Datasheet

ManualsBrandsDanfoss ManualsMeasuringgas detection units - Types GD Basic and Basic+

The Basic and Basic+ gas detection units are used

for monitoring and warning of hazardous gas

concentrations. They can be used for detecting

commonly used refrigerants. Depending on

the application, they are available with an

electrochemical or a semiconductor sensor.

The Basic and Basic+ gas detection units are

intended to be connected to a central system like

Gas Detection Controller Unit, or a PLC, by either

Analog or RS485 open Modbus communications.

The central system converts the alarm signal from

the Basic unit to activation of alarm devices.

The gas detection units come with a factory

default, 2-step alarm set-up ready for use. The

integrated software enables the user to congure

two individual alarm ranges. Alarm 1, a pre-alarm

indicating the gas level has passed a predened

treshold 1, and - if the gas level passes predened

treshold 2 - the nal alarm 2.

Features • Digital, factory congured and pre-calibrated

gas detectors for plug-and-play installation (no

adjustment required)

• Easy conguration via intuitive user-interface;

helps simplify operator handling and minimize

risk of operational, settings and calibration

errors

• Flexible connection - by either Analog or RS485

open Modbus communications

• Fieldbus wiring - connect and power up

to 96 sensors, wire length max. 900 meter

per segment; expansion modules permits

additional segments

• Automatic self-diagnostics to ensure correct

communication and operation

• Sensor seal cap to prevent premature exposure

during installation

• Digital user interface ensures higher sensor

accuracy

• Reduced risk of false alarms due to

temperature compensated sensors

• Password protected alarm settings allowing

authorized access only

• LED status signals and alarms

• Buzzer & Light option for local audio and visual

alarms (Basic+)

• On-board acknowledge button to reset alarms

and to verify the that no gas leaks are present

• Service alerts on unit, controller or both,

readable via service tool Display

• Quick and precise calibration procedures -

either by Plug & Play replacement sensors or

calibration with gas. No potentiometers or

multi-meters required

• For improved safety and to optimize the

lifetime of the sensor, degenerated sensors

with too low sensitivity (<30%) are rejected

during calibration process.

• Conformity to EN 50271, EN 61010-1, ANSI/UL

61010 1, CAN/CSA-C22.2 No. 61010-1

• Enables regulatory compliance with EN

378:2016, ISO 5149:2014, IIAR 2-2017, and

ASHRAE 15:2016

Data sheet

Danfoss gas detection units

Types GD Basic and Basic+

AI272545693488en-000303 | 1

Summary of content (10 pages)

PAGE 1
Data sheet Danfoss gas detection units Types GD Basic and Basic+ The Basic and Basic+ gas detection units are used for monitoring and warning of hazardous gas concentrations. They can be used for detecting commonly used refrigerants. Depending on the application, they are available with an electrochemical or a semiconductor sensor.
PAGE 2
Data sheet | Danfoss gas detection units, types GD Basic and Basic+ Contents Page Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Working principle/Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Service and maintenance . . . . . . . . . . . . . . . . . . .
PAGE 3
Data sheet | Danfoss gas detection units, types GD Basic and Basic+ Working principle/Operation One sensor can be connected to the Basic/ Basic+ sensor board via local bus. The Sensor board provides the power supply of the sensor and prepares the measured data for digital communication. The operation menu of the Basic/Basic+ software is accessed through the connected Gas Detection Controller or via the dedicated GD Service tool (or PC tool).
PAGE 4
Data sheet | Danfoss gas detection units, types GD Basic and Basic+ Specifications Electrical Power supply Power consumption (24 V DC) Outgoing line local bus Power supply 19 – 29 V AC/DC, DC reverse-polarity protected Max. 250 mA (6 VA) 5 V DC, 250 mA max.
PAGE 5
Data sheet | Danfoss gas detection units, types GD Basic and Basic+ Electrical connection JP5* Open:44-20mA Open: – 20mA 5 GND Closed:22-10V Closed: – 10V 4 AO_01 X8 4 3 Bus_A 2 Status StatusLED LED Green/Yellow/Red Green/Yellow/Red 0 V AC/DC 24 V AC/DC Jumper Jumper J1 J2 J3 Danfoss 148H119_11-2018 X9 Service Tool X2 Buzzer Buzzer && 3-light 3-light alarm alarm Sensor Sensor Status LED: Ackn. -/Test button: GREEN is power on.
PAGE 6
Data sheet | Danfoss gas detection units, types GD Basic and Basic+ 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 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. The max. recommended loop wire length is 900 meter (2953 ft) per segment.
PAGE 7
Data sheet | Danfoss gas detection units, types GD Basic and Basic+ • • • • Cable gland not mounted but enclosed 4 mounting ears included Sensor head mounted bottom right Alarm device (Buzzer & Light) mounted bottom left (only Basic +) Danfoss 148H132_01-2018 General information Basic Basic + Sensor Sensor Gas types and thresholds Sensor Sensor Sensor Sensor Type ppm range Alarm 1 Alarm 2 Hysteresis Ammonia EC 100 Electrochemical 0-100 25 ppm 35 ppm 2 ppm Ammonia EC 300 Electrochemical
PAGE 8
Data sheet | Danfoss gas detection units, types GD Basic and Basic+ WAO Buzzer & & light light Blinking (2 (2 sec.) sec.) Blinking Housing Housing Fast blinking (1 sec.) Fast blinking sec.) Sensor Sensor Very fast blinking blinking(0.1 (0.1 sec.) sec.) Very Buzzer Buzzer on Buzzer & Buzzer & 3-light alarm 3-light alarm Danfoss 148H158_03-2018 Alarm scheme Static, Static, Power Power LED LED ackn. button button IfIf ackn. pressed pressedafter after Alarm Alarm Ackn. Ackn. ackn.
PAGE 9
Data sheet | Danfoss gas detection units, types GD Basic and Basic+ Ordering Type GDA GDHF Model Refrigerant Sensor ppm range Alarm ppm Temp. Range [°C] Temp.
PAGE 10
Accessories overview Controller unit Used for a centralized monitoring and warning. The input signals for the controller are collected via RS485 Modbus or analog communication. The controller can handle up to 96 digital sensors via Fieldbus and four (4) analog input. An additional 28 analog input is possible using seven (7) expansion modules (4-20 mA signal interface). The total number of connected sensors should not exceed 128 sensors.