GNExCP6C-PT

Manual Call Point – Tool Reset

With Resistor Modules

For use in Flammable Gas and

Combustible Dust Atmospheres.

1) Introduction

The GNExCP6C-PT is a tool reset button manual call point which is certified to the European and

International Gas and Dust standards. The unit meets the requirements of the ATEX directive

2014/34/EU and IECEx scheme.

The call point can be used in hazardous areas where potentially flammable gas and dust atmospheres may be present.

All units have up to two of the following:





Monitoring resistors up to 1.5W per module

Monitoring diode

 Monitoring Zener diode

Units may also incorporate an LED indicator in addition to the two series and/ or EOL devices allowed.

The units are Group II, EPL (equipment protection level) Gb. The equipment is certified ‘Ex db eb mb

IIC T4 Gb’ and as such may be used in Zones 1 and 2 with flammable gases and vapours with gas groups IIA, IIB & IIC and temperature classes T1,

T2, T3 and T4.

These units are also Group III, EPL Db. The equipment is certified ‘Ex tb IIIC T75ºC Db’ and as such may be used in Zones 21 and 22 for combustible dusts groups IIIA, IIIB & IIIC.

2) Ratings & Markings

All units have a rating label, which carries the following important information: -

Unit Type No.:

GNExCP6C-PT Manual Call Point

Input Voltages:

Important: See section 7.1 for current ratings

125VDC Max 0.5A Max. Resistive Load;

0.03A Max Inductive Load

75VDC Max 0.75A Max

48VDC Max 1.0A Max

24VDC Max 5.0A Max Resistive Load;

3.0A Max Inductive Load

12VDC Max 5.0A Max

6VDC Max 5.0A Max

Code:

GNExCP6C-PT

Ex db eb mb IIC T4 Gb

Ex tb IIIC T75ºC Db

IP66

–40ºC <= Ta <= +65ºC

Certificate No.:

SIRA 09ATEX3286X

IECEx SIR 09.0121X

Epsilon x: II 2GD

CE Marking

Notified body No. 2813

Year/Serial No. i.e. 20/1CP6CPT000001

WARNING - DO NOT OPEN WHEN AN

EXPLOSIVE ATMOSPHERE MAY BE PRESENT,

ELECTROSTATIC HAZARD – CLEAN ONLY

WITH A DAMP CLOTH

European Safety Systems Ltd.

Impress House, Mansell Road, Acton, London W3 7QH

Document D154-00-255-IS Issue 1 26-08-2020

INSTRUCTION MANUAL

GNExCP6C-PT Tool Reset Manual Call Point

For use in Flammable Gas and Dust Atmospheres

3) Type Approval Standards

The call point has an EC Type examination certificate issued by SIRA and have been approved to the following standards: -

EN60079-0:2018 / IEC60079-0:2017

EN60079-1:2014 / IEC60079-1:2014

EN60079-7:2015 / IEC60079-7:2017

EN60079-18:2015 / IEC60079-18:2014

EN60079-31:2014 / IEC60079-31:2013

The equipment is certified for use in ambient temperatures in the range:

GNExCP6C-PT -40 o C to +65 o C and shall not be used outside this range.

4) Installation Requirements

Installation of this equipment shall only be carried out by suitably trained personnel in accordance with the applicable code of practice e.g.

IEC 60079-14/EN 60079-14

Repair of this equipment shall only be carried out by the manufacturer or in accordance with the applicable code of practice e.g. IEC 60079-19/EN

60079-19.

Refer to certificates SIRA 09ATEX3286X and

IECEx SIR 09.0121X for special conditions of safe use.

The certification of this equipment relies on the following materials used in its construction:

Enclosure: GRP - Glass Reinforced Polyester

Through enclosure mechanism: Plastic Nylon Zytel

Injection Moulded

Sealing of enclosure and mechanism: O-ring

Acrylonitrile-Butadiene Rubber

Potting Compound of resistors where used: Epoxy

Resin

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, gases or solvents that may affect polymeric materials.

Sheet 1 of 3

“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.

Under extreme conditions the unit may generate an ignition-capable level of electrostatic charges. The unit must not be installed in a location where it may be subjected to external conditions (such as highpressure steam) which may cause a build-up of electrostatic charges on non-conducting surfaces.

Cleaning of the unit must only be carried out with a damp cloth.

5) Call Point Location and Mounting

The location of the call point should enable ease of access for operation and testing. The unit should be mounted using the 4 off fixing holes which will accept up to M5 sized fixings.

View of base unit showing fixing centres (in mm).

To gain access to the mounting holes in the base the front cover must be removed.

This is achieved by removing the 4 off M4 cap head bolts holding on the cover. [email protected] Tel: +44 (0)208 743 8880 www.e2s.com Fax +44 (0)208 740 4200

Once the screws are removed the cover will hang down out of the way to gain access to the Ex e terminal block, the internal earth terminal and mounting hole recesses.

6) Earthing

The unit has an internal earth terminal.

It is recommended that a cable crimp lug is used on the earth wires.

The internal earth wire is placed under an earth clamp which will stop the cable twisting. This is secured by an M4 screw and spring washer.

7) Cable connections

There are 3 off cable entries for M20x1.5 Ex e approved cable glands or stopping plugs with a minimum ingress protection of IP66

The unit can be wired in a number of different ways depending on the device combination selected.

EOL (End of line) device: resistor – ExxxR / diode – ED1 / zener – ExxxZ

Series (In line) device: resistor – SxxxR / diode – SD1 / zener – SxxxZ /

LED

Microswitch 1 = M/S 1

Microswitch 2 = M/S 2

The unit can be wired with a maximum of 2 module devices – refer to wiring schematic D154-06-051

When wiring to Increased Safety terminal enclosures, you are only permitted to connect one wire into each way on the terminal block unless a pair of wires are crimped into a suitable ferrule. For the six-way terminal block wire sizes allowable are

0.5mm² to 4.0mm². For the 8-way DIN rail wire sizes allowable are 0.5mm² to 2.5mm²

Leads connected to the terminals shall be insulated for the appropriate voltage and this insulation shall extend to within 1mm of the metal of the terminal throat. They shall only be installed and wired with cable in an ambient temperature of -10°C to +80°C

All terminal screws, used or unused, shall be tightened down to between 0.5 Nm and 0.7 Nm.

Voltage  option 

Max 

Voltage  

Min resistor value  allowable in module 

Type C unit (1.5W) 

6 V dc

12V dc

6 V dc

12 V dc

27 ohms

110 ohms

24V dc 24 V dc 430 ohms

Internal Earth terminal

Ex e terminal block

Note: Depending on options chosen an 8-Way DIN

Rail or 6-Way terminal block may be selected.

48V dc 48 V dc 1K8 ohms

Table 1

European Safety Systems Ltd.

Impress House, Mansell Road, Acton, London W3 7QH

Document D154-00-255-IS Issue 1 26-08-2020

7.1) Current Limitations

The maximum allowable current is determined as the smallest value from the following scenarios:

1. When both module resistor values are the same as or above the minimum range of values shown in table 1, the current is not further limited.

However, when either resistor value is lower than those shown in table 1, the current must be limited to the values given in table 2.

Voltage  option 

6 V dc

Max 

Voltage  

6 V dc 

Max current when  resistor values lower  than minimum

250mA

12V dc

24V dc

12 V dc 

24 V dc 

125mA

62mA

48V dc 48 V dc  31mA

Table 2

For example, if a 24V DC unit is fitted with a series resistor of 270 ohms, the maximum current of the unit would be reduced to 62mA since the resistance is less than the minimum

430 ohms allowable at this voltage.

E2S recommends a minimum resistor value of 100 ohms for a Series device and 180 ohms for an EOL device fitted to a 24V unit.

2. If a diode module is pre-fitted as either an

EOL or Series Device, the following current limitation applies:

Unit Voltage

48V DC

6, 12 & 24V DC

Max. Diode Current

0.75A

2.0A

3. If a Zener diode module is pre-fitted as either

EOL or Series device, the following current limitation applies:

Zener

Voltage

3.3V

4.7V

5.1V

5.6V

6.2V

6.8V

10V

Max. Input

Voltage

56V DC

Max. Current

230mA

162mA

149mA

136mA

122mA

112mA

76mA

12V 63mA

Sheet 2 of 3

4. Units with LED code ‘C’

GNExCP6C-PTXXXXXXXXX

C

-XX-ExxxR-SxxxR

Maximum current is reduced to 20mA.

In this case, the current-limiting resistor for the

LED is not present, so that to safely power the LED the maximum current must be limited.

For units with LED code ‘L’, the current is limited by the LED current-limiting resistor.

See value of this resistor in table below.

GNExCP6C-PTXXXXXXXXX

L

-XX-ExxxR-SxxxR

LED Resistor

3K3 (3300 ohms)

Max. Input Voltage

56V DC

1K5 (1500 ohms) 28V DC

8) Testing unit operation

The tool reset button unit can be tested without the need to replace any element.

To test, lift the cover lift flap to reveal the tool reset button. The button should be pressed into the body to activate the unit and place it into the operated condition.

The call point switch will now change over its contacts to operate the alarm.

Once testing is complete the unit needs to be reset from the operated condition. [email protected] Tel: +44 (0)208 743 8880 www.e2s.com Fax +44 (0)208 740 4200

Using the special reset tool provided, rotate the tool reset button anticlockwise by an angle of 55°, see guide alignment marks on the button and cover, shown below (1). The tool reset button should pop back up to its original position.

Ensure that the tool reset button has also twisted back clockwise by 55° to its original position see guide marks on button and cover, shown below (2).

The unit is now reset.

1. On operated unit 2. Button should pop twist tool reset button up and twist back to anticlockwise 55° original position with special key to reset

Note: use alignment marks circled to indicate the tool reset buttons status/position

Unit currently shown as ‘standby condition’

Resetting an operated unit is the same as resetting a tested unit.

Proof Test Interval 

9) SIL 2 Reliability Data

Reliability and Functional safety IEC/EN61508 which has been assessed and is considered suitable for use in low demand safety function:

• Random Hardware Failures and Systematic

Failures (route 2H)

• As an unvoted item (i.e. hardware fault tolerance

of 0) at SIL 2

The product was assessed against failure modes:

• Failure to close a contact when the call point is

struck with specified force

• Failure to open a contact when the call point is

struck with specified force

• Spurious output despite no input

Integrity in respect of failure to close 

Total Failure rate

“hazardous” failure rate (revealed)

“hazardous” failure rate (unrevealed)

“safe” failure rate (revealed)

“safe” failure rate (unrevealed)

Diagnostic Coverage

System type

Hardware Fault Tolerance 

Safe Failure Fraction

PFD (hazardous failure)

European Safety Systems Ltd.

Impress House, Mansell Road, Acton, London W3 7QH

Document D154-00-255-IS Issue 1 26-08-2020

SIL 2 

0.133 pmh

0 pmh

0.1 pmh

0.033 pmh

0

99%

A

0 

>99%

1.25 x 10 ‐3

Up to 1 year 

Sheet 3 of 3 [email protected] Tel: +44 (0)208 743 8880 www.e2s.com Fax +44 (0)208 740 4200