OWNER’S MANUAL Indoor Air Quality Meter Model IAQ50
LIMITATION OF WARRANTY AND LIABILITY Seller warrants the goods sold hereunder, under normal use and service as described in the operator's manual, shall be free from defects in workmanship and material for twenty-four (24) months, or the length of time specified in the operator's manual, from the date of shipment to the customer. This warranty period is inclusive of any statutory warranty. This limited warranty is subject to the following exclusions: a.
Table of Contents LIMITATION OF WARRANTY AND LIABILITY................................................................... ii SECTION 1 General Description.................................5 SECTION 2 Safety...........................................................6 SECTION 3 Setting-Up ..................................................7 Supplying Power to the Model IAQ50 .....................7 Installing the Batteries.................................................7 Using the Optional AC Adapter...........
SECTION 5 Maintenance ............................................ 26 Probe Tip..................................................................... 26 Cases ............................................................................ 27 Storage......................................................................... 27 SECTION 6 Service and Calibration ........................ 27 Factory Calibration.................................................... 28 Field Calibration ...................................
SECTION 1 General Description The Model IAQ50 measures Carbon Dioxide (CO2) level, temperature and relative humidity, and calculates dew point and wet bulb. It also calculates the percentage of outside (make up) air in a given indoor space, using CO2 levels, or temperature. The instrument will determine statistics and recall individual data points for up to 255 test IDs. The Model IAQ50 will retain data even after it is turned off.
SECTION 2 Safety When using the IAQ50 to check for CO2, temperature or humidity values, make certain that you can safely raise and hold the instrument while making measurements. Be especially careful when working on a ladder. Observe all necessary precautions so that the unit does not become caught in moving machinery or touch any exposed electrical wiring. DANGER! Use with corrosive or other dangerous or explosive gas mixtures is not recommended.
SECTION 3 Setting-Up Supplying Power to the Model IAQ50 The Model IAQ50 can be powered in one of two ways: four AA-size batteries or an optional AC adapter. Installing the Batteries Insert four AA batteries as indicated by the diagram located on the inside of the battery compartment. The Model IAQ50 is designed to operate only with alkaline batteries, which are included. At 15% battery life remaining, the battery indicator will show that the batteries need to be changed.
Start up Sequence for the Model IAQ50 When the instrument is turned on, all segments of the display will light up and then the meter goes through a start-up sequence. Battery Percentage This shows the remaining amount of battery power. Log Percentage This shows how much of the datalogging memory is still available. Baud Rate The Model IAQ50 has a DEFAULT baud rate of 1200, which allows it to communicate with the optional portable MicroPrinter.
and time stamping of recorded data will not be correct. To set the time and date, press and hold either 5 or 6 key during the power-up sequence when the time is displayed. Release the keys when the Model IAQ50 beeps twice. You will have an opportunity to view and/or change the minutes (min), hours, year, month and date in sequence. Use the 5 or 6 key to change any settings. Use the ENTER key to store each setting and advance to the next one. Barometric Pressure The default barometric pressure is 29.92.
sequence, press and hold the ENTER key at any point of the start-up sequence, until the meter beeps. Using the Sensing Probe The sensing probe relies on the diffusion of air. For best results, try to keep the sensing probe surrounded by moving air. Do not breathe on the probe, since humans exhale levels well exceeding 10,000 ppm CO2 and it may take time for the probe to re-stabilize.
ON/OFF Key Press the ON/OFF key to turn the instrument on and off. When the instrument is first turned on, it goes through a preprogrammed power-up sequence that includes an internal self-check (when all displayable items are shown). The Model IAQ50 begins by displaying percentage of battery life remaining (accurate for alkaline batteries only), the percentage of memory available, baud rate, time (HH.MM) and entered barometric pressure.
rameter, press the CO2 key. Then, place the probe in the location you want to measure gas concentration. TEMP Key The meter will always display temperature readings from the permanent sensor on the lower line of the display. When you wish to take an external temperature reading using an RTD probe, plug any three-pronged RTD probe into the right side. Then, press the TEMP key to view the temperature from the resistive temperature detector (RTD).
HUMID Key Press HUMID to toggle between %RH, dew point or wet bulb, (as displayed on the top line of the display). Dew point and wet bulb are displayed in the same units chosen for temperature measurement. READ/ENTER Key This is a dual function key. It reads measurement samples and it can be used to accept a value or condition or to return to regular measuring mode. Press READ to take a sample reading; the instrument takes a measurement over five seconds.
TIME LOG Key To set up the instrument so it automatically takes measurements, use the TIME LOG key. This allows you to program a logging time and interval, and the meter will read and store measurements that can be viewed later. Press the TIME LOG key. Use the 5 or 6 keys to select “On”. Press the ENTER key. “LOG” will light up on the display and the logging interval is shown. Use the 5 or 6 keys to scroll through the log interval choices.
sen, the instrument will sample continuously until it is either stopped manually, runs out of memory, or the batteries run out. If a number between 1 and 9999 is chosen, the instrument will take that number of samples and then stop storing readings. The instrument will then return to a normal measuring mode. Press ENTER to start the automatic time log. LOG will flash on the display while this function is running. You need to press ENTER to stop the logging function if it was set for “COnt”.
NEXT TEST Key Press NEXT TEST to advance to the next test ID. If the current test ID does not have anything stored, it will not advance to the next test ID. The Model IAQ50 will automatically increment the test ID number under the following conditions: • turning off the Model IAQ50 (if there is stored data) • setting any data logging sample • taking a %OA measurement after a normal sample • taking a normal sample after a %OA measurement.
Using CO2: %OA= (CR–CS) / (CR–CO) x 100% where %OA = Percentage of outside air = Concentration CO2 of CR return air = Concentration CO2 of CS supply air CO = Concentration CO2 of outside air Using Temperature: %OA= (TR-TS) / (TR-TO) x 100% where %OA = Percentage of outside air TR = Temperature of return air TS = Temperature of supply air TO = Temperature of outside air 17
IMPORTANT: Temperature readings should be taken at the Air Handling Unit only, since there may be components in the system that change the temperature that are not evident upon initial examination. Calculating Outside Air measurements by taking readings at the supply air to a room will not give the correct answer. Reheat coils and chiller coils will change the temperature of the readings and give incorrect answers.
Details on the procedure are as follows: Press the %OA key once to begin. To choose a measurement mode (OA, SUPPLY, RETURN), use the 5 or 6 keys. You may press TEMP or CO2 at any time to move from calculating %OA from TEMP to CO2 or from CO2 to TEMP. In return air mode, “RETURN” will appear on the display. The current value will show on the bottom line of the display.
If the measurement is not acceptable or the value is not yet stable, wait a minute and then take another reading to overwrite the value on the top line. Once the top line value is acceptable, press the 5 or 6 keys to move the icon to either Supply or %OA, whichever reading you are prepared to make next. Repeat the procedure with both a Supply measurement and an Outside Air measurement. Remember, the top line measurement is what will be used in the calculation.
Note: “Err” will display if not enough information is available or a negative % value is calculated. To make changes to one of the other three readings without putting these values to memory yet, press the 5 or 6 keys to review the values and press READ/ENTER to overwrite the value. To exit this procedure completely without putting any values to memory, press NEXT TEST. To take another % outside air measurement, make sure you pressed READ/ENTER to put the values to memory.
to change the value. Press ENTER to return to normal measuring mode. RECALL Key The RECALL key lets you review data from a particular test ID. Press the RECALL key. The most current test ID number will show on the display. Press ENTER to review measurements in this test ID, or use the 5 or 6 keys to choose another test ID to review. If dashes appear in the top line of the display, there is no stored data in that particular test ID.
ments, press the desired measurement button. For example, if you wish to see humidity measurements, press HUMID. Press HUMID again to see dew point readings. For the external RTD, press the TEMP key. If there is no data for that measurement type “-----” will be displayed. Press another measurement key to view more data or press ENTER to return to measuring mode. Note: To view return air, supply air or outside air data individually, you must download to computer or print out the values.
them. Use the 5 or 6 key to adjust the value, and press ENTER to accept. DEL Key The Model IAQ50 lets you clear the last sample stored or the entire contents of memory. To clear only the last sample, hold the DEL key and the display will begin a countdown from 3 to 0. Release the key before 0 is displayed. The display will beep twice and flash ”CLEAR SAMPLE.” To clear all memory, press and hold the DEL key and the display will begin a countdown from 3 to 0. Release the key while 0 is displayed.
Printing Data Using the Optional MicroPrinter If the optional MicroPrinter is connected, what is viewed on-screen will be on the paper printout. Note: In order to print, the baud rate on the Model IAQ50 must be set to the same as the printer. The default is 1200. The data will print in a format such as 12,345.67. If you desire, the Model IAQ50 can print in a format such as 12.345,67 by switching DIP switch #8 ON. See “DIP Switch Settings” in Chapter 8.
printer, please refer to the operation and service manual for the printer to properly set the printer’s DIP switch settings. If the printer prints question marks (??????), asterisks (******), or random characters, reset it by turning it off and then on again. If necessary, refer to the Owner’s Manual for the MicroPrinter. SECTION 5 Maintenance Probe Tip Periodically inspect the probe tip to ensure that it is clean. Dust and oil deposits on the sensor may affect the response time of the Model IAQ50.
Cases If the instrument case or storage case needs cleaning, wipe it off with a soft cloth. Never submerge the Model IAQ50 in any liquid. Storage When storing the Model IAQ50 for more than a month, TSI recommends removing the batteries. This prevents possible damage due to battery leakage. SECTION 6 Service and Calibration Please return your Product Registration Card immediately. This allows us to send service reminders, special offers, and important information about your product.
calibration, Return Material Authorization (RMA) number, and shipping instructions. Please have the following information available when you call: • Owner’s name, address, and phone number • Billing address, if different and applicable • Instrument name and model • Serial number • Date of purchase • Where purchased TSI recommends that you keep a “calibration log” and keep all records of service on your instrument.
especially important in applications where strict calibration records must be maintained. Send the instrument to TSI Instruments Ltd. prepaid. Securely package your instrument in a strong container surrounded by at least 5 cm of suitable shockabsorbing material. Include a purchase order that clearly shows the instrument model number and serial number, a contact name, phone, fax number, and RMA number. Mark the outside of your shipping container with the RMA number.
3. 4. 5. 6. 7. 8. 30 Turn the IAQ50 on. It will flash “CAL” on the top row and beep intermittently. Press and hold the CO2 key to begin the calibration procedure. The display will begin a countdown from 5 to 0. Release the key when the display reads 0. If the key is released too soon or too late, the instrument will go back to beeping and flashing “CAL”. If you’ve done this step correctly, “ZerO” will appear on the display and the beeping will have stopped.
9. 10. 11. 12. 13. 14. the display indicates “SPAN” and the span concentration. Install the regulator on the span calibration cylinder and connect tubing from the regulator to the inlet fitting on the calibration collar. Use 5 and 6 keys to adjust the concentration displayed on the IAQ50 to match the concentration on the span gas cylinder. Press and release the READ key to take a span gas reading. The IAQ50 starts a 60 second countdown.
Temperature and Humidity Calibrations Adjustment Procedure The temperature adjustment can add or subtract a number of degrees. The range is ±9.99ºF (±5.55°C). Calibration can be done in either ºF or ºC mode. Humidity adjustment adds or subtracts a constant percentage. The range is ±12.0% relative humidity. The procedure for field adjustment is as follows: Turn off the instrument, flip DIP switch #7 to “ON.” Turn the Model IAQ50 on again.
it. When finished, turn the instrument off and flip DIP switch #7 to “off.” On the Model IAQ50, press and hold the TEMP or HUMIDITY key to enter the calibration mode for that parameter. To enter the calibration mode for the RTD, make sure the RTD is plugged in. Press the TEMP key until “Prb” shows on the display, then press and hold the TEMP key. The display will begin a countdown from 5 to 0. Release the key when 0 is displayed.
SECTION 7 Troubleshooting Table 7-1 lists the symptoms, possible causes, and recommended solutions for common problems encountered with the Model IAQ50. If your symptom is not listed, or if none of the corrective actions solve your problem, please contact TSI Instruments Ltd.
Symptom Display reads "LO" Possible Causes Wrong AC adapter Low AC line voltage Dirty battery contacts Display reads “CAL” Display reads “OVER” The Model IAQ50 has detected an internal fault A parameter value is too high. Temp. initially reads high or low RTD became unplugged while reading RTD temperature. Temperature sensor is still adjusting to temperature Corrective Action Replace with the correct AC adapter. Correct the AC line voltage or use batteries. Clean the battery contacts.
Symptom Display reads “LOG FULL” Display flashes “Libatt” Possible Causes You are trying to enter more readings than memory can handle Low lithium battery power Corrective Action Read or record the average; clear the sample register and proceed. Return to factory for replacement. SECTION 8 DIP Switch Settings To access the DIP switches, remove the batteries from the battery compartment. On the inside of the battery compartment, there is a window with eight DIP switches.
Table 8-1: DIP Switch Settings Switch 1-3 4 5 6 7 8 OFF Must be OFF Not assigned °F Buzzer OFF Normal Mode American Date Format and 12,345.67 ON ------------°C Buzzer ON Calibrate Mode European Date Format and 12.345,67 The ON position is away from the batteries and OFF is towards the batteries. Always leave DIP switch #1–4 in the OFF position.
Specifications Specifications are subject to change without notice. CO2 Range: Accuracy:1 Resolution: Sensor Type Temperature: Range: Accuracy: Resolution: 0 to 5000 ppm ±3% of reading at 25oC or ± 50 ppm, whichever is greater 1 ppm Dual wavelength NDIR (Non-dispersive Infrared) 0 to 60°C ± 0.6°C 0.1°C Secondary Temperature Probe (optional): Range: -40 to 120°C Accuracy: ±0.6°C Resolution: 0.
Wet Bulb: Range: Resolution: 5 to 60°C 0.1°C % Outside Air: Range: Resolution: 0 to 100% 0.1% Logging Capability: Intervals: Up to 14,000 measurements in 1000 test ID’s 5,6,7,8,9,10,15,20,25, 30 sec. 1,2,3,4,5,6,7,8,9,10,15, 20,25,30,60 min. Meter Dimensions: 89 mm × 168 mm × 41 mm Weight (with batteries): 0.
TSI Instruments Ltd. Lancaster Road Cressex Business Park High Wycombe Buckinghamshire HP12 3QP England October 2005 Printed in USA Part No. 1980533, Rev. A Tel: +44 (0) 149 4 459200 Fax: +44 (0) 149 4 459700 E-mail: info@airflowinstruments.co.uk Web: www.airflowinstruments.co.
