Nortech NX12 User Manual

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August 2018

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NX12

Micro GSM RTU

USER MANUAL

Version 1.8

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Micro GSM RTU

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Publication Notice

Copyright © Nortech Management Limited (NML). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, including photocopying, electronic, mechanical, recording or otherwise, without the prior written permission of the copyright holder.

NML provide this document as is, without warranty of any kind either expressed or implied including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. NML may make changes or improvements in the software, equipment, or specifications described in this document at any time and without notice. These changes may be incorporated in new releases of this document.

This publication could contain technical inaccuracies or typographical errors. NML shall not be liable for any damages (including, but not limited to, consequential, indirect or incidental, special damages or loss of profits or data) even if NML have been informed of their potential occurrence, arising out of or in connection with this document or its use.

English Edition

IBM PC is a trademark of International Business Machines Inc.

Windows is a trademark of Microsoft Corporation.

All other trademark names used in this manual are hereby acknowledged.

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Contents

1 Safety & notices ....................................................................................... 5

1.1 Safety ............................................................................................... 5

1.2 Qualified users ................................................................................... 5

1.3 Notices .............................................................................................. 5

1.4 Versions ............................................................................................ 5

2 NX12 RTU Description ............................................................................... 6

2.1 Applications ....................................................................................... 6

2.2 Central iHost User Interface ................................................................. 6

2.3 Communications ................................................................................. 6

3 NX12 RTU Set-up Requirements ................................................................. 7

3.1 Auxiliary power supply ........................................................................ 7

3.2 Battery Operation ............................................................................... 7

3.3 USB Port / Field Support Kit ................................................................. 7

4 NX12 RTU Firmware Functions .................................................................... 9

4.1 Clock ................................................................................................ 9

4.2 Inputs / Outputs ................................................................................. 9

4.3 Auxiliary Supply On/Off ....................................................................... 9

4.4 Binary Inputs ..................................................................................... 9

4.5 Counter Inputs ................................................................................. 10

4.6 Analogue Inputs ............................................................................... 10

4.7 Output Channels ............................................................................... 11

4.8 RS485 Modbus ................................................................................. 11

4.9 RTU / Communication Events ............................................................. 11

4.10 Data Log Sizes ............................................................................... 11

4.11 Input monitoring during iHost calls .................................................. 11

4.12 Connection between the RTU and iHost ............................................ 11

4.13 Reconfiguration of the RTU settings.................................................. 12

5 NX12 RTU Operation ............................................................................... 13

5.1 Cold Start ........................................................................................ 13

5.2 LED Indicators .................................................................................. 13

5.3 RTU connection to the iHost system .................................................... 13

5.4 Call Retry Algorithm .......................................................................... 13

6 Installation ............................................................................................ 15

6.1 Qualified Users ................................................................................. 15

6.2 AC Powered Models ........................................................................... 15

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6.3 DC Powered Models .......................................................................... 15

6.4 Procedure ........................................................................................ 15

6.5 Circuit Board Layout ......................................................................... 15

6.6 PCB Connections .............................................................................. 16

6.7 Wiring Connection Diagrams .............................................................. 18

6.7.1 Digital Inputs ............................................................................. 18

6.7.2 Analogue Inputs ......................................................................... 19

6.7.3 Output Channels ......................................................................... 20

6.8 Enclosure and mounting .................................................................... 21

6.8.1 DIN Rail option ........................................................................... 21

6.8.2 Enclosure option ......................................................................... 21

7 Maintenance .......................................................................................... 22

7.1 Technical assistance .......................................................................... 22

7.2 Communications test ........................................................................ 22

7.3 I/O tests .......................................................................................... 22

7.4 Replacing the Battery ........................................................................ 22

7.5 Recycling ......................................................................................... 23

8 Specification Data .................................................................................. 24

8.1 General ........................................................................................... 24

8.2 AC powered units ............................................................................. 24

8.3 DC powered units ............................................................................. 24

8.4 EMC ................................................................................................ 25

8.5 Environmental .................................................................................. 25

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1 Safety & notices

1.1 Safety

For AC supply variants:

The AC supply should be isolated prior to opening the enclosure and should not be reconnected until the enclosure lid is secured.

Isolate from Mains before removing cover.

1.2 Qualified users

Users should ensure they are suitably trained and qualified prior to working on the NX12.

Installation should be carried out in accordance with local procedures and company safety and operational guidelines.

1.3 Notices

Battery

Do not attempt to charge the battery – risk of explosion. Do not short circuit, crush, disassemble or heat above 100°C, incinerate or expose contents to water.

AC Supply

(only applies to AC powered models)

Isolate from Mains before removing cover.

100-240V AC

50-60Hz

100mA rated current

DC Supply

(only applies to DC powered models)

12-24V DC

500mA rated current

Disposal

Battery and NX12 unit should be disposed of in accordance with local regulations.

1.4 Versions

This document describes the current build version and software functionality of the NX12 product. Earlier versions and software releases may differ. Please consult Nortech for earlier versions of this document.

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2 NX12 RTU Description

2.1 Applications

The NX12 RTU (Remote Terminal Unit) is a telemetry device that is suitable for use in fixed site alarm monitoring and control applications.

The NX12 provides monitoring and control of equipment via digital inputs, counter inputs, analogue inputs, control outputs and RS485 (using Modbus RTU). Typical applications include:

▪ LV substation monitoring and control. ▪ Pump and pump station monitoring. ▪ Wind farm site monitoring. ▪ General plant alarm panel monitoring. ▪ Tank level monitoring. ▪ Circuit breaker operation monitoring. ▪ Fault Passage Indicator monitoring.

2.2 Central iHost User Interface

The NX12 is remotely monitored from the Nortech “iHost” system. Users access

iHost via a unique username and password. The iHost system stores and displays equipment status and alarm data, along with related event history and statistics. It also provides remote NX12 configuration tools. Data is displayed in lists, record details, maps, diagrams, tables and graphs.

For larger customers, a dedicated private iHost System can be installed at their own premises on their own servers.

The functionality of the iHost User Interface is beyond the scope of this document.

2.3 Communications

The NX12 includes an in-built, quad-band GPRS wireless modem and antenna. There are 3G and 4G factory options available for different regions – please contact Nortech to discuss your requirements.

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3 NX12 RTU Set-up Requirements

3.1 Auxiliary power supply

The NX12 requires an auxiliary AC or DC supply (factory set option).

AC powered units

The NX12 requires a two (2) wire AC supply. Observe correct polarity.

It is the users’ responsibility to ensure local wiring regulations are complied with

during installation.

AC powered units may be fitted with a long life, non-rechargeable, lithium battery to power the unit when the AC supply is off.

Suitable batteries and replacements are available from Nortech.

DC powered units

The NX12 requires a 12-24V DC supply. Observe correct polarity.

It is the users’ responsibility to ensure local wiring regulations are complied with

during installation.

DC powered units may be fitted with a long life, non-rechargeable, lithium battery to power the unit when the DC supply is off.

Suitable batteries and replacements are available from Nortech.

3.2 Battery Operation

The NX12 monitors its auxiliary power supply. When the auxiliary supply is lost, provided a battery is connected, the unit will continue to operate as follows:

Condition

Behaviour

First 1 minute after loss of auxiliary supply

Normal operation. Modem is switched off once the loss of supply is

reported to the Host.

1 minute to 12 hours (configurable) after loss of auxiliary supply

Low power mode: Modem switched off, will be turned on for

communications as required. Analogue and Digital Inputs scan rate reduced to

250ms. RS485 Modbus polling stops.

12 hours (configurable) after loss of supply

Conserve battery: Unit auto powers off. Unit will restart when auxiliary supply returns.

3.3 USB Port / Field Support Kit

The NX12 is normally shipped with the customer’s default parameter values already

configured.

The NX12 provides a USB interface to allow the user to configure operational parameters from a laptop/PC. Parameters are stored in non-volatile memory (they are retained during power outages).

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The NX Field Support Kit (FSK) is a software application that enables users to interrogate the status and settings of the RTU and to inspect the archived logs.

The principle use of the FSK is to set the connection details that enable communication between the RTU and the iHost system via a mobile network. This entails configuring the SIM card(s) within the RTU. Once connection has been established, the NX12 RTU may be reconfigured remotely from the iHost system.

The NX FSK is described in a separate document.

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4 NX12 RTU Firmware Functions

The features below describe the functionality offered by the latest version of NX12 firmware at the time of writing.

4.1 Clock

The RTU has an internal Real Time Clock (RTC). The clock is synchronised with the iHost system clock on a regular basis.

Date/time stamping in Event and System logs is recorded to 10ms in granularity.

4.2 Inputs / Outputs

There are 16 digital inputs. These can be individually configured to operate as either a Binary Input or as 16-bit Counter Input.

There are 8 analogue inputs with 8-bit resolution.

There are 8 output lines.

The RS485 serial port is used to collect additional data from external devices via the Modbus RTU protocol – contact Nortech for a list of supported devices.

4.3 Auxiliary Supply On/Off

The incoming auxiliary supply line is monitored. The default setting is to date/time stamp changes of state (loss / restoration) and to immediately report them to the iHost system.

A configurable debounce timer can be used to extend the period that the auxiliary supply must change state before an event is logged and reported.

4.4 Binary Inputs

The following features are supported and remotely configured for each input individually:

Enabled

The input is monitored.

Status

Closed or Open. Status is reported to the iHost during every communication.

Debounce

How long the input must be open (or closed) before a change of state is confirmed.

Log Open

Yes = create a date/time log entry when the input changes from Closed to Open.

Log Close

Yes = create a date/time log entry when the input changes from Open to Closed.

Report on Open

Yes = initiate an immediate iHost communication as soon as an Open event is generated.

Report on Close

Yes = initiate an immediate iHost communication as soon as a Close event is generated.

In ideal conditions, the processor detects changes of state within 10ms.

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4.5 Counter Inputs

The following features are supported and remotely configured for each input individually:

Enabled

The input is monitored.

Current Value

A 16-bit number which is converted to a 32-bit number with scaling at the iHost system. The current value is reported to the iHost system during every communication. When the 16-bit maximum is reached the counter rolls back to zero and continues.

Debounce

How long the input must be open (or closed) before a change of state is confirmed.

Increment on Open

Yes = increment the current value by 1 when the input changes from Closed to Open.

Increment on Close

Yes = increment the current value by 1 when the input changes from Open to Closed.

30-min Datalogging

Yes = create a data log entry for the input with how many counts the current value increased by for each 30-minute period of the day. The 30-minute data logs are reported to the iHost system during routine communications.

In ideal conditions, the processor detects changes of state within 10ms.

4.6 Analogue Inputs

The following features are supported and remotely configured for each input individually:

Enabled

The input is monitored.

Level

An 8-bit value. The Level is reported to iHost during every communication.

Routine Datalogging

Yes = Take a date/time stamped routine level reading at the frequency specified (1 min to 24 hours). Date/time entries are reported during the next iHost communication.

Dead band Crossing Logging

Each input has a dead-band percentage. When the level changes by an amount exceeding the dead-band, the RTU adds a date/time stamped entry in the analogue input log.

Threshold Crossing Logging

Each input has 4 threshold levels providing 5 zones. When the level crosses a threshold, the RTU adds a date/time stamped entry in the analogue input log.

Report on Dead band

Yes = initiate an immediate iHost communication as soon as a dead-band-crossed event is generated.

Report on Threshold

Yes = initiate an immediate iHost communication as soon as a threshold-crossed event is generated.

Debounce

How long the input must be in a new zone (or deadband) before a threshold crossing (or dead-band crossing) is confirmed.

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In ideal conditions the processor scans the analogue inputs every 10ms.

4.7 Output Channels

The following features are supported and remotely configured for each switched output channel. It is expected that applications will use the Output Channels to drive external relays:

Energise

Energises the output. Has no effect if output is already energised.

De-energise

De-energises the output. Has no effect if output is already de-energised.

Energise Pulse

Energises, pauses, then de-energises the output.

De-energise Pulse

De-energises, pauses, then energises the output.

Pulse Duration

Configurable pulse width from 50ms to 12.75 seconds in 50ms increments.

4.8 RS485 Modbus

The NX12 uses the Modbus RTU protocol to poll for data from connected Slave devices. Modbus I/O mappings are loaded into the NX12 using a script file. Please contact Nortech for assistance configuring the Modbus interface.

4.9 RTU / Communication Events

GSM signal strength is reported to the iHost system. Communication failures are date/time stamped, logged and reported to the iHost system.

The PCB temperature within the RTU is also reported to the iHost system.

4.10 Data Log Sizes

Data logs are stored in non-volatile memory and include local date/time stamps.

▪ Binary Input Log – 1024 date/time stamped entries. ▪ Counter Input Log – 1024 date/time stamped entries. ▪ Analogue Input Log – 1024 date/time stamped entries. ▪ RTU Events Log – 1024 date/time stamped entries. ▪ Counter 30-minute Data Logs – 256 date/time stamped entries.

When a log entry fills, a “buffer overrun” event is logged (to identify a loss of data)

and then the log loops back and overwrites the oldest data. Buffer overrun log entries are themselves date/time stamped and reported to the iHost system.

4.11 Input monitoring during iHost calls

Inputs continue to be monitored during calls to the iHost system. Depending upon the log configuration, this may result in an immediate new call to the iHost system.

4.12 Connection between the RTU and iHost

During contact with the iHost system, the RTU performs the Slave function, serving information upon request from the iHost system, which performs the Master function. Data is transferred, in each direction, using a secure protocol.

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Information from the RTU is stored in the iHost database, where it may be viewed by users.

4.13 Reconfiguration of the RTU settings

The operational behaviour of the RTU, including which inputs are enabled and how data is reported and stored, is configurable from the iHost system and hence does not require a site visit.

When an iHost User makes changes to these settings, the new settings will be loaded into the RTU during the next contact between the iHost system and the RTU.

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5 NX12 RTU Operation

5.1 Cold Start

The RTU is configured to monitor for a processor power-up event, occurring after periods without mains and battery back-up power. This is known as a “Cold Start”. The RTU will then initiate communication with the iHost system.

5.2 LED Indicators

The processor LEDs are used to indicate both the operational state and the communication state of the RTU.

Diagnostic LED

Condition

Meaning

LED1 (top)

Steady Flashing

Processor working.

LED1

On for 5 seconds

Communication to host successfully completed.

LED1

Quick Flash

TX Host/Modem Data.

LED2

Steady Flashing

Last communication failed. In retry sequence.

LED2

On for 5 seconds

Communication to host failed.

LED2

Quick Flash

RX Host/Modem Data.

LED3

Quick Flash

RS485 TX Data.

LED4

Quick Flash

RS485 RX Data.

Led 5 (bottom)

various

Driven directly by the modem.

5.3 RTU connection to the iHost system

The NX12 RTU connects to the iHost system when:

▪ An event that is configured to initiate a connection occurs. ▪ The “Next Routine Call” date/time is reached or exceeded. ▪ The user presses the test button (PCB identifier SW1).

A configurable “Routine Health Check Interval” is configured by the iHost system. Typically, this is set between 1 hour and 3 hours, however the range for the interval setting is from 1 minute to 28 days.

An event configured to cause an immediate communication to the iHost system will do so regardless of when the next routine health check is due.

5.4 Call Retry Algorithm

If a connection to the iHost system fails, then the RTU enters its retry sequence.

The RTU retries in a block of 10 attempts, approximately 1 minute apart. Then it waits a (re)configurable time before starting another block of 10 attempts. This repeats until communications is restored.

During this period, if any new events configured as “Immediate Contact Host”

occur, then the RTU will immediately start attempting to contact the iHost system.

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Failed communication attempts are date/time stamped by the RTU, along with the reason for the failure. These logs are reported to the iHost system upon the next successful contact.

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6 Installation

6.1 Qualified Users

Users should ensure that they are suitably trained and qualified prior to working on the RTU.

6.2 AC Powered Models

The AC supply should be isolated prior to opening the enclosure and should not be reconnected until the enclosure lid is secured.

The AC Power Supply should be rated at 230 Volts or 115 Volts, operating at a frequency of 50Hz.

The power supply to the RTU should be:

▪ Connected via a switch or circuit breaker. ▪ Close to the RTU and within easy reach of an operator. ▪ Marked as the disconnection device for the RTU.

6.3 DC Powered Models

The DC Power Supply should be rated at 12 Volts or 24 Volts.

6.4 Procedure

The following steps must be completed in the order set out below.

1. Configure the NX12 prior to installation (this may be done at the factory).

2. Connect the external equipment to be monitored to the I/O terminals on the

NX12.

3. Connect the auxiliary power supply (do not switch it on yet).

4. Connect the battery (if one is required).

5. Secure the NX12 lid (for units with an enclosure).

6. Switch on auxiliary power. Confirm that the NX12 RTU successfully

communicates with the iHost system.

7. Test the unit by confirming that all inputs and outputs report the correct

status and events.

8. Confirm that at least two calls to the iHost system are successful (this ensures

that the settings are synchronised).

9. If a lithium battery is included: ▪ Remove the auxiliary supply and confirm that the RTU continues to operate

using battery power.

▪ Restore the auxiliary supply.

6.5 Circuit Board Layout

The Printed Circuit Board (PCB) hardware is manufactured as shown in the diagram below.

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Ensure that the correct auxiliary supply is provided for the model being used. Where fitted, the battery should be plugged in.

Digital Inputs should be volt-free dry contacts.

Analogue Inputs should be 4-20mA (factory option for 0-10V).

Output channels can switch up to 100mA.

NX12 Terminal Blocks, Sockets, Plugs

SK2

TB4

TB2 TB1

TB5 TB3

SK4

TB6

SK3

SW1 PL2

LED 1

LED 5

...

SK1

PL1

TB7

Pin 1Pin 1Pin 1Pin 1Pin 1

Pin 1 Pin 1

X X

6.6 PCB Connections

PCB Ref.

Function

Comment

TB7

AC Supply Live (110-230V AC)

Unit is factory set as either AC powered or DC powered unit.

TB7

AC Supply Neutral

TB6

DC supply +ive (12-24V DC)

TB6

DC supply 0V

PL2

Lithium battery

SW1

User button

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PCB Ref.

Function

Comment

SK2

Micro USB

SK3

GSM SMA antenna connector

SK4

SIM card carrier

TB4

Not connected

TB4

Digital Input #8

TB4

Digital Input #7

TB4

Digital Input #6

TB4

Digital Input #5

TB4

Digital Input #4

TB4

Digital Input #3

TB4

Digital Input #2

TB4

Digital Input #1

TB4

Common

TB2

Not connected

TB2

Digital Input #16

TB2

Digital Input #15

TB2

Digital Input #14

TB2

Digital Input #13

TB2

Digital Input #12

TB2

Digital Input #11

TB2

Digital Input #10

TB2

Digital Input #9

TB2

Common

TB3

Do not use

TB3

Analogue Input #8

TB3

Analogue Input #7

TB3

Analogue Input #6

TB3

Analogue Input #5

TB3

Analogue Input #4

TB3

Analogue Input #3

TB3

Analogue Input #2

TB3

Analogue Input #1

TB3

Common

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PCB Ref.

Function

Comment

TB5

Not connected

TB5

Digital Output #8

TB5

Digital Output #7

TB5

Digital Output #6

TB5

Digital Output #5

TB5

Digital Output #4

TB5

Digital Output #3

TB5

Digital Output #2

TB5

Digital Output #1

TB5

Common

TB1

RS485 TX/RX +ive

TB1

RS485 TX/RX -ive

TB1

RS485 + wake up

Not implemented

TB1

RS485 Ground/Common

PL1

1-6

Programming port

Do not use

1-16

Expansion header

SK1

Not used

6.7 Wiring Connection Diagrams

6.7.1 Digital Inputs

Connecting the RTU to a volt-free dry contact input

Input n

Common

RTU Digital

Input Terminals

Equipment Monitored

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6.7.2 Analogue Inputs

Connecting the RTU to a 2-wire sensor (4-20mA)

Input n

18V

RTU Analogue

Input Terminals

Transducer / Sensor

Connecting the RTU to a 4-wire sensor (4-20mA)

Input n

Common

RTU Analogue

Input Terminals

Transducer / Sensor

Sensor 4-20mA output signal

Sensor power

supply

18V

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6.7.3 Output Channels

Outputs switch 100mA.

Example connecting the RTU to an external relay

Output n

Common

RTU Output

Terminals

External

Relay

V +

DC Supply

Equipment

Controlled

Connect dotted line when additional back emf protection required when switching inductive loads, for example relays.

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6.8 Enclosure and mounting

6.8.1 DIN Rail option

NX12 supplied as a DIN rail mountable unit

6.8.2 Enclosure option

NX12 supplied in an IP54 polycarbonate enclosure

180.0mm

182.0mm

165.0mm

7.5mm

FRONT OF ENCLOSURE

90 mm DEPTH

REAR OF ENCLOSURE

SHOWING 4 FIXING HOLES

167.0mm

Ø 4.5mm

7.5mm

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7 Maintenance

The Auxiliary supply should be isolated prior to opening the enclosure and should not be reconnected until the enclosure lid is secured.

7.1 Technical assistance

In case of technical assistance please contact either the supplier of the NX12 or Nortech. If a malfunction occurs, please contact Nortech.

Please see www.nortechonline.co.uk for contact details.

7.2 Communications test

Press the button (SW1) at the top left of the PCB. Confirm that the RTU communicates successfully with the iHost system.

7.3 I/O tests

For each input connected to the NX12, confirm that the correct status data and the desired date/time events are being reported to the iHost system.

7.4 Replacing the Battery

When replacement is necessary, contact Nortech for a replacement part.

There are two types of battery, depending on the PCB hardware version:

2 pin battery connectors

NX12’s with 2 pin battery

connectors require 3.6V lithium battery:

▪ Part number: ACC-0751

3 pin battery connectors

NX12’s with 3 pin battery

connectors require 7.2V lithium battery:

▪ Part number ACC-1010

To replace the battery, unplug the old battery pack and plug in the new pack.

Re-test the NX12 unit for correct operation.

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7.5 Recycling

After replacing the internal battery, dispose of the old lithium battery responsibly, in accordance with local rules.

NX12 units can be returned to Nortech for recycling at the end of their life.

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8 Specification Data

8.1 General

AC supply (AC powered units only)

100-240V AC, 50-60Hz. 100mA rated current. See additional information below.

DC supply (DC powered units only)

12-24V DC. 500mA rated current.

Battery (where connected)

Lithium-thionyl chloride (Li-SOCl2). Nominal 5.8Ah.

3.6V single cell pack. Lithium content approx. 3.4g.

7.2V twin cell pack. Lithium content approx. 6.8g. Maintenance interval 10 years or when exhausted.

Local Indication

Surface mount LEDs.

Hardwired Digital Inputs

Qty 16. Configurable as alarm or counter inputs.

Hardwired Digital Outputs

Qty 8. Transistor outputs.

Hardwired Analogue Inputs

Qty 8. 0-25mA inputs. Configurable alarm thresholds.

Additional I/O

Additional I/O is achieved via the RS485 Modbus interface.

Local Serial Data

Modbus over 3 wire RS485.

Remote Indication

GSM modem with SMA antenna. NEXUS protocol, supported on the iHost system.

8.2 AC powered units

The NX12 requires a two (2) wire AC supply. Connect with the correct polarity.

It is the users’ responsibility to ensure that local wiring regulations are complied

with during installation.

It is recommended that a Ferrite be fitted to the AC power cable (suitable part Wurth Elektronik, PN 742 700 44).

The power supply to the RTU should be:

1. Connected via a switch or circuit breaker.

2. Close to the RTU and within easy reach of an operator.

3. Marked as the disconnection device for the RTU.

8.3 DC powered units

The NX12 requires a DC supply. Connect with the correct polarity.

It is the users’ responsibility to ensure that local wiring regulations are complied with during installation.

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8.4 EMC

The NX12 has been designed and manufactured to meet the following standards.

Emissions EN61326-1: 2006 Class B Emissions, Industrial locations

EN55011 Mains terminal disturbance voltage EN55011 Electromagnetic radiation disturbance EN61000-3-2 Harmonic current emissions EN61000-3-3 Flicker (not applicable)

Immunity EN61326-1:

EN61000-4-2 ESD EN61000-4-3 EM Field EN61000-4-4 Burst EN61000-4-6 Conducted RF EN61000-4-8 Power Frequency Magnetic Field EN61000-4-11 Voltage Dips and Interruptions

8.5 Environmental

Enclosure Rating: IP54

Humidity: 0-95% non-condensing

Temperature: PCB: -20 to +70 degrees C.

Battery: -60 to +85 degrees C.

GSM modem: -40 to +85 degrees C.

Storage: The NX12 should be stored in an environment that is dry,

corrosive-free, and not in direct sunlight.

Correct storage prevents premature component failures

caused by environmental factors such as moisture or corrosive gases. Exposure to high humidity or corrosive environments will prematurely degrade the electronic components in any electronic device regardless of its use or manufacturer.

Nortech NX12 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual