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Danfoss gas detection units - Types GD Basic and Basic+ Data Sheet
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Danfoss gas detection units - Types GD Basic and Basic+ are designed for monitoring and warning of hazardous gas concentrations, commonly used refrigerants. They feature digital, factory-configured, and pre-calibrated gas detectors for plug-and-play installation, simplified operator handling, and minimized operational, settings, and calibration errors.
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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.
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 configure two individual alarm ranges. Alarm 1, a pre-alarm indicating the gas level has passed a predefined treshold 1, and - if the gas level passes predefined treshold 2 - the final alarm 2.
Features
© Danfoss | DCS (MWA) | 2018.09
• Digital, factory configured and pre-calibrated gas detectors for plug-and-play installation (no adjustment required)
• Easy configuration 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
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Data sheet | Danfoss gas detection units, types GD Basic and Basic+
Contents Page
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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). The Service tool (or PC tool) is plugged directly to the board of the unit. The interfaces allow the unit configuration, setting of the unit alarm levels and calibration of the attached sensor.
The service tool (or PC tool) can be used on all units across the Basic, Premium and Heavy Duty platforms.
The alarm signals can be handled by the
Gas Detection Controller (or a PLC) via the
4-20 mA (2-10V) analog output or the RS485 open Modbus communication. For additional operational safety the changing of parameters is password protected allowing authorized access only. The factory default password can easily be customized.
Service and maintenance The Basic/Basic+ gas detection units are calibrated either by replacing of sensor heads or by calibration with gas.
Plug & Play replacement sensors are precalibrated and factory certified for quick and easy calibration procedure. The sensor is connected to the local bus via a plug connection enabling easy and simple exchange of sensor instead of an on-site calibration. The internal X-change routine recognizes the exchanged sensor during the exchange process and restarts the measurement mode automatically. An LED indicates the correct procedure of the exchange operation. To ensure the proper functioning of the units and to prevent human errors, the sensor head can only be replaced by the same type and ppm range (exact replacement) that match the configuration. If a different sensor head is installed, the GD unit will show a communication error.
As an alternative, calibration with gas can be performed via the service tool (or PC tool), calibration gas with correct concentration and the Danfoss calibration adapter. The Danfoss gas detection units have an integrated, digital calibration interface and procedure, which makes the calibration process easy, accurate, and time-saving. No potentiometers or multi-meters required for the calibration. The calibration procedure requires significantly less calibration gas per calibration compared to traditional routines.
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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., overload, short-circuit and reverse-polarity protected
Serial interface
Local bus
Fieldbus
Tool bus
Analog output signal
Proportional, overload and short-circuit proof, load ≤ 500 Ohm
4 - 20 mA = measuring range
3.0 < 4 mA = underrange
> 20 - 21.2 mA = overrange
2.0 mA = fault
Status LED / Buzzer & light (only Basic+)
Colour
Acoustic pressure
Frequency
Protection class
1-wire / 19200 baud
RS 485 / 19200 baud
2-wire / 19200 baud
General
Temperature range
Humidity range
Storage temperature
Storage time
Physical
Housing
Material
Burning behaviour
Housing colour
Dimensions (W x H x D in mm)
Weight (kg)
Protection class
Installation
Cable entry
Wire connection:
Power supply, fieldbus
-30 °C to +50 °C (-22 °F to 122 °F)
15 - 90 % RH not-condensing
+5 °C to +30 °C (41 °F to 86 °F)
12 months
Type A
Polycarbonate
UL 94 V2
Black
94 x 130 x 57
Approx. 0.3kg (0.8 lbs.)
IP 65
Wall mounting
2 x M12 / 3 x M20
Analog output
Local bus for sensor
Cable lengths local bus for remote sensor board
Screw-type terminals 0.25 to 2.5 mm2
(25 AWG to 14 AWG)
Screw-type terminals 0.25 to 1.3 mm2
(25 AWG to 17 AWG)
3-pin plug connector
Max. 5 m (16.4 ft.)
Directives
EMC directives 2014/30/EU
CE
Conformity to EN 50271, EN 61010-1
ETL listed to UL 61010-1 and CSA C22.2 No.61010-1
Enables regulatory compliance with EN 378:2016, ISO 5149:2014, IIAR 2-2017, and ASHRAE 15:2016
3 color light: Green, yellow, red
> 85 dB (A) (0.1 m distance)
2300 Hz
IP 65
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Data sheet | Danfoss gas detection units, types GD Basic and Basic+
Electrical connection
JP4*
Open: 4-20mA
5
4
GND
AO_01
X1 Analog Output
Status LED
Green/Yellow/Red
Ackn. -/Test button T1
X9
Service Tool
Jumper
J1
J2
J3
0 V DC
24 V DC
Buzzer &
3-light alarm
Status LED:
GREEN is power on.
- flashing if maintenance needed
YELLOW is an indicator of Error.
- when the sensor head is disconnected or not
the expected type
- AO is activated but nothing connected
- flashing when sensor is in special mode
(e.g. when changing parameters)
RED on alarm, similar to the buzzer & light alarm.
Ackn. -/Test button:
TEST - The button must be pressed for 20 sec.
- Alarm1 and Alarm2 is simulated, stop on
release
ACKN. - Pressed while Alarm2, the audible warning switches off and goes back on after
5 min. when the alarm situation is still active.
* JP4 open → AO 4-20 mA (Default)
JP4 closed → AO 2-10 Volt
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Data sheet | Danfoss gas detection units, types GD Basic and Basic+
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 figure shows how to make proper connections between the controller and each
GDU.
560 R
2
1
4
3
2
1
4
3
Controller unit
0 V DC
24 V DC
BUS_B
BUS_A
0 V DC
24 V DC
2
1
4
3
2
1
4
3
2
1
4
3
U min
= 16 V DC
Controller unit
R
Wire length max. 900 meter (2953 ft) per segment.
Additional power limitations must be calculated.
R
R
R
Controller unit
R
Danfoss
148H123_03-2018
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Data sheet | Danfoss gas detection units, types GD Basic and Basic+
General information • Cable gland not mounted but enclosed
• 4 mounting ears included
• Sensor head mounted bottom right
• Alarm device (Buzzer & Light) mounted bottom left (only Basic +)
Basic Basic +
Gas types and thresholds
Sensor
Ammonia EC 100
Ammonia EC 300
Sensor Type
Electrochemical
Electrochemical ppm range
0-100
0-300
Ammonia EC 1000
Ammonia SC 1000
HFC R404A, R507 SC2000
Electrochemical
Semiconductor
Semiconductor
0-1000
0-1000
0-2000
Hysteresis = 5% of Alarm1 (rounded up to the next higher integer)
Alarm 1
25 ppm
25 ppm
500 ppm
500 ppm
500 ppm
Alarm 2
35 ppm
150 ppm
900 ppm
900 ppm
900 ppm
Hysteresis
2 ppm
2 ppm
25 ppm
25 ppm
25 ppm
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Data sheet | Danfoss gas detection units, types GD Basic and Basic+
Alarm scheme
WAO
Buzzer &
3-light alarm
Very fast blinking (0.1 sec.)
Buzzer on
If ackn. button pressed after Alarm
If ackn. button pressed during Alarm2
If ackn. button not pressed
Time delay*
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Data sheet | Danfoss gas detection units, types GD Basic and Basic+
Ordering
Spare parts and accessories
Type
GDA
GDHF
Model
Basic
Basic+*
Basic
Basic+*
Basic
Basic+*
Basic
Basic+*
Basic
Basic+*
* incl buzzer & Light
Refrigerant
Ammonia
Ammonia
Ammonia
Ammonia
Ammonia
Ammonia
Ammonia
Ammonia
R404a, R507a,
R32, R125, R407c,
R434a, R488a,
R125
R404a, R507a,
R32, R125, R407c,
R434a, R488a,
R125
Sensor
Electrochemical
Electrochemical
Electrochemical
Electrochemical ppm range
0-100
0-100
0-300
0-300
Electrochemical 0-1000
Electrochemical 0-1000
Semiconductor 0-1000
Semiconductor
Semiconductor
0-1000
0-2000
Semiconductor 0-2000
Alarm ppm
25/35
25/35
25/150
25/150
500/900
500/900
500/900
500/900
500/900
Temp. Range
[°C]
-30 to +50
-30 to +50
-30 to +50
-30 to +50
-30 to +50
-30 to +50
-10 to +50
-10 to +50
-10 to +50
Temp. Range
[°F]
-22 to 122
-22 to 122
-22 to 122
-22 to 122
-22 to 122
-22 to 122
14 to 122
14 to 122
14 to 122
Code number
148H6000
148H6001
148H6008
148H6009
148H6014
148H6015
148H6023
148H6024
148H6045
500/900 -10 to +50 14 to 122 148H6046
Description
Replacement sensor - Ammonia EC 100
Replacement sensor - Ammonia EC 300
Replacement sensor - Ammonia EC 1000
Replacement sensor - Ammonia SC 1000
Replacement sensor - HFC R404A, R507 SC 2000
Controller unit
Controller solution (controller + enclosure)
Warning module (wire break monitoring module)
Controller expansion module
Service tool
PC tool
Calibration adapter
Buzzer & light - acoustic buzzer and optic led
Air duct set
Seal cap
Splash guard
Gateway for controller
Code number
148H6200
148H6201
148H6202
148H6203
148H6210
148H6231
148H6221
148H6223
148H6222
148H6224
148H6235
148H6232
148H6225
148H6236
148H6227
148H6226
148H6228
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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. The controller unit can be employed as pure analog controller, as analog/digital, or as digital controller. Configuration is menu-driven via the keypad. For fast and easy configuration, the PC
Tool is recommended.
Controller solution
Controller unit placed in an enclosure ready to be connected to a power source. A separate UPS for the controller is available.
Buzzer & light - acoustic buzzer and optic led
Can be installed in Basic or Premium units providing a local alarm.
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.
PC tool
The PC tool is a menu-driven and standalone software used for easy addressing, parameter setting, calibration, and data logging of the
Basic, Premium and Heavy Duty gas detection units, and the controller unit.
Calibration adapter
The calibration adapter is required for connecting the calibration gas container, via the flow regulator, to the sensor head on the gas detection units. (Two variants, One for Basic and
Premium plastic head sensors; one for heavy duty and Premium remote metal head sensors.).
Air duct set
The air duct set is specially designed to capture the airflow in air ducts. It can be connected to the standard sensor heads, except from Heavy
Duty gas detection units.
Seal cap
Airtight seal cap to protect the sensor head against premature exposure during installation.
The seal cap is mounted on new sensors
(complete units and replacement sensors) but is also available as an accessory.
Splash guard
To protect the sensor head against water exposure during wash-down cleaning and rinsing operations.
Service tool
For interface with units with no display (Basic,
Basic+, Premium, Premium+). Acts as a portable display and can be connected to all Danfoss gas detection units. (Heavy Duty w. adapter).
Gateway for controller
The gateway is an addition to the controller and used for communicating via Modbus TCP/IP.
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