Danfoss Gas detection unit Accessory Data sheet

Data Sheet

Gas detection unit

Accessory

Controller unit

Used for detecting and warning of hazardous gas
concentrations in industrial refrigeration

The gas detection Controller Unit is used for a
centralized monitoring and warning of
hazardous gas concentrations. The input
signals for the controller are collected from the
local gas detection units of the types Basic,
Premium and Heavy Duty via RS485 Fieldbus or
Analog communication. In total 96 gas
detection sensors can be handled via Fieldbus
+ 4 via Analog directly on the controller (+28
additional possible if expansion modules
added).

The Controller Unit comes with 4 alarm relays
available for external looped alarm devices.
Additional relays and sensor wiring loops is
possible by adding Expansion modules to the
controller.

Each local gas detection unit is assigned a
unique address in the Controller and by
continuous communication with the individual
GDU’s the Controller reacts on alarm signals
from the local GDU. The parameter setting and
the actual state of each local GDU can be read
in the Controller display.

AI272548380512en-000202

Gas detection unit, Accessory

Features

• For connection of up to 96 sensors via eldbus + 32 via Analog”(when 7 expansion modules added)

• Easy conguration via intuitive user-interface; helps simplify operator handling and minimize risk of operational
setting errors

• Simple commissioning by standard parameter conguration

• Flexible connection to local gas detection units by either Analog or RS485 eldbus communications

• Fieldbus wiring: Wire length up to 900 meters (2953 ft.) per segment

• 4 relays for external alarm device circuits

• Up to 7 Expansion modules possible; allows additional 7 segments with a total of 7200 meters (23622 ft.) wiring
and a total of 32 relays for alarm device circuits

• Automatic self-diagnostics to ensure correct communication and operation

• Relay for communication error

• 6 menu languages

• Password protected settings allowing authorized access only

• Service alerts on display

• Conformity to EN 50545-1

• Enables regulatory compliance with EN 378:2016, ISO 5149:2014

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Description

Values

Used for product

Basic, Premium and Heavy Duty

Net weight

0.28 kg

Working temperature

-5 °C – 40 °C (23 °F – 104 °F)

Packing format

Single pack

Gas detection unit, Accessory

Portfolio overview

Figure 1: Gas detection Controller unit

Table 1: Portfolio overview

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Gas detection unit, Accessory

Applications

Detecting and warning of hazardous gas concentrations in industrial refrigeration systems such as food and
beverage processing areas, cold storages, and on-board ships.

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Gas detection unit, Accessory

Media

Refrigerants

The Danfoss Gas Detection Solution provides a high degree of exibility when designing and building your gas
detection system.

The portfolio ranges from basic to heavy duty models complemented by a range of accessories. The gas detection
units (GDU) can detect a wide range of refrigerant gases including Ammonia (R717), CO2 (R744), uorinated
refrigerants (HCFC and HFCs), and Propane (R290). They come with various sensor technologies to match the
specic refrigerant, application, and safety requirements of the refrigeration system including electrochemical (EC),
semiconductor (SC), Pellistor (P), and infrared sensors.

To provide a strong plug and play solution, all gas detection units come factory precongured to match refrigerant
and typical PPM setting requirements. Depending on national regulations PPM settings may be subject to change.

New refrigerants

Danfoss products are continually evaluated for use with new refrigerants depending on market requirements.

When a refrigerant is approved for use by Danfoss, it is added to the relevant portfolio, and the R number of the
refrigerant (e.g. R513A) will be added to the technical data of the code number. Therefore, products for specic
refrigerants are best checked at store.danfoss.com/en/, or by contacting your local Danfoss representative.

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Visualization

LCD

Two lines, 16 characters each, illuminated

Status LED (4)

Operation – fault – 1st alarm – ≥ 2nd alarm

Operation

6 push-buttons

Menu language (selectable)

German, English, Dutch, USA, French, Swedish

Interface eldbus

Transceiver

RS 485 / 19200 Baud

Gases

Digital and analog sensors for toxic, combustible & refrigerant gases

Physical

Enclosure

Plastic housing ABS

Colour

RAL 7035

Protection class

IP 40

Weight

0.3 kg (0.8 lb.)

Packaging volumes

Ca. 4.4 l

Mounting

Top DIN rail mounting, installation in distribution box

Dimensions (Controller unit)

(W x H x D) 106 x 110 x 62 mm (4.2 x 4.3 x 2.4 in.)

Dimensions (Controller Solution)

(W x H x D) 298 x 420 x 140 mm (11.7 x 16.5 x 5.5 in.)

Wire connection:

Power supply
Output
Input

Screw type terminal: 2.5 mm2 (14 AWG)
2 x spring type terminal: min. 0.5 mm2, max. 1.5 mm2 (22 to 16 AWG)
Spring type: min. 0.5 mm2, max. 1.5 mm2 (22 to 16 AWG)

Interface ModBus RTU RS 485

Function

Transmission of current and average values, alarm and relay status, and analog
output states in MODBus RTU RS 485 protocol to external devices

Humidity

15 – 95 % RH non-condensing

Working temperature

-5 °C – 40 °C (23 °F to 104 °F)

Storage temperature

0 °C – 40 °C (32 °F to 104 °F)

Gas detection unit, Accessory

Product specication

Design

Table 2: Design

Enviromental conditions

Table 3: Enviromental conditions

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Digital output

Power/

Main Bus

Controller unit

Relay
AR 01

+-

Main Bus_A

AI_01

AI_02

AI_03

AI_04

AO_01

AO_02

X10

X2X1 X2

X11

X12

D1 D2 D3 D4

7

1

134 10

4 6

2 8

2

14

4

5 11

5 7 8 9 10 11 12

3 9

3

15

3

6 12

< 24 VDC

<

0 VDC

1

24 VDC

24 VDC

0 VDC

0 VDC

Main Bus_A

Field Bus_A

Main Bus_B

Field Bus_B

2

A

Power Analog

output

AP01 AP02 AP03 AP04

4-20 mA

24 VDC

1 2 3 4

Analog

input

B

Relay
AR 02

Relay

AR 03

Relay
AR 04

Main Bus_B

24 VDC

0 VDC

4-20 mA

24 VDC

4-20 mA

24 VDC

4-20 mA

24 VDC

Danfoss

148H144

31 52

X_Bus

X_Bus

0 VDC

Relay

DRF

Relay

Fault

Field Bus_A

Field Bus_B

Digital

input

Field Bus

DI_01

DI_02

DI_03

DI_04

Electrical

Description

Power supply

24 V DC ± 20 %

Power consumption (24 V DC)

4 W, 150 mA

Analog input (4)

4 – 20 mA, overload and short-circuit- protected, input resistance 200 Ω

Tension for external analog transmitter

24 V DC (same as power supply), max. 100 mA / per sensor

Analog output (2) congurable for each input

Proportional, overload and short-circuit- protected, charge ≤ 500 Ω
4 – 20 mA = measuring range

3.0 < 4 mA = underrange
>20 – 21.2 mA = overrange

2.0 mA = fault

Alarm relay (4)

250 V AC, 5 A, potential-free, change-over (SPDT)

Fault relay (1)

250 V AC, 5 A, potential-free, normally open contact (SPST)

Gas detection unit, Accessory

Electrical connection

Figure 2: Circuit connection



NOTE:

RJ45 port available on the controller.

Table 4: Electrical connection

Fieldbus loop

Each GD controller can handle up to 96 sensors and handle any mix of individual Gas detection units of the types
Basic, Premium and Heavy Duty.

The max. recommended loop wire length is 900 meter (2953 ft) per segment.

With additional segments (and additional controller expansion modules) the max recommended loop wire length is
7200 meter (23622 ft).

The controller and the last GDU in each segment must be provided with a resistor of 560 Ohm. A Umin of 16 V DC
must be secured at any spot in the loop.

Below gure shows how to make proper connections between the controller and each GDU.

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GDU Addr. 05 GDU Addr. 04

560 R

Controller Unit

0 V DC

24 V DC

BUS_B

BUS_A

0 V DC

24 V DC

4
3
2
1

4
3
2
1

4
3
2
1

4
3
2
1

4
3
2
1

U

min

= 16 V DC

GDU Addr. 01 GDU Addr. 02 GDU Addr. 03

Danfoss

148H139

GDU Addr. 05 GDU Addr. 04

GDU Addr. 01 GDU Addr. 02 GDU Addr. 03

Controller

unit

= Terminatingresistor 560 OhmR

R

R

= GDU (Basic, Premium and/or Heavy Duty)

R

R

RIGHT

WRONG

Controller

unit

Controller

unit

Wire length max. 900 meter (2953 ft) per segment.
More segments with additional expansion modules max. 7200 meter (23622 ft).
Additional power limitations must be calculated.

Danfoss
148H123

Gas detection unit, Accessory

Figure 3: Controller unit conections

Figure 4: Connections between the controller and each GDU

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Description

Code number

Controller unit

148H6231

Controller solution (controller + enclosure)

148H6221

Controller solution Uptime

148H6237

Warning module (wire break monitoring module)

148H6223

Controller expansion module

148H6222

Gateway for controller

148H6228

Gas detection unit, Accessory

Ordering

Table 5: Ordering

Controller solution

Controller unit placed in an enclosure ready to be connected to a power source. A separate uptime solution with
UPS for the controller is available.

Warning module (wire break monitoring module)

The warning module is used for monitoring the circuiting to the warning/alarm devices on a centrally controlled gas
detection system. Wire breaks or wire interruptions in the alarm device loop will be reported to the central control.

Controller expansion module

The gas detection Controller Expansion module is used for expansion of the cable coverage in terms of number of
loops and the total wire length. Each Controller Unit can handle up to 7 Expansion modules allowing additional 7
segments with a total of 7200 meters (23622 ft.) wiring and a total of 32 relays for alarm device circuits.

Gateway for controller

The gateway is an addition to the controller and used for communicating via Modbus TCP/IP.

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EMC – Directive 2014/30/EU
Low voltage directive 2014/35/EU
EN 50545-1, EN 50271

Gas detection unit, Accessory

Certicates, declarations, and approvals

The list contains all certicates, declarations, and approvals for this product type. Individual code number may have
some or all of these approvals, and certain local approvals may not appear on the list.

Some approvals may change over time. You can check the most current status at danfoss.com or contact your local
Danfoss representative if you have any questions.

Table 6: Compliance table

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Online support

Danfoss oers a wide range of support along with our products, including digital product information, software,
mobile apps, and expert guidance. See the possibilities below.

The Danfoss Product Store

The Danfoss Product Store is your one-stop shop for everything product related—no matter where
you are in the world or what area of the cooling industry you work in. Get quick access to essential
information like product specs, code numbers, technical documentation, certications, accessories,
and more.
Start browsing at store.danfoss.com.

Find technical documentation

Find the technical documentation you need to get your project up and running. Get direct access to
our ocial collection of data sheets, certicates and declarations, manuals and guides, 3D models
and drawings, case stories, brochures, and much more.

Start searching now at www.danfoss.com/en/service-and-support/documentation.

Danfoss Learning

Danfoss Learning is a free online learning platform. It features courses and materials specically
designed to help engineers, installers, service technicians, and wholesalers better understand the
products, applications, industry topics, and trends that will help you do your job better.

Create your Danfoss Learning account for free at www.danfoss.com/en/service-and-support/learning.

Get local information and support

Local Danfoss websites are the main sources for help and information about our company and
products. Find product availability, get the latest regional news, or connect with a nearby expert—all
in your own language.

Find your local Danfoss website here: www.danfoss.com/en/choose-region.

Spare Parts

Get access to the Danfoss spare parts and service kit catalog right from your smartphone. The app
contains a wide range of components for air conditioning and refrigeration applications, such as
valves, strainers, pressure switches, and sensors.

Download the Spare Parts app for free at www.danfoss.com/en/service-and-support/downloads.

Any information, including, but not limited to information on selection of product, its application or use, product design, weight, dimensions, capacity or any other
technical data in product manuals, catalogues descriptions, advertisements, etc. and whether made available in writing, orally, electronically, online or via download,
shall be considered informative, and is only binding if and to the extent, explicit reference is made in a quotation or order conrmation. Danfoss cannot accept any
responsibility for possible errors in catalogues, brochures, videos and other material. Danfoss reserves the right to alter its products without notice. This also applies to
products ordered but not delivered provided that such alterations can be made without changes to form, t or function of the product. All trademarks in this material
are property of Danfoss A/S or Danfoss group companies. Danfoss and the Danfoss logo are trademarks of Danfoss A/S. All rights reserved.

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