Vaisala HMT370EX - Wiring with Zener Barriers; Figure 38 Wiring Diagram with Zener Barriers

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5.4.2 Wiring with Zener barriers

Test Points

HAZARDOUS AREA SAFE AREA

4 ... 20

Intrinsically

safe certiﬁed

Zener barriers

Controller

DC power supply

If the controller

uses voltage input,

use a shunt resistor:

4 ... 20 mA

Controller

U = I*RI

4 ... 20

External

grounding

terminal

Figure 38 Wiring diagram with Zener barriers

Chapter 5 – Installation

Main Page

Table of Contents3
About this Document11
Version Information11
Related Manuals11
Table 2 Related Manuals11
Documentation Conventions12
Trademarks12
Product Overview13
Introduction to HMT370EX Series13
Basic Features and Options13
Hazardous Area Safety13
Available Measurement Parameters14
Table 3 Available Measurement Parameters for HMP37114
Table 4 Available Measurement Parameters for HMP378F and HMP378H14
Display Options16
LED States in Transmitter with no Display16
Figure HMT370EX Transmitter Display Options16
Connectivity to Vaisala Insight Software17
Table 5 LED Status Indicator States17
Transmitter Parts18
Figure 2 HMT370EX Transmitter External Parts18
Cable Gland and Conduit Options19
Figure 3 HMT370EX Transmitter Internal Parts19
Figure 4 Default Plugs in HMT370EX Lead-Throughs20
Table 6 Cable Lead-Through Accessories20
HMT370EX Regional Safety Certification Information21
Regional Safety Certification Overview21
Table 7 HMT370EX Series Regional Ex Classifications21
Atex/Iecex Safety Certification Information22
Using HMT370EX Series Transmitters in Hazardous Locations22
Table 8 HMT370EX Series Hazardous Area Classifications23
Guidelines for Safe Use in Hazardous Conditions24
Figure 5 HMT370EX Parts Overview24
Table 9 Allowed Ambient Temperature Ranges25
Table 10 Intrinsically Safe Input Parameters26
Figure 6 Location of Test Points and Service Port27
Japan Safety Certification Information28
Using HMT370EX Series Transmitters in Hazardous Locations28
Table 11 HMT370EX Series Hazardous Area Classifications29
Guidelines for Safe Use in Hazardous Conditions30
Figure 7 HMT370EX Parts Overview30
Table 12 Allowed Ambient Temperature Ranges31
Table 13 Intrinsically Safe Input Parameters32
Figure 8 Location of Test Points and Service Port33
China Safety Certification Information34
Using HMT370EX Series Transmitters in Hazardous Locations34
Table 14 HMT370EX Series Hazardous Area Classifications35
Guidelines for Safe Use in Hazardous Conditions36
Figure 9 HMT370EX Parts Overview36
Table 15 Allowed Ambient Temperature Ranges36
Table 16 Intrinsically Safe Input Parameters38
Figure 10 Location of Test Points and Service Port39
Korea Safety Certification Information40
Using HMT370EX Series Transmitters in Hazardous Locations40
Table 17 HMT370EX Series Hazardous Area Classifications41
Guidelines for Safe Use in Hazardous Conditions42
Figure 11 HMT370EX Parts Overview42
Table 18 Allowed Ambient Temperature Ranges42
Figure 12 Location of Test Points and Service Port44
Table 19 Intrinsically Safe Input Parameters44
FM) Safety Certification Information45
Using HMT370EX Series Transmitters in Hazardous Locations45
Table 20 HMT370EX Series Hazardous Area Classifications46
Guidelines for Safe Use in Hazardous Conditions47
Figure 13 HMT370EX Parts Overview47
Table 21 Allowed Ambient Temperature Ranges48
Table 22 Intrinsically Safe Input Parameters49
Figure 14 Location of Test Points and Service Port50
Figure 15 FM Approved Wiring Diagram for Intrinsically Safe Operation51
CAN (MET) Safety Certification Information52
Using HMT370EX Series Transmitters in Hazardous Locations52
Table 23 HMT370EX Series Hazardous Area Classifications53
Guidelines for Safe Use in Hazardous Conditions54
Figure 16 HMT370EX Parts Overview54
Table 24 Allowed Ambient Temperature Ranges54
Figure 17 Location of Test Points and Service Port56
Table 25 Intrinsically Safe Input Parameters56
UKEX) Safety Certification Information57
Using HMT370EX Series Transmitters in Hazardous Locations57
Table 26 HMT370EX Series Hazardous Area Classifications58
Guidelines for Safe Use in Hazardous Conditions59
Figure 18 HMT370EX Parts Overview59
Table 27 Allowed Ambient Temperature Ranges60
Table 28 Intrinsically Safe Input Parameters61
Figure 19 Location of Test Points and Service Port62
Probe Options63
HMT370EX Probe Options Overview63
Figure 20 HMT370EX Probe Options63
HMT370EX Probe Accessories64
Table64
Table 29 HMT370EX Probe Accessories64
Temperature Only Probe Option (HMP371 and HMP373)65
HMP371 Fixed Probe65
Figure 21 Location of Configuration Code on Product Label65
Figure 22 Dimensions in MM (Inches)65
HMP373 Probe for Confined Spaces66
Figure 23 Dimensions in MM (Inches)66
Table 30 HMP371 for Wall Mounting66
Table 31 HMP373 for Confined Spaces66
HMP374 Probe for High Pressure Applications67
Figure 24 Left: Installation Kit for Duct Mounting. Right: Installation Flange. Aluminum or Stainless Steel67
Figure 25 Dimensions in MM (Inches)68
Table 32 HMP374 for High Pressure68
Attaching HMP374 to Process69
Figure 26 HMP374 Fitting Body and Clasp Nut69
HMP375 Probe for High Temperature Applications71
Figure 27 HMP375 Probe and Stainless Steel Installation Flange71
Table 33 HMP375 for High Temperature71
HMP377 Probe for High Humidity Applications72
Figure 28 Dimensions in MM (Inches)72
Table 34 HMP377 for High Humidities72
HMP378 Probe for Pressurized Pipelines73
Figure 29 Dimensions in MM (Inches)74
Table 35 HMP378 for Pressurized Pipelines74
Attaching HMP378 to Process with Fitting Body75
Figure 30 HMP378 Fitting Body and Clasp Nut75
Attaching Ball Valve Kit to Process77
Installing HMP378 with Ball Valve Kit BALLVALVE-179
Figure 31 Inserting HMP378 into Process with Ball Valve Kit79
HMP378F Probe Option for Measuring Oil Moisture and Temperature81
HMP378H Probe Option for Measuring JET A-1 Fuel Moisture and Temperature81
Table 36 HMP378F Measurement Parameters81
Table 37 HMP378H Measurement Parameters82
Installation83
HMT370EX Installation Overview83
Figure 32 Example Wall Installation with HMP373 Probe83
Installation Preparations84
Probe Installation Overview85
HMT370EX Transmitter Dimensions85
Figure 33 Duct Installation Example with HMP373 Probe and Duct Installation Kit85
Figure 34 HMT370EX Transmitter Dimensions85
Mounting86
Figure 35 Mounting HMT370EX Directly through the Transmitter Body86
Attaching Cable Glands and Conduit Fittings87
Wiring88
Figure 36 Wiring Example Using One Cable89
Wiring with Galvanic Isolators90
Figure 37 Wiring Diagram with Galvanic Isolators90
Wiring with Zener Barriers91
Figure 38 Wiring Diagram with Zener Barriers91
Finalizing Installation: Closing Transmitter and Attaching Grounding92
Optional: Testing Analog Output Level with a Multimeter93
Figure 39 Multimeter Test Point Overview94
HMT370 Local Display Interface96
Local Display Overview96
Figure 40 HMT370EX Local Display Examples: Measurement Graph View and Main Menu Screen96
Figure 41 HMT370EX Display Interface Buttons96
Figure 42 2 Parameter View Example97
Figure 43 Graph View Example97
Local Display PIN Code98
Figure 44 Parameter List View Example98
Figure 45 Display PIN Code Button Presses98
Light and Dark Display Themes99
Sleep Mode99
Figure 46 Dark (Left) and Light (Right) Display Theme Examples99
Figure 47 Transmitter Display in Sleep Mode99
HMT370EX Display Main Menu100
Settings Menu100
Figure 48 HMT370EX Display Interface Main Menu100
Figure 49 Settings Menu100
Display Menu101
Figure 50 Display Menu101
Analog Outputs Menu102
Measurement Settings Menu102
Figure 51 Analog Output Settings102
Calibration Menu103
Status Menu103
Figure 52 Calibration Menu103
Figure 53 Status Menu103
Maintenance Menu104
Figure 54 Maintenance Menu104
Operating with Insight PC Software105
Vaisala Insight PC Software105
Basic and Advanced User Modes105
Connecting to Insight PC Software105
Figure 55 Connecting to Insight: Probe Body and Transmitter Service Port Locations106
Installing Driver for the USB Service Cable107
Insight Main View with Transmitter109
Figure 56 Insight Main Menu and Settings: Transmitter View109
Insight Main View with Probe110
Figure 57 Insight Main Menu and Settings: Probe View110
Analog Output Configuration111
Analog Output Configuration Overview111
Figure 58 Analog Output Configuration Options in Insight PC Software111
Configuring Analog Outputs with Insight112
Configuring Analog Outputs with Local Display Interface112
Analog Output Level Test113
Testing Analog Output Level with Local Display Interface113
Figure 59 Multimeter Test Point Overview113
Testing Analog Output Level with Insight114
Environmental Compensation and Measurement Settings116
Environmental Compensation and Measurement Settings Overview116
Configuring Pressure Compensation117
Configuring Filtering Factor118
Figure 60 Filtering Factor Configuration in Insight PC Software118
Configuring Calculation Coefficients119
HMP378F Calculation Model with Average Oil Coefficients119
HMP378F Calculation Model with Oil-Specific Coefficients120
Calibration and Adjustment121
Calibration and Adjustment Overview121
Figure 61 Insight PC Software Calibration View Example121
Figure 62 Local Display Calibration Menu121
Adjusting Measurements with Insight122
Adjusting Measurements with HMT370EX Local Display Interface122
Analog Output Adjustment Overview124
Adjusting Analog Output Level with Insight126
Figure 63 Analog Output Level Adjustment in Insight PC Software126
Adjusting Analog Output Level with Local Display Interface127
Maintenance128
Overview128
Technical Support128
Cleaning128
Changing Probe Filter128
Troubleshooting130
Problems and Their Possible Solutions130
Error Messages132
Restoring Factory Default Settings133
Technical Data134
Specifications134
Table 38 Measurement Performance134
Figure 64 Humidity Measurement Accuracy as Function of Temperature135
Figure 65 Temperature Measurement Accuracy over Full Range135
Table 39 Humicapâ 180L2 Measurement Performance135
Figure 66 a W Measurement Accuracy136
Table 40 HMP378F and HMP378H Ppm Accuracy136
Table 41 Operating Environment137
Table 42 Compliance137
Table 43 Inputs and Outputs137
Table 44 Mechanical Specifications137
HMP371 Specifications138
Figure 67 HMT370EX Transmitter Dimensions138
Table 45 HMP371 for Wall Mounting138
HMP373 Specifications139
Figure 68 Dimensions in MM (Inches)139
Figure 69 Dimensions in MM (Inches)139
Table 46 HMP373 for Confined Spaces139
HMP374 Specifications140
HMP375 Specifications140
Figure 70 Dimensions in MM (Inches)140
Table 47 HMP374 for High Pressure140
Table 48 HMP375 for High Temperature140
HMP377 Specifications141
Figure 71 HMP375 Probe and Stainless Steel Installation Flange141
Table 49 HMP377 for High Humidities141
HMP378 Specifications142
Figure 72 Dimensions in MM (Inches)142
Table 50 HMP378 for Pressurized Pipelines142
Spare Parts and Accessories143
Figure 73 Dimensions in MM (Inches)143
Table 51 Accessory Availability143
Recycling Instructions145
Figure 74 Recyclable and Non-Recyclable Parts in Transmitters with no Display145
Figure 75 Recyclable and Non-Recyclable Parts in Transmitters with no Display after Disposing of Electronics and Probe146
Figure 76 Recyclable and Non-Recyclable Parts in Transmitters with Display147
Figure 77 Recyclable and Non-Recyclable Parts in Transmitters with Display after Disposing of Electrical and Electronic Waste147
Maintenance and Calibration Services149
Warranty149

Vaisala HMT370EX - Wiring with Zener Barriers; Figure 38 Wiring Diagram with Zener Barriers

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