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MAKING MODERN LIVING POSSIBLE

Technical brochure

Gas Detection Sensor

GDA, GDC, GDHC, GDHF, GDH

Danfoss Gas Detection program, type GD

is a range of products designed to meet all

industrial refrigeration and air conditioning

applications.

GD detects a wide range of commonly used

refrigerants including Ammonia, Carbon

Dioxide, Halocarbons and Hydrocarbons.

GD sensors incorporate an interchangeable

precalibrated sensor board, which makes it

very easy to replace the sensor when service

or calibration is required.

The GD products feature reliable, real time

continuous monitoring. No blocked ﬁlters,

tubes or technical / maintenance problems

experienced by air sampling/aspirated

systems.

Features GD is speciﬁcally developed for refrigeration

applications.

Interchangeable precalibrated sensor board

means reduced costs of recalibration and

maintenance.

Optional models: LCD display, IP 65 models,

EExd (Explosion Protected), EExd Low

temperature, Models with remote sensor,

Models with remote EExd sensor, Models with

remote display, Models for Low temperature

down to –40°C (–40°F).

Can operate as stand alone product.

Linear analog outputs, current (mA) / volt (V)

proportional to the gas concentration.

Two digital outputs. Low Level and High Level

Alarm.

Optional NO or NC and diﬀerent delay setting

for both Low and High Alarm Level.

Manual or Auto reset optional.

Low and High Alarm levels and delays setting,

can be changed by the user.

GD can be connected directly to a Danfoss

m2, Micromon or AK-SM 350 monitoring unit.

Available with a range of diﬀerent sensor

technologies to monitor industrial

refrigeration gases:

– Electro-Chemical (EC)

– Semi-Conductor (SC)

– Catalytic (CT)

– Infra-Red (IR)

Calibration Certiﬁcates available.

Summary of content (16 pages)

PAGE 1
MAKING MODERN LIVING POSSIBLE Technical brochure Gas Detection Sensor GDA, GDC, GDHC, GDHF, GDH Danfoss Gas Detection program, type GD is a range of products designed to meet all industrial refrigeration and air conditioning applications. GD detects a wide range of commonly used refrigerants including Ammonia, Carbon Dioxide, Halocarbons and Hydrocarbons.
PAGE 2
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH Contents Page Features........................................................................................................................................................................................ 1 Technical data............................................................................................................................................................................ 3 Electrical connection.......................................
PAGE 3
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH Technical data Refrigerants - [ppm] range: Ammonia (R 717) Type GDA: – 0-100 ppm – 0-300 ppm – 0-1,000 ppm – 0-10,000 ppm – 0-30,000 ppm HFC ( R134A) Type GDHF-R3 – 0-1,000 ppm Carbon Dioxide (R 744) Type GDC 0-10,000 ppm 0-20000 ppm 0-40000 ppm Reference temperature conditions for factory calibration: Ambient temperature For increased accuracy the unit must be calibrated at the temperature of operation.
PAGE 4
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH Cable connection 1 gland for 6-13 mm cable (0.2”-0.5”) 1 Ø 20 mm (0.8”) hole with blanking plug. 1 extra gland can be fitted (only Standard, LCD display, IP 65 and EExd). Approvals CE: EN55011: 1998, EN61326: 1996 Following the provisions of 89/336/EEC, EMC Directives and, Cenelec EN61010-2 : 2001 Following the provisions of 73/23/EEC, Low ATEX for EExd model: Directive 94/9/EC Group 2, Category2, G and D, Zones 1 and 2.
PAGE 5
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH Design The GD product range is designed in a very flexible way with a mother PCB (Print Circuit Board) and an interchangeable precalibrated sensor PCB. The mother PCB is the same for all GD models independent of the refrigerant or sensor technology. On the mother PCB individual settings (Alarm levels, delays e.t.c) can be set to meet local legislation or application requirements.
PAGE 6
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH Sensor technology Danfoss has, depending on actual ppm range and refrigerant, selected the most appropriate sensor for the target refrigerant gas. When the refrigerant and actual ppm range has been decided, the Danfoss GD product range makes it easy to pick out the right product. Electrochemical Sensors - EC EC sensors are used mainly for toxic gases and are suitable for ammonia but not for the other refrigerants.
PAGE 7
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH A Bump Test consists of exposing the sensor to a gas. The objective is to establish if the sensor is reacting to the gas and all the sensor outputs are working correctly. A qualified bump test is a test carried out using ampoules or similar of known concentration.
PAGE 8
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH Functions - all models All GD models shown above have the same basic functions. All settings are done by means of jumper settings on the mother PCB. See the section “Mother PCB” for more details. For detailed information on how to adjust Alarm setting - please see the instruction PI.S00.A. Alarm All GD models can detect 2 alarm levels and give alarm via 2 volt free contacts.
PAGE 9
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH Mother PCB © Danfoss A/S (RC-MDP/MWA), 2014-04 DKRCI.PD.S00.A4.
PAGE 10
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH Mother PCB (Continued) GD connected to Danfoss monitoring Danfoss offers the possibility of connecting every GD, independent of model, via the built-in RS 485 Bus communication, directly to the Danfoss monitoring unit. Up to 31 GD sensors can be connected via a twocore screened communication cable (see the below drawing). Every GD sensor needs a unique address number which must be selected. The address of GD is set by S2 and S3.
PAGE 11
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH GD connected to Danfoss monitoring (Continued) Reference material Channel on Danfoss Monitoring System S3 S2 Channel on Danfoss Monitoring System S3 S2 Channel on Danfoss Monitoring System S3 S2 1 0 1 34 2 2 67 4 3 2 0 2 35 2 3 68 4 4 3 0 3 36 2 4 69 4 5 4 0 4 37 2 5 70 4 6 5 0 5 38 2 6 71 4 7 6 0 6 39 2 7 72 4 8 7 0 7 40 2 8 73 4 9 8 0 8 41 2 9 74 4 A 9 0 9 42 2 A 75
PAGE 12
Danfoss Type DKRCI.PD.S00.A4.
PAGE 13
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH Ordering - GD sensor PCB Ordering - GD upgrade kits Description Code No.
PAGE 14
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH Ordering - Accessories Description Code No. GD Test Kit - GD Tester all models. To test mother PCB at Sensor PCB replacement - Beaker M42 - EC/SC/CT-Adapter. Fit Beaker M42 - M35 Adapter. Fit Beaker M42 148H5230 GD Repeater all models.
PAGE 15
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH Dimensions Standard LCD display IP 65 with stainless steel sensor head EExd EExd Low Temperature 122 122 168 Danfoss M148D0004_1 152 75 7 14 Mounting Holes 2 x Clearance for M6 IP 65 Enclosure © Danfoss A/S (RC-MDP/MWA), 2014-04 DKRCI.PD.S00.A4.
PAGE 16
Gas Detection Sensor, type GDA, GDC, GDHC, GDHF, GDH Dimensions (Continued) IP 66 enclosure 5 m remote IP 65 sensor IP 66 enclosure 5 m remote IP 65 EExd sensor Remote LCD display IP 41 EExd for CO2 www.danfoss.com/ir 16 DKRCI.PD.S00.A4.