Michell Instruments Easidew PRO Manuale utente

Intrinsically Safe Field Display

User’s Manual

97321 Issue 2.3

May 2016

ppmV

Easidew PRO I.S. Field Display

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I.S. Field Display

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www.michell.com

I.S. Field Display User’s Manual

iv 97321 Issue 2.3, May 2016

1 INTRODUCTION ................................................................................................1

1.1 Operation ......................................................................................................... 1

1.1.1 Controls ....................................................................................................... 2

2 INSTALLATION ..................................................................................................3

2.1 4-20 mA Input ................................................................................................. 3

2.2 System Design for Gas Hazardous Areas............................................................. 4

2.2.1 Transmitter Loops ......................................................................................... 4

2.2.2 Remote Indication......................................................................................... 5

2.3 Location ........................................................................................................... 6

2.4 Installation Procedure ....................................................................................... 6

2.5 EMC ................................................................................................................ 7

3 OPERATION ......................................................................................................8

3.1 Conﬁguration And Calibration............................................................................. 8

3.1.1 Summary of Conﬁguration Functions .............................................................. 9

3.1.2 Indicator Function: ‘FunC’........................................................................... 11

3.1.2.1 ‘Std’ Linear (Default)............................................................................ 12

3.1.3 Resolution: 'rESn'....................................................................................... 12

3.1.4 Position of the Decimal Point: ‘dP’............................................................... 12

3.1.5 Re-Range Display or Calibrate Using an External Current Source: ‘CAL’.......... 13

3.1.6 Re-Range Display or Calibrate Using Internal Reference: ‘SEt’ ....................... 14

3.1.7 Function of the P Push-Button: ‘C - - P’ ........................................................ 14

3.1.8 Tare Function: ‘tArE’ .................................................................................. 15

3.1.9 Security Code: ‘CodE’................................................................................. 15

3.1.10 Reset to Factory Defaults: ‘rSEt’ .................................................................. 15

3.1.11 Under and Over-Range................................................................................ 16

3.2 External Keypad (Optional) .............................................................................. 16

3.3 Alarms (Optional)............................................................................................ 17

3.3.1 Solid State Output ...................................................................................... 18

3.3.2 Intrinsic Safety............................................................................................ 18

3.3.3 Conﬁguration and Adjustment...................................................................... 19

3.3.4 Alarm Enable: ‘EnbL’.................................................................................. 20

3.3.5 Setpoint Adjustment: ‘SP1’ and ‘SP2’........................................................... 20

3.3.6 Alarm Function: ‘Hi.Lo’............................................................................... 21

3.3.7 Alarm Output Status: ‘no.nC’ ...................................................................... 21

3.3.8 Hysteresis: 'HStr' ....................................................................................... 21

3.3.9 Alarm Delay: 'dELA' ................................................................................... 22

3.3.10 Alarm Silence Time: 'SiL' ............................................................................ 22

3.3.11 Flash Display when Alarm Occurs: ‘FLSH’..................................................... 23

3.3.12 Access Setpoint in Display Mode: 'ACSP'...................................................... 23

3.3.13 Adjusting Alarm Setpoints from the Display Mode.......................................... 24

3.4 Display Backlight (Optional)............................................................................. 25

3.4.1 Loop Powering the Backlight ........................................................................ 25

3.4.2 Separately Powering the Backlight................................................................ 26

3.5 Pipe-Mounting Kits .......................................................................................... 27

Contents

Safety ................................................................................................................................vi

Toxic Materials .............................................................................................................vi

Repair and Maintenance ...............................................................................................vi

Safety Conformity ........................................................................................................vi

Abbreviations......................................................................................................................vi

Warnings ............................................................................................................................vi

I.S. Field Display User’s Manual

Michell Instruments v

4 MAINTENANCE ................................................................................................28

4.1 Fault Finding During Commissioning ................................................................. 28

4.2 Fault Finding After Commissioning.................................................................... 28

4.3 Servicing ........................................................................................................ 28

4.4 Routine Maintenance....................................................................................... 28

Figures

Figure 1 Indicator Block Diagram..............................................................................2

Figure 2 Loop-Powered by a Galvanic Isolator (Easidew PRO I.S.)...............................4

Figure 3 Loop-Powered by a Galvanic Isolator (Easidew TX I.S.) .................................4

Figure 4 Alternative Circuits for Remote Indication in a Hazardous Area ......................5

Figure 5 Installation Procedure.................................................................................6

Figure 6 Dimensions & Terminal Connections.............................................................7

Figure 7 Conﬁguration Menu ..................................................................................10

Figure 8 Alarm Outputs..........................................................................................17

Figure 9 Equivalent Circuit of Each Alarm Output .....................................................18

Figure 10 Typical Alarm Application ..........................................................................18

Figure 11 Alarm Conﬁguration Functions in Conﬁguration Menu..................................19

Figure 12 Terminals for Optional Backlight ................................................................25

Figure 13 Loop-Powered Backlight............................................................................25

Figure 14 Separately Powered Backlight....................................................................26

Figure 15 Pipe-Mounting Kit .....................................................................................27

Appendices

Appendix A Hazardous Area Certiﬁcation ...................................................................... 30

A.1 ATEX Certiﬁcation ........................................................................ 30

A.2 Product Standards ....................................................................... 30

A.3 Product Certiﬁcation .................................................................... 30

A.4 Global Certiﬁcates/Approvals ........................................................ 31

A.5 Input Terminal Parameters ........................................................... 31

A.6 Special Conditions........................................................................ 31

A.7 Non- Incendive............................................................................ 31

A.8 Maintenance and Installation........................................................ 31

Appendix B EC Declaration of Conformity...................................................................... 43

Appendix C Quality, Recycling & Warranty Information................................................... 45

C.1 Pressure Equipment Directive (PED) 97/23/EC ............................... 45

C.2 Recycling Policy .......................................................................... 45

C.3 WEEE Compliance........................................................................ 45

C.4 RoHS2 Compliance ...................................................................... 46

C.5 Warranty..................................................................................... 46

C.6 REACH Compliance ...................................................................... 47

C.7 Calibration Facilities ..................................................................... 47

C.8 Return Policy ............................................................................... 48

C.9 Manufacturing Quality .................................................................. 48

Appendix D Return Document & Decontamination Declaration........................................ 50

I.S. Field Display User’s Manual

vi 97321 Issue 2.3, May 2016

Safety

The manufacturer has designed this equipment to be safe when operated using the procedures

detailed in this manual. The user must not use this equipment for any other purpose than that

stated. Do not apply values greater than the maximum value stated.

This manual contains operating and safety instructions, which must be followed to ensure the safe

operation and to maintain the equipment in a safe condition. The safety instructions are either

warnings or cautions issued to protect the user and the equipment from injury or damage. Use

qualiﬁed personnel and good engineering practice for all procedures in this manual.

Toxic Materials

The use of hazardous materials in the construction of this instrument has been minimized. During

normal operation it is not possible for the user to come into contact with any hazardous substance

which might be employed in the construction of the instrument. Care should, however, be exercised

during maintenance and the disposal of certain parts.

Repair and Maintenance

The instrument must be maintained either by the manufacturer or an accredited service agent. Refer

to www.michell.com for details of Michell Instruments’ worldwide ofﬁces contact information.

Safety Conformity

This product meets the essential protection requirements of the relevant EU directives. Further

details of applied standards may be found in the product speciﬁcation.

Abbreviations

The following abbreviations are used in this manual:

AC alternating current

°C degrees Celsius

dp dew point

mA milliampere

max maximum

V Volts

Warnings

The following general warnings listed below are applicable to this instrument. They are

repeated in the text in the appropriate locations.

Where this hazard warning symbol appears in the following

sections, it is used to indicate areas where potentially

hazardous operations need to be carried out.

I.S. Field Display User’s Manual

Michell Instruments 1

INTRODUCTION

1 INTRODUCTION

This ﬁeld mounting, intrinsically safe digital indicator displays the current ﬂowing in a

4-20 mA loop in engineering units. It is loop-powered but only introduces a 1.2 V drop,

which allows it to be installed into almost any 4-20 mA current loop. No additional

power supply or battery is required.

The size of the display is 4 digits, 34mm high.

This instruction manual supplements the instruction sheet supplied with the instrument.

The main application of this instrument is to display a measured variable or control

signal in a hazardous process area. The zero and span of the display are independently

adjustable so that the I.S. Field Display can be calibrated to display any variable

represented by the 4-20 mA current, e.g. dew point, ppmVor ppmW. NOTE: The

instrument will only display the unit selected at order - dp, ppmVor ppmW.

The I.S. Field Display been certiﬁed intrinsically safe for use in gas and dust hazardous

areas by Notiﬁed Body Intertek Testing and Certiﬁcation Ltd and complies with the

European ATEX Directive 94/9/EC and also in accordance with the IECEx Scheme. Dust

certiﬁcation is an option which must be requested when the instrument is

ordered.

The EC-Type Examination certiﬁcate speciﬁes that, under fault conditions, the output

voltage, current and power at the 4-20 mA input terminals will not exceed those speciﬁed

for simple apparatus in Clause 5.7 of EN 60079-11, which simpliﬁes installation and

documentation.

For installations in the USA and Canada the I.S. Field Display complies with FM and cFM

certiﬁcation. FM and cFM certiﬁcation is an option which must be requested

when the instrument is ordered.

1.1 Operation

Figure 1

shows a simpliﬁed block diagram of the I.S. Field Display. The 4-20 mA input

current ﬂows through resistor R1 and forward biased diode D1. The voltage developed

across D1, which is relatively constant, is multiplied by a switch mode power supply and

used to power the instrument. The voltage developed across R1, which is proportional to

the 4-20 mA input current, provides the input signal for the analog to digital converter.

Each time a 4-20 mA current is applied to the instrument, initialization is performed

during which all segments of the display are activated. After ﬁve seconds the instrument

displays the input current using the calibration information stored in the instrument

memory. If the loop current is too low to power the instrument it will display the error

message LPLo.

I.S. Field Display User’s Manual

297321 Issue 2.3, May 2016

INTRODUCTION

4-20 mA

input

Less than

1.2 V

D1 Power

Supply

Analog

to digital

converter

88888

Optional

Backlight

Optional

Alarms

alarm 1

alarm 2

Common

Loop powered

Separately

powered

Figure 1

Indicator Block Diagram

1.1.1 Controls

The I.S. Field Display is controlled and calibrated via four push-button switches located

behind the instrument control cover, or as an option on the control cover. In the display

mode, i.e. when the instrument is displaying a process variable, these buttons have the

following functions:

PWhen this button is pushed the instrument will display the input

current in mA or as a percentage of the instrument span, depending

upon how the I.S. Field Display has been conditioned. When the

button is released the normal display in engineering units will return.

The function of this push-button is modiﬁed when optional alarms are

ﬁtted to the I.S. Field Display.

When this button is pushed the instrument will display the numerical

value the I.S. Field Display has been calibrated to display with a 4

mA input. When released the normal display in engineering units will

return.

When this button is pushed the instrument will display the numerical

value the I.S. Field Display has been calibrated to display with a 20

mA input. When released the normal display in engineering units will

return.

ENo function in the display mode unless the tare function is being used.

P+ Indicator displays ﬁrmware number followed by version.

P+ Provides direct access to the alarm setpoints when optional alarms are

ﬁtted to the I.S. Field Display and when the ACSP access setpoints in

display mode function has been enabled.

P+ EProvides access to the Conﬁguration Menu via optional security code.

I.S. Field Display User’s Manual

Michell Instruments 3

INSTALLATION

2 INSTALLATION

2.1 4-20 mA Input

The input safety parameters for the two 4-20 mA input terminals 1 & 3 are:

Ui = 30 V DC

li = 200 mA

Pi = 0.84 W

The maximum equivalent capacitance and inductance between the two 4-20 mA input

terminals 1 & 3 is:

Ci = 13nF

Li = 16μH

The maximum permitted loop cable parameters can be calculated by adding these

ﬁgures to Ci and Li of other instruments in the loop and subtracting the totals from the

maximum cable capacitance Co and cable inductance Lo permitted for the Zener barrier

or galvanic isolator powering the loop.

Although the I.S. Field Display does not itself comply with the requirements for

simple apparatus, the EC-Type Examination Certiﬁcate states that for intrinsic safety

considerations, under fault conditions, the output voltage, current and power at

terminals 1 & 3 will not exceed those speciﬁed by clause 5.7 of EN 60079-11 for simple

apparatus. This simpliﬁes the application and documentation of intrinsically safe loops

containing the I.S. Field Display.

I.S. Field Display User’s Manual

497321 Issue 2.3, May 2016

INSTALLATION

2.2 System Design for Gas Hazardous Areas

2.2.1 Transmitter Loops

The I.S. Field Display may be connected in series with almost any intrinsically safe 4-20

mA current loop and calibrated to display the measured variable or control signal in

engineering units. There are two basic design requirements:

1. The intrinsic safety output parameters of the 4-20 mA loop, which are

deﬁned by the Zener barrier or galvanic isolator powering the loop, must

be equal to or less than:

Uo = 30 V DC

lo = 200 mA

Po = 0.84 W

2. The loop must be able to tolerate the additional 1.2 V required to operate

the I.S. Field Display. When ﬁtted with an optional backlight this increases

to 5 V if the backlight is loop-powered. See Section 3.4.1.

Figures 2 and 3

illustrate typical applications in which an I.S. Field Display is connected

with an Easidew PRO I.S. and an Easidew TX I.S. transmitter powered by a galvanic

isolator.

Hazardous Area Safe Area

28 V, 93 mA

Galvanic Isolator

4-20 mA

Power Supply

4-20 mA

ppm V

Easidew PRO I.S. Field Display

3 4 6 5 2 1

Figure 2

Loop-Powered by a Galvanic Isolator (Easidew PRO I.S.)

Hazardous Area Safe Area

4-20 mA

Power Supply

4-20 mA

ppm V

Easidew PRO I.S. Field Display

3 4 6 5 2 1

Pin 3

Pin 1

28 V, 93 mA

Galvanic Isolator

Figure 3

Loop-Powered by a Galvanic Isolator (Easidew TX I.S.)

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