Single Input Gas Detection Monitor AirTest Model CT-1000

Single,Input,Gas,Detection,Monitor,AirTest,Model,CT-1000CT-1000 - Single Input Monitor

The CT-1000 is a single input monitor for stand-alone applications. It can be supplied with an onboard Carbon Monoxide (CO), Combustible gas (Propane, Natural Gas), or Refrigerant (Halocarbon or Ammonia) solid-state sensor. In addition to a power light, low alarm light, and high alarm light, the monitor has two user settable alarm relays and a time delay.

For use as a single channel controller the CT-1000 can be supplied without an onboard sensor and factory configured to accept 2 or 3-wire 4-20 mA input signals. The CT-1000 has been used extensively with electrochemical Nitrogen Dioxide (NO2) sensors to detect diesel exhaust.

Specifications | Installation | Start-Up | Calibration | Dimensions | Wire Diagrams

Specifications

Sensing Element (onboard) Solid-state
Standard Range CO 0 TO 400ppm
LEL 0 TO 40%
NH(3) 0 TO 500ppm
Halocarbon 0 to 3000ppm
Sensing Element (remote) Electrochemical, solid-state, Catalytic Bead or Infrared.  Most manufacturers 2/3 wire 4-20 mA or voltage output.
Operating temperature -20°C to +50°C
-4°F to +122°F
Humidity (non-cond.) 5 to 90%
Enclosure Material Cast Aluminum
Weight 22 oz / 625 grams
Gas Sampling Method Diffusion
Warm-up Time 24 hours
Power requirement 115 VAC standard
4V DC / 24V230/24 VAC opt.
12-24 VDC opt.
Power consumption 2.5 VA Max
Relays - alarm 2 @5A 250 VAC
30 VDC
Relays - trip points Trimpot adjust
Relays - time delay setting 16 ON selections on alarm 1;2 min. intervals
Dimensions L x W x D (in) 9 x 3 x 2.3
Dimensions L x W x D (cm) 23 x 7.6 x 5.7

CO= Carbon Monoxide, NH(3) = Ammonia, LEL = Lower Explosive Limit of Combustible Gas, Halon - HCFC's, HFC's (R22, R134a, etc)
AirTest continues to work on product improvement, specifications are subject to change without notice.

Installation

  1. Separate the enclosure lid from the body. There is a connector on the lid wiring.
  2. Locate a flat surface to mount the enclosure so that the sensor can face downward.
  3. Mount the enclosure to the wall using the two mounting hole locations.
  4. There is a power entry location provided on the end opposite the sensor.
  5. Connect the electrical fittings to the enclosure and bring in the electrical wires. NOTE: BE SURE WIRING IS DONE ACCORDING TO THE LOCAL ELECTRICAL CODE REQUIREMENTS.
  6. Connect the wires to the removable connector blocks. Re-connect the enclosure lid.

Start-Up

  1. If the unit is a 115 VAC model apply power to AC HOT, AC NEUT & GND at TM1. If the unit is a 24 VAC model apply power to AC HOT & AC NEUT at TM1. The power LED will come on after about 5 seconds, as the sensor warms up. If the power LED does not come on, then either the sensor is faulty, not connected properly or there is no power to the sensor. The power LED is actually monitoring the sensor output and is looking for a minimum signal to be present.
  2. During the first minute all alarms will activate and then de-activate
  3. Wait 24 hours before attempting calibration of the unit. The relay connector may be disconnected during this time.

Calibration

SOLID STATE SENSORS:

The CT-1000 has been factory calibrated and is ready for use. If however there is a level of background gases, it should be calibrated on site. If the range is to be changed, the CT-1000 must be re-calibrated.

NOTE: Wait 24 hours prior to a cold start calibration. If the unit has been without power for less than 20 minutes, then only a 10-minute wait is required.

  1. Open the enclosure and let the lid hang so that the LED indicator lamps can be viewed. The lid can be removed by unplugging the LED indicator lamp connector and using the internal relay indicator lamps for calibration.
  2. Disconnect the relay connectors (TM2, TM3) so that motors and/or alarms are not being turned off and on during calibration.
  3. Set SW1, time delay setting for alarm 1, to 0 (zero).
  4. Turning the alarm adjustment potentiometers RV1 and RV2 clockwise will activate the alarm relays, turning counterclockwise will de-activate the alarm relays.
  5. Use a calibration flow rate of 0.2 LPM (0.4 SCFH). Apply the gas mixture through a humidifier for two minutes before adjusting the alarm point. Note: The calibration mixture must be AIR based not Nitrogen based.
  6. Through a humidifier (see Calibration Kit drawing), apply a test gas mixture to the sensor equal to the level required for the LOW alarm point. Adjust alarm 1 clockwise (RV1) so that the relay 1 LED comes on. (Yellow LED on front cover).
  7. Through a humidifier (see Calibration Kit drawing), apply a test gas mixture to the sensor equal to the level required for the HIGH alarm point. Adjust alarm 2 clockwise (RV2) so that the relay 2 LED comes on. (Red LED on front cover).
  8. Set time delay setting for alarm 1 to desired setting. (SW1). Each number increment adds approximately 2 minutes delay to the activation of the alarm 1 relay. NOTE: During this time delay (when activated), the indicator lamp for alarm 1 will flash.
  9. Connect the alarm relay connectors (if removed) also the LED connector (if removed) and install the enclosure lid.

Figure 1

Recommended humidifier arrangement to be used when calibrating solid-state sensors.

Dimensions

  1. Dimensional Information

Wire Diagrams

  1. CT-1000 Wiring Diagrams


Powerful Solutions for Instrumentation & Control Problems!

Single Input Gas Detection Monitor AirTest Model CT-1000

Site Designed By Panther Marketing