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Summary of Contents for CTI SD2-NH3
- Page 1 SD2-NH3 SAMPLE-DRAW AMMONIA SENSOR FOR CONTROLLED ATMOSPHERE ROOMS Installation and Operation Manual...
- Page 2 SD2-NH3 Warning Use this product only in the manner described in this manual. If the equipment is used in a manner not specified by Calibration Technologies, the protection provided by the equipment may be impaired. This equipment should be installed by qualified personnel.
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Page 3: Table Of Contents
SD2-NH3 Table of Contents General description ......4 Installation ........4 Locating the SD1-NH3 . -
Page 4: General Description
(see Figure 1 on next page). The SD2-NH3 has a 10-minute sampling rate, and the sample-draw cycle is The fresh air port is located on the bottom the SD2-NH3 enclosure. This will as follows: be the source of fresh air necessary for proper monitoring and longer cell 2-minute sample time from the room being monitored. -
Page 5: Fresh Air Port Installation
SD2-NH3 Installing the Sample Air Port If the SD2-NH3 is mounted as recommended on an wall outside of the CA room, attach the sample air port, tubing and hardware as follows: (see Figure 1) Drill 1/2" hole through the exterior wall approximately 4" below the sensor enclosure. -
Page 6: Wiring
SD2-NH3 Wiring Electrical wiring must comply with all applicable codes. Electrical Power: 24 VDC regulated, 600mA. Output: Linear 4/20 mA output. Monitoring equipment may have a maximum input impedance of 700 ohms. Cable Recommendation: 18/3 shielded, stranded cable (General Cable C2535A or equivalent). -
Page 7: Operation
(see Figure 3). 2. Be sure the unit is in clean air. Once the unit is powered up, the SD2-NH3 starts the 10-minute sampling 3. Adjust the zero pot on the bottom back board until the sensor outputs rate, and the sample-draw cycle is as follows: 40 mV from Test [-] to Test [+] (see Figure 3). - Page 8 SD2-NH3 Figure 3 Top sensor board: Fault (red) LED: • On steady if supply voltage is less than 10VDC. Status (amber) LED: • Blinks once per second if RFI is detected. Gas sensing element Power (green) LED: • On steady to Indicate Power.
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Page 9: Maintenance
When the cell becomes depleted, a replacement cell can be obtained from verified. Keep an operation log of all maintenance and calibrations. CTI. Simply unplug the cell's ribbon cable from the transmitter, pull the old cell from the aluminum sensor housing, discard the old cell and replace with Inspect the filters periodically - every six months or when the room is a new one. -
Page 10: Specifications
SD2-NH3 Specifications Input Power: +24 VDC, 600mA Detection Principle: Electrochemical Detection Method: Sample-draw Gases: Ammonia (NH3) Ranges: 0/50 Output Signal: Linear 4/20 mA (max input impedance: 700 Ohms) Response Time: New sample every ten minutes Accuracy: +/- 5% of full-scale, but dependent on calibration gas accuracy and time since last calibration Zero Drift: Less than 0.1% of full-scale per month, non-cumulative... -
Page 11: Warranty
CTI until receipt by the buyer of shipping instructions from CTI; and c) the right of CTI to require that the buyer provide proof of purchase such as the original invoice, bill of sale or packing slip to establish that the product is within the warranty period. - Page 12 SD2-NH3-DOC1-2 20200923 ctiengineering.com | 866-394-5861...
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