GD-K77D Detector Head
Features
- Digital display with LCD back light
- Sensor information and calibration is stored within sensor memory
- Several data transmission options available
- Zero suppression and correction
- Smaller housing design for narrow wall mounting locations
- Self-diagnostic functions by microprocessor
- Electrochemical sensors for most semiconductor gases
- Built-in sampling pump
- Easy replacement of pump and sensor
- Two alarm levels, plus trouble alarm with relays
- 24VDC operation
- Optional NEMA 4X housing available
Applications
- Semiconductor
- Chemical Processing
- Laboratory
- Manufacturing
| The GD-K77D is a complete sample drawing gas monitor, including digital readout and alarm relays. A new gas sensor technology using an intelligent sensor for remote location calibration and setup is used. The new GD-K77D sensors are designed to provide a longer time period between calibrations. Calibration intervals have been cut in half to12 months of on-line service which equates to reduced maintenance cost. In addition, the sensors can be calibrated away from the gas detector installation, for example in a service area or offsite. This eliminates the inconvenience of having calibration gases in the fab or monitoring location. GD-K77D easily connects to an existing PLC system and is ideal for applications needing a local readout or where a relay control is needed. |
| Detection Principle | Electrochemical cell |
| Detection Method | Sample drawing type |
| Signal Transmission |
Analog transmission (4-20 mA) Two wire digital transmission |
| Display | Digital LED display of gas concentration, 4 digits |
| Gas Alarms | Two alarm levels: 1st alarm (Yellow LED), 2nd alarm (Red LED) |
| Dry Outputs For Remote Alarms |
Dry contact relay for 1st, 2nd, and trouble alarms (Normally Open or Normally Closed) |
| Alarm Response Time | Approximately 10 - 15 seconds when exposed to gas concentration of 1.6 times alarm level for most gases (Same as T60) |
| Self Diagnosistic Function |
Trouble, low flow, system failure, communication error |
| Operating Conditions | 0 - 40•C, 30 - 85% R. H. |
| Power Requirements | 24 VDC |
| Applicable Cable | Shielded cable 3C, 1.25 sq (18 gauge) Shielded twisted one pair cable, 1.25 sq (18 gauge) |
| Enclosure | Wall mounting |
| Dimensions | 2.8" (W) x 6.7" (H) x 6.0" (D), approximately
4.4 lbs 70 mm (W) x 170 mm (H) x 153 mm (D), approximately 2 kg |
Partial List Of Detectable Gases
Many other gases or ranges available.
Ammonia (NH3) |
0 - 75.0 ppm |
| Arsine (AsH3 ) | 0 - 0.20 ppm |
| Boron Trichloride (BCl3) | 0 - 15.0 ppm |
| Carbon Monoxide (CO) | 0 - 300 ppm |
| Chlorine (Cl2) | 0 - 3.0 ppm |
| Chlorine Dioxide (ClO2) | 0 - 1.00 ppm |
| Chlorine Trifluoride (ClF3) | 0 - 0.6 ppm |
| Combustibles | 0 -100% LEL |
| Diborane (B2H6) | 0 - 0.30 ppm |
| Fluorine (F2) | 0 - 6.0 ppm |
| Hydrogen (H2) | 0 - 2000 ppm |
| Hydrogen Chloride (HCl) | 0 - 15.0 ppm |
| Hydrogen Fluoride (HF) | 0 - 9.0 ppm |
| Hydrogen Sulfide (H2S) | 0 -100.0 ppm |
| Nitric Oxide (NO) | 0 -100.0 ppm |
| Nitrogen Dioxide (NO2) | 0 - 15.0 ppm |
| Oxygen (O2) | 0 - 25.0 % |
| Ozone (O3) | 0 - 1.0 ppm |
| Phosphine (PH3) | 0 - 1.0 ppm |
| Silane (SiH4) | 0 - 15.0 ppm |
| Sulfur Dioxide (SO2) | 0 - 30.0 ppm |