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Summary of Contents for DPM TT Series
- Page 1 TT Series Micromanometer OPTERATING MANUAL 570 Low Resolution ...
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Page 2: Table Of Contents
TT Series LR Manual CONTENTS Page 00 Limitations of Use Keypad Controls Mode of Operation Display Pressure Connections User Menu 05 ‐ 07 Option Menu 08 ‐ 10 Conversion Tables Duct Traverse Points Downloading Data Maintenance & Calibration Specifications ... -
Page 3: Limitations Of Use
TT Series LR Manual LIMITATIONS OF USE Page 01 TT Series instruments are intended for measurement of low differential air pressure in and around commercial and industrial air handling systems, and for use with a Pitot Static Tube. The instruments are not suitable for liquid pressure measurement, and must not be used with corrosive, toxic or otherwise hazardous gases. The instruments are not classified “Flameproof” or “Intrinsically Safe” and consequently must not be used where an explosion hazard may exist and are not authorised for Life Support applications. During normal operation small quantities of air (typically less than 0.1ml/min) may pass into or out of the system under test: it is the user’s responsibility to consider the consequences of such leakage before determining the suitability of the instrument for any particular purpose. The instrument must be turned off before it is stored or transported and if it is to be stored for a long period of time or is to be transported by air, the battery must be removed. There is a 12‐month guarantee on all manufactured parts. This guarantee does not cover any consumables, and /or wear and tear during normal or abnormal use. The guarantee becomes null and void if the instruments parts have been tampered with, misused, abused or used outside the parameters set out in the manual. The manufacturer will determine if the instrument is repairable or requires replacement; charges may apply. ... -
Page 4: Keypad Controls
TT Series STD Manual KEYPAD CONTROLS Page 02 ENABLE Protects against accidental switching ‘on’ and ‘off’ of the instruments power source. ON Used in conjunction with ENABLE to switch on the instrument. OFF Used in conjunction with ENABLE to switch off the instrument. FAST Smoothes out the response to applied pressure changes. Time constant: SLOW Fast = 0 sec Slow1 = 5 sec Slow2 = 10 sec Slow3 = 15 sec Slow4 = 20 sec UNITS Changes the unit of measurement. The units are arranged in loop formation as follows (model dependent): Kpa → mmH O → inH O → mbar → m/sec → ft/min → Kpa STORE Stores readings manually. ... -
Page 5: Mode Of Operation
TT Series LR Manual MODE OF OPERATION Page 03 On / Off: Press and hold ENABLE then press ON or OFF as appropriate. Auto Zero: The cycle will begin as soon as the instrument is switched on. This is factory set at a 30 second interval upon switch on and thereafter at 60 second intervals. To change this timing see User Menu page 05. The instrument contains a miniature solenoid valve, which isolates the pressure sensors during auto zero. The valve emits two clearly audible clicks, which signal the start and end of the auto zero process. Battery Low: The battery condition is monitored every time the instrument auto zeroes. When the ‘battery low’ warning appears, the battery must be replaced immediately, otherwise the readings obtained will be unreliable. If at any time the readings seem suspect, check the condition of the battery by zeroing the instrument manually using ZERO. If in doubt replace the battery. For rechargeable instruments charge the internal battery with the charger supplied. Units: The unit of measurement is shown on the right hand side of the display. Being an auto ranging instrument, the correct resolution and the decimal point will be displayed according to the pressure being applied. FAST SLOW: Some pressurised circuits exhibit pressure and velocity fluctuations, which can be disconcerting; if unacceptable fluctuations occur, press FAST SLOW and verify that the slow indication is displayed on the screen. Store: Shows the number of readings stored on the instrument. To store data manually press STORE while the instrument is in Slow1, Slow2, Slow3 or Slow4 ... -
Page 6: Display
Page 04 Gauge / Duct Static Connect to Signal In. Leave Reference open to atmosphere. Measurement: Readings may be positive or negative depending on whether the system under test is above or below atmosphere pressure. Orifice Plates: Connect upstream tapping to Signal In and downstream tapping to Reference. Pressure readings should always be positive. Flow Grids: Connect +Ve tapping to Signal In and ‐Ve tapping to Reference. Pressure readings should always be positive. Inlet Cones: Connect tapping to Signal In using ‘T’ pieces to join the annular tapping together. Leave Reference open to atmosphere, ensuring that the open port is shielded against significant air movement from the ingoing airstream. Pressure readings should always be negative. Total Head Probe: Connect to Signal In. Leave Reference open. Readings should always be positive dpm‐i Pitot Tube: Input the Pitot Tube factor 0.838. Connect clear tubing to Signal In and black tubing to Reference. Use UNITS to toggle to m/s or ft/min depending upon model. Readings should always be positive. Ellipsoidal Pitot Tube: Input the Pitot Tube factor 1.000. Connect clear tubing to Signal In and black tubing to Reference. Use UNITS to toggle to m/s or ft/min depending upon model. Readings should always be positive. ... -
Page 7: User Menu 05
TT Series LR Manual USER MENU Page 05 The User Menu is used to input user values and change default settings. To access the User Menu, switch on the instrument while holding down ENTER. Page 05 Set Clock: To set the clock to local time and input the date in the chosen format. Auto Zero Time: This is factory set at 60 seconds. (for which the instrument specifications are based) Changing the default setting will override this. Inputting 0 seconds will switch off the auto zero function. A manual zeroing facility is available see Keypad Controls page 02. Page 06 Switch Off Period: To save battery the instrument will switch off after 10 minutes providing that no keys are pressed. This can be overridden by changing the default setting. RS232 Period: To print out raw data as measurements are being made, either to a thermal printer or to a PC via the Hyper terminal. Note: DP Measurement no longer supply thermal printers. Back Light Period: To alter the backlight time. Use and to switch on the back light. Temp / Pressure: To change the air stream temperature and barometric pressure. Air stream temperature set at 16 °C and Barometric pressure set at 1000 mbar. ... - Page 8 TT Series LR Manual USER MENU Page 06 Selecting from a list: Use and to scroll. Press ENTER to select. Entering a value: Use and to set each digit or value then press ENTER. Set Clock Switch Off Period Auto Zero Time 00 Minutes Switch Off Period Max Setting: RS 232 Result Period Press ENTER Min Setting: Back Light Period To switch off input: Temp / Pressure User Menu Select Date Format Exit ...
- Page 9 TT Series LR Manual USER MENU Page 07 Selecting from a list: Use and to scroll. Press ENTER to select. Entering a value: Use and to set each digit or value then press ENTER. Set Clock Date Format Auto Zero Time DD/MM/YY Switch Off Period MM/DD/YY RS 232 Result Period Exit Back Light Period Select Temp Units Temp / Pressure Centigrade Select Date Format Fahrenheit Exit Press ENTER Exit ...
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Page 10: Option Menu 08
TT Series LR Manual OPTION MENU Page 08 The Option Menu is to temporarily change default settings. To access the Option Menu, press MENU when the instrument is in operation mode. Page 08 Review Results: View stored data in the form of time, measured value and unit of measurement. Providing the stored readings are in the same unit, the average value will be shown at the bottom of the screen as the cursor moves down. Delete Last Result: Deletes the last stored value. Clear Memory: Deletes all stored data. Page 09 Set Temp / Pressure: Change the airstream temperature and barometric pressure. Start Recording: This feature is used for data logging. Up to 2500 readings can be stored. Print Results: Print measurements using a thermal printer. Page 10 PC Connection: ... - Page 11 TT Series LR Manual OPTION MENU Page 09 Selecting from a list: Use and to scroll. Press ENTER to select. Entering a value: Use and to set each digit or value then press ENTER. Review Results Set Temp / Pressure Del Last Result Temperature: 16°C Clear Memory Barometric Set Temp / Pressure Pressure: 1000 mbar Start Recording Press ENTER Max Setting: 400°C Print Results 1200 mbar PC Connection Min Setting: ‐50°C ...
- Page 12 TT Series LR Manual OPTION MENU Page 10 Selecting from a list: Use and to scroll. Press ENTER to select. Entering a value: Use and to set each digit or value then press ENTER. Software must be installed. Ensure the cable is connected to the PC via the D‐type connector. Connect the plug to the RS 232 socket. Review Results PC Communication Del Last Result Double click the mmupload icon. A window will appear Clear Memory on screen, select the comm. Set Temp / Pressure port and click the Upload Start Recording option. Another window will Print Results appear on screen. Give the PC Connection file a name; choose which ...
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Page 13: Conversion Tables
TT Series LR Manual CONVERSION TABLES Page 11 Pressure: Pa mbar O mmHg inHg Pa 1 100.0 9.806 249.1 133.3 3385 6892 mbar 0.010 0.098 2.491 1.333 33.85 68.92 O 0.102 10.20 25.40 13.60 345.42 702.8 O 0.004 0.402 0.039 0.535 13.51... -
Page 14: Duct Traverse Points
TT Series LR Manual DUCT TRAVERSE POINTS Page 12 Principle of Operation: Pitot Head The nose of the Pitot Tube should face directly into the airstream thus the Total Pressure flows down the inner tube which is connected to the Signal In port. The static holes are positioned around the side of the Pitot Tube and lead into an outer tube. This is connected to the black Velocity Pressure* = Total Pressure – Static Pressure tubing which in turn is connected to the Reference port. Calculated by the Micromanometer Log Linear Rule for Traverse Points on 3 Diameters in a Circular Duct: Ideally traverse points should be at least six duct diameters away from any bend or obstruction in the system. The Pitot Tube should be inserted at right angles to the walls of the ducts and measurements are taken in the positions shown in the diagrams (left). The directional pointer can be used to ensure that the Pitot Tube head is parallel to the duct walls. 0.032D 0.135D 0.321D 0.679D 0.865D... -
Page 15: Downloading Data
There are no user serviceable parts in the TT Series Micromanometers. With the exception of dry cell batteries there are no consumable parts. If the instrument is damaged or requires servicing, it should be returned to the Buckingham England factory. Calibration: All TT Series instruments are calibrated against equipment traceable to National Standards. It is good practice to have the instrument calibrated and checked at least once a year. The Buckingham England factory offers a calibration service: DP Measurement Unit 11, Top Angel, Buckingham Industrial Park Buckingham, England. MK18 1TH Tel / Fax: +44 (0)1280 817122 www.ttseries.com email: dpm@ttseries.com Manufactured in the United Kingdom. ... -
Page 16: Specifications
Up to 2500 any units. Software: Download data to PC in very basic form. Power Source: Dry cell (MN1604, PP3) or Rechargeable. System Air Leak: 0.1 ml/minute a 5Kpa (typical) Safe Line / Differential Pressure: 15KPa Storage Temperature Limits: ‐5° to +50°C Weight: 555 grammes with battery. Dimensions: 45 x 92 x 185 mm. Standard Accessories: 2mm x 6mm tubing adaptors (4) Instruction manual 3m x 2mm bore flexible tubing (2) Neck sling Calibration certificate Soft lined case Optional Extras: Basic software to download data to PC RS 232 lead for PC Pitot Static Tubes Rubber holster DP Measurement Unit 11, Top Angel, Buckingham Industrial Park Buckingham, England. MK18 1TH Tel / Fax: +44 (0)1280 817122 www.ttseries.com email: dpm@ttseries.com In the interest of continuous product development and improvement DP Measurement reserve the right to amend specifications and to discontinue models, features and colours of the TT Series Micromanometers at any time without prior notice ...
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