Gas Detection For Life

GD-K77D Series

• 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

• 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

0 - 75.0 ppm

Arsine (AsH₃ )

0 - 0.20 ppm

Boron Trichloride (BCl₃)

0 - 15.0 ppm

Carbon Dioxide (CO₂)

0 - 1.0 %

Carbon Monoxide (CO)

0 - 300 ppm

Chlorine (Cl₂)

0 - 3.0 ppm

Chlorine Dioxide (ClO₂)

0 - 1.00 ppm

Chlorine Trifluoride (ClF₃)

0 - 1.00 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

Nitrogen Trifluoride (NF₃)

0 - 30.0 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

TEOS (Si(OC₂H₅)₄)

0 -15/30 ppm