – UPVC.
HPE7, HPE13, HPE14/X, HPE22 – Polypropylene.
HPE8 – Phenolic.
HPE12 – Di-Cast Aluminium powder coated cap, Phenolic
body.
Electrodes: Low Carbon 316L S/S, Titanium, Hastelloy C,
Monel, Hastelloy B, Galvanised Mild Steel. All may be bare or
coated PPA/571
Page 14 of 22
5.1.4 Special conditions for safe use
(denoted by an X after the certificate number)
1. The Holder Type 1G/0 HPE5/IS shall not be used with an input current, Ιi, that is in
excess of 100 mA.
2. The equipment cannot be considered capable of withstanding 500 Vrms. a.c.
voltage test to earth (a requirement of clause 6.4.12 of EN 50020:2002). This shall
be taken into account when the equipment is being installed.
3. Holder Types 1G/0 HPEXXXX/IS and 1G/0 HPE5/IS shall not be directly installed
in any process where the plastic holder or plastic electrode coating might be
charged by the rapid flow of a non-conductive medium, including application,
cleaning, maintenance or other.
4. In any equipment installation the cap of the Holder Type 1G/0 HPE12/P and the
electrodes of versions of the holders fitted with titanium electrodes shall be provided
with protection from impact or installed such that impacts cannot occur.
5.2 Installation
Electrodes should preferably be mounted vertically in the vessel. Spacing between the
electrodes and their distance from the side of the vessel is dependent on the likelihood of
bridging due to floating matter and the degree of turbulence. For clean application the
distances can be as low as 5 - 8cm but in the case of raw sewage the recommended
distance is 23cm. Using plastic coated electrodes, which are available from stock, can
eliminate bridging, always bare at least 50mm of the coating and have the reference ‘G’
electrode central.
Wall mounted brackets are available for the electrode holders. Where turbulence is
expected, electrodes of long length should be fitted with steady brackets. Both these are
available from stock.
Care must be taken when mounting to ensure that the electrode holder insulators protrude
through the surrounding material e.g. concrete floors. If only the electrodes protrude they
may find a conductive path through the concrete and not the liquid in the vessel.
It is advisable to clean electrode rods and insulators at periodic intervals.
The electrode holder suitability should be confirmed as being correct for the hazardous
location, and must carry the specific certification.
The electrode conductors are electrically isolated from earth. Using a separate ‘G’ probe
as the common probe, and not the vessel or any part of its structure will provide the best
operational performance, and will comply fully with the system certification.
Termination consists of crimp/solder terminals, washers and nut or screw, this may be by
collar or direct to the electrode, depending upon holder type. All connecting hardware is
provided with the holder. The user should ensure a sound connection, which does not
interfere, contact or stress any other connection if present. Adequate clearance must be
Page 15 of 22
maintained between the terminals if using multiholders to prevent them from touching one
plain washer
plain washer
another. The collar is placed over the electrode and fixed using the Allen key provided; the
terminating cable is then attached, or a screw is used for direct connection.
electrode
solder/crimp
terminal
nut
lock washer
7. CABLE SELECTION
Allen key
fixing
Collar
arrangement
solder/crimp
terminal
Screw arrangement
screw
lock washer
electrode
6.0 CABLE PROPERTIES
All cables have an inherent capacitance and inductance, these values must be limited to
allow only small energy levels going into the hazardous area. The total allowable
capacitance and inductance should be strictly adhered to so as not to infringe the
certification, this is shown on drawing 2920, see also section on “system”.
The capacitance and inductance values stated are for the total amount of cable of all the
systems in any one sump, tank or vessel. The capacitance being that of P1 and P2
conductors measured to the cable screen or armouring. The inductance is the sum of all
conductors used for P1, P2 and G connections. Examples of calculating cable
capacitance and inductance follow.
6.1 Cable inductance
Example of calculating cable inductance
Method A. As the L/R Ratio remains constant regardless of cable length, this is the
easiest method. For example, it will be seen referring to Table 1 that for 1.5mm2 steel wire
armoured cable the L/R ratio is 28µH/Ω and looking at drawing 2920 tables this meets the
requirements for all gas groups for up to 6 systems and groups 11A and 11B for up to 10
systems .
Method B. Assuming two controllers are being used for pump control using both P1 and
P2, and two controllers for High and Low level alarms using the P1 connections and one
earth electrode (G), thus 7 cables in all.
The maximum inductance permitted from drawing 2920 table for Group 11C for 6 systems
is 0.78mH. Reference Table 1, a 2.5mm2 steel wire armoured cable having an inductance
of 0.32mH per 1000m so –
The total cable length permitted is (0.78 / 0.32) x 1000 = 2437m, or
2437 / 7 = 348m per electrode circuit.
Page 16 of 22
6.2 Cable capacitance
Example of calculating cable capacitance
Normally it is the cable capacitance that will limit the length of the conductors.
Using the same scenario as above 4 x P1 and 2 x P2, for capacitance we ignore the ‘G’ so
are concerned with 6 cables.
The maximum capacitance permitted from drawing 2920 table for Group 11C for 6
systems is 0.143µF. From Table 1, a 2.5mm2 Steel wire armoured cable having a
capacitance of 0.43µF per 1000m so –
The total cable length permitted is (0.143 / 0.43) x 1000 = 332m, or
332 / 6 = 55m per electrode circuit.
Similarly for two core 1.5mm2 cable we have: (0.143 / 0.39) x 1000 = 366m, or 366 / 6 = 61m per electrode circuit.
6.3 Electrode capacitance
The electrodes will also contribute to the overall capacitance of the system by a tiny
amount, which is normally negligible; allowing up to 200pF between any two electrodes will
present no problem in normal practice. For example heavy-duty electrodes such as the
HPE8 when mounted 230mm apart may be up to 18m in length before this figure is
exceeded. Light duty electrodes such as the HPE7, mounted 75mm apart may be up to
15m in length, which is far beyond normal requirements.
6.4 Cable selection guide
There are many different types of commercially available cables all with different
specifications. If the cable length is restricted using S.W.A cable it is possible to use
instrument cable since these generally have a lower capacitance. A selection has been
given in this document for reference purposes, table 1, the user should check with the
manufacturers data that the cable is suitable, see also system section “Permissible
interconnecting cables”.
For functionality it is important not to exceed the units operational capacitance input as it
will affect its sensitivity, these can be found in the controllers technical specifications. The
overall system capacitance/inductance can either be calculated or directly measured using
a calibrated capacitance/inductance meter, which is preferable. This can be used to
confirm the total maximum table values in drawing 2920 have not been exceeded.
Page 17 of 22
Table 1. PARAMETERS OF SOME COMMERCIALLY AVAILABLE CABLES.
A “System” is defined when the P7/IS controller is
sed in conjunction with approved Hawker
electrode holders and installed in line with the
information in this section. A system certificate of
conformity Sira Ex 03E2161 applies. See also
drawing 2920 and Section 3 ‘General description
A “System” label is supplied with this manual or
on request. This label must be positioned within
a strategic position within the installation and in
This table shows some parameters of 600/1000V-armoured cable to BS6346. P.V.C.
insulated. P.V.C. Inner sheathed steel wire armoured and P.V.C. Oversheathed.
Two Core Three Core
Nominal area of
Conductor, mm2 1.5 2.5 4.0 1.5 2.5 4.0
Inductance per
Core per 1000m 0.33 0.32 0.31 0.33 0.32 0.31
Cable, mH
Max.Capacitance per
1000m between one
conductor and the other 0.39 0.43 0.51
conductor and armour
earthed at 50Hz, µF
Max. equivalent star
Capacitance per 1000m 0.46 0.51 0.61
of cable, µF
Nominal L/R Ratio 28 45 70 28 45 70
µH/Ohm
7.0 SYSTEM INFORMATION
u
and installation’.
an environment it will not be harmed.
7.1 Equipment located in a non-hazardous (safe) area
i Equipment which is unspecified except that it must not be supplied from, nor
contain, under normal or abnormal conditions, a source of potential with respect
to earth (ground) in excess of 250V a.c. r.m.s. or 250V d.c.and
ii Controllers Type P7/IS – Certificate number Sira 03ATEX2160X.
7.2 Equipment located in a hazardous area
i Holders Types 1G/0 HPE5/IS or 1G/0 HPE XXXX/IS – Certificate number Sira
03ATEX2159X (Zone 0 applications).
7.3 Configuration
Page 18 of 22
Up to ten controllers may be used within a system with up to three holders per
controller connected i.e. one holder to each of the controller terminals ‘G’, ‘P1’ and
‘P2’. Multiple controller systems may employ a common ‘G’ holder with the
controllers connected together via links between the controller ‘G’ terminals.
Where a multiple controller system uses a Holder Type 1G/0 HPE5/IS as a common
‘G’ holder the maximum number of ‘P1’ / ‘P2’ holders that may be fitted is five.
7.4 Permissible interconnecting cables
For multiple controller systems where cable cores associated with the outputs of
different controllers are contained within the same cable then such cables must be
either:
Type A in accordance with clause 5.3.1 of EN 50 039:1980
or
ii. Type B in accordance with clause 5.3.2 of EN 50 039:1980
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According to the
EC Directive 94/9/EC of 23 March 1994 (ATEX 100a)
Type of equipment: Conductivity Level Controller
Type model: P7/I.S
Certificate Number: SIRA03ATEX2160X
Type of equipment: Conductivity Electrode Holder Cat 1.
Type model: 1G/0 HPE5/IS, 1G/0 HPE7/IS, 1G/0 HPE7/P/F/IS, 1G/0 HPE7/P/IS,
1G/0 HPE7/PA/IS, 1G/0 HPE8/IS, 1G/0 HPE8/P/IS, 1G/0 HPE12/P/IS,
1G/0 HPE13A/IS, 1G/0 HPE13A/P/IS, 1G/0 HPE14/X/IS, 1G/0 HPE22/IS,
1G/0 HPE22/P/Fa/IS, 1G/0 HPE22/P/IS, 1G/0 HPE22/PA/IS
Certificate Number: SIRA03ATEX2159X
Type of equipment: P7/I.S Conductivity Level System
Type model: P7/I.S Controller used with Approved Electrode Holders
Certificate Number: Ex03E2161
Manufacturer: Hawker Electronics Ltd
Manufacturers Address: 57 The Avenue, Rubery Industrial Estate, Rubery, Birmingham, B45 9AL. U.K.
Notified Body: Sira Certification Service (0518)
Rake Lane
Eccleston
Chester
CH4 9JN
Conformity has been demonstrated with reference to the following documentation:
EC type-examination certificate Sira 03ATEX2160X, dated 27/07/10
EC type-examination certificate Sira 03ATEX2159X, dated 14/08/03, Issue 05/08/05
EC type-examination certificate Sira Ex 03E2161 SYST, dated 30/06/03
Compliance with the essential Health & Safety Requirements has been assessed by reference to the following standards,
see individual certificates for specific listings.
EN 50014:1997 +A1 & A2, EN 50020:2002, EN 60079-11:2007, EN 50284:1999, EN 50039:1980
Indicate below compliance
X
X
The product complies with parts of the European safety standards / other safety standards /
technical specifications listed above.
Hawker Electronics Ltd has an internal production control system that ensures compliance
between the manufactured products and the technical documentation.
29-07-10
Signed…… ………………………………………….. Date……………………….
Mark Armstrong
Technical Director
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Thank you for reading this data sheet.
Please contact us for a quotation:
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