User`s Manual: MODEL 904-T CLINOMETER PAK
Contents
1. Ordering Information Model 904 TH 10 degrees range Model 904 TS Model 904 TW 50 degrees range To add the following features specify option code after Model Number Option Code Feature 6 pin male receptacle connector for clinometer cable RMS225 Digital multimeter display unit used with Model 870 01439 Mountingbracketforverticalsurfaces B 97 1003 Rev C 3 Figure 1 Model 904 T Clinometer Pak TING HOLE A A lt lat S a P CF y o d SP 173 4 4 T LLL A A Y X 7 9 7 pa S S ER TA EN ne A 4 m4 HT LIO HT r2 2 gt m ECTION A A IMENSI IN inc mi Figure 2 Enclosure and mounting hole dimensions B 97 1003 Rev C 4 3 Wire Color Code and Connector Pin Designations Color coding of the wires in the Clinometer Pak cable is shown in Table 1 Pin assignments refer to connector P N 62204 which is available as an option and is attached to the end of the clinometer cable This connector is used for connecting the Clinometer Pak to a Model 870 Readout Module or whenever there is a quick connect disconnect requirement Table 1 Wire Color Code and Connector Pin Designations Pin P N 62204 Signal Ground White BO Green D 4 Grounding and Transient Protection The signal cable of the Clinometer Pak contains two ground wires A black power ground2. WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY THIS WARRANTY EXTENDS ONLY TO THE ORIGINAL PURCHASER AND IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES B 97 1005 Rev C 9 WHETHER OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR USE AND OF ALL OTHER OBLIGATIONS AND LIABILITIES OF ANY KIND AND CHARACTER THERE ARE NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF a AGI s liability arising out of the sale of its goods is expressly limited to the repair and or replacement of defective parts or the cost of such repair and or replacement b If software does not perform substantially in accordance with the documentation the entire and exclusive liability and remedy shall be limited to either at AGI s option the replacement of the software or the refund of the license fee you paid for the software c Liability for any other form of loss or damage is hereby expressly excluded d Customer shall indemnify AGI against any third party claim arising out of the use of goods and or services supplied by AGI including any claim arising directly or indirectly out of alleged negligence on the part of AGI its employees servants representatives or agents B 97 1005 Rev C 10 Appendix A Computation of Cross Axis Tilts Problem 1 Rotation occurs in a vertical plane parallel to direction C 2 Find angle a which defines C direction 3 Find amplitude of rotation Oc Assumptions Plan View 1 Planes XY an
3. 0 17453 17 45 0 2094 furatins Iso sae oce 1 ooo anu B 97 1005 Rev C 6 7 Measuring and Removing Zero Offset Bias Bias B is defined as the difference between the true angle and the angle reported by the clinometer when it it level Think of a perfectly horizontal surface with your Clinometer Pak sitting on it If there were no bias the output would read 0 volts on both channels or 2 5 volts for unipolar clinometers with 0 5 volts output In reality the outputs of most clinometers are not 0 volts when level because of mechanical tolerances in the component parts sensor screws standoffs etc To measure and remove bias do the following 1 Place the clinometer on an approximately horizontal surface table top granite flat etc Read the output voltages Vx and Vy for each channel and then compute the indicated angles 0x and Oy by multiplying by the scale factors for your clinometer found in Appendix B For example 0x Vxi x Sx where Sx is the scale factor for the X channel 2 Rotate the tiltmeter 180 degrees on the surface so that it is facing the opposite direction Figure 3 Read the new output voltages Vx and Vy and compute the angles 0x and Oy using the same procedure as in step 1 above The scale factors are the same for both steps 3 The biases are given by the formulae Bx 0x1 x2 2 and By Oy 0y2 2 Record these biases and subtract them from all subsequent measuremen
4. User s Manual MODEL 904 T CLINOMETER PAK Model 904 T Serial No Bipolar Output 22 5 volts typical Unipolar Output 0 5 volts typical Model 870 Readout Module Serial No optional APPLIED GEOMECHANICS 2007 Applied Geomechanics Inc All rights reserved 140 Chestnut Street San Francisco CA 94111 Phone 415 364 3200 Fax 415 861 1448 www geomechanics com applied geomechanics com www geomechanics com 1 Introduction B 97 1005 Rev C The Model 904 T Clinometer Pak is an economical biaxial inclinometer in a rugged NEMA 4X IP65 enclosure Figure 1 It is suitable for a wide variety of monitoring and measurement applications in the factory or laboratory or under harsh outdoor conditions Tilt angles measured with the Model 904 T Clinometer Pak are gravity referenced For this reason your Clinometer Pak will measure angular rotation in any location and can be installed anywhere There is no need for special shafts linkages or fixturing to obtain a useful reading The sensing element in the Clinometer Pak is an electrolytic tilt sensor comprised of a glass vial containing a conductive liquid and five platinum clad electrodes As the sensor tilts the liquid alternately covers and uncovers opposing electrodes changing the AC resistance measured along different paths through the sensor The arrangement of the four outer electrodes in four quadrants enables the electronics to resolve the direction and magnitude of rot
5. anty period provided that they are returned prepaid to AGI and a that the goods were used at all times for the purpose for which they were designed and in accordance with any instructions given by AGI in respect of them b that notice is received by AGI within 30 days of the defects becoming apparent and c that return authorization is received from AGI prior to the goods being sent back Should goods be damaged in transit to the Purchaser AGI will accept no liability unless the Purchaser can show that such damage arose solely from AGT s failure to pack the goods properly for shipment Software products are warranted to perform substantially in accordance with their documentation for 90 days following your receipt of the software AGI and its suppliers do not and cannot warrant the performance or results you may obtain by using the software or its documentation In respect of goods or parts thereof manufactured by others and resold by AGI AGI will pass on to the customer the benefit of any guarantee or warranty received by AGI from the original manufacturer insofar as such guarantee or warranty is assignable ANY OTHER CONDITIONS OR WARRANTIES WHETHER EXPRESS OR IMPLIED BY STATUTE OR OTHERWISE ARE EXCLUDED THE REMEDIES PROVIDED HEREIN ARE THE BUYER S SOLE AND EXCLUSIVE REMEDIES APPLIED GEOMECHANICS INC SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES INCLUDING LOST PROFITS OR LOST SAVINGS
6. ation in two orthogonal vertical planes X and Y The Clinometer Pak electronics converts the raw AC signals to high level DC voltage outputs that are sent down the instrument s cable A temperature sensor also is included in your Clinometer Pak Output is a DC voltage proportional to temperature in degrees Celsius B 97 1005 Rev C 2 2 Specifications TILT OUTPUT Two orthogonal tilt angles 2 5 volts single ended standard 0 5 volts available TEMPERATURE OUTPUT 0 1 C mV 0 75 C accuracy 0 C 0 mV bipolar output version 0 C 2 5 V 0 5 V output version TIME CONSTANT T NATURAL FREQUENCY TEMPERATURE COEF Span 0 03 C Zero 10 20 arc sec C typ POWER REQUIREMENTS 8 to 24 VDC bipolar output version or 10 5 to 26 5 VDC 0 5 V output version 7 mA 250 mV ripple max reverse polarity protected ENVIRONMENTAL 10 to 70 degrees C operating and storage 100 humidity ENCLOSURE Painted NEMA 4X IP65 aluminum box 120 x 80 x 60 mm Four 4 4 mm dia mounting holes at comers of 107 x 67 mm rectangle CABLE 10 ft 3 m multiconductor cable with PVC jacket and tinned ends longer cable available WEIGHT 1 b 0 4 kg Model 904 TH Model 904 TS Model 904 TW High Gain Version Standard Version Wide Angle Version ANGULAR 10 degrees 425 degrees 50 degrees RANGE SCALE FACTOR LINEARITY 1 of full span typical 2 5 of full span typical 7 5 of full span typical 1 290 of half span
7. d CD are initially horizontal Y A 2 Scale factors Sx and Sy for rotations in D vertical planes parallel to X and Y directions r C are given 3 Bias voltages Vxg and V yg have been determined Bias voltages are the tiltmeter s X and Y outputs when it is perfectly horizontal and are equal to Vxg Vxi Vxo 2 and Vyp Vy Vy2 2 See Section 7 for further explanation 4 Solution For rotation in the X or Y directions rotation angle is given by 0x Sx Vx and Oy Sy Vy where Sx and Sy are the scale factors presented in the user s manual or calibration certificate Vx is the measured X voltage minus Vxg and Vy is the measured Y voltage minus Vyp For rotation in the C direction we can define new scale factors Sc 2 Sx cos a and Sc Sy cos 90 a And the rotation angle in the C direction becomes Oc Sx cos a Vx 1 Oc Sv cos 90 a Vy 2 Eguating 1 and 2 and solving gives SxVx cos a SyVy cos 90 a SxVx Sy Vy cos a cos 90 a 1 tan a B 97 1003 Rev C 11 a tan SyVy SxVx 3 Substituting a in equation 1 or 2 along with the known values of Sx and Vx or Sy and Vy gives the rotation angle Oc Summary Steps in Measuring Cross Axis Tilt Angle Oc 1 Measure bias voltages Vxp and Vyp on both tilt channels 2 Subtract Vx and V yg from measured voltages to obtain corrected outputs Vx and Vy for use in eqns 1 through 3 3 Compute a fr
8. ltimeter display the multimeter must be in its DC Volts setting The temperature channel cannot be read using the Model 870 m a APPLIED N EIA CHECK GEOMECHANICS l ITCH INCORPORATED LD INCH SPACI TOGGLE 3 SWITCH v EA Y E NEL Figure 4 Model 870 Readout Module B 97 1003 Rev C 8 9 Model 870 Battery Replacement If the voltage level of the Model 870 Readout Module battery drops below 8 volts the battery should be replaced The battery is a standard 9 volt radio battery available in most supermarkets and hardware stores To replace the battery 1 Remove the four metal screws from the back panel Carefully separate the back panel from the front portion of the Readout Module Do not twist or pull the internal wiring 2 Replace the old battery with a fresh new battery 3 Replace the back panel 10 Warranty and Assistance Standard goods those listed in Applied Geomechanics published sales literature excluding software manufactured by Applied Geomechanics Inc AGI are warranted against defects in materials and workmanship for twelve 12 months from the date of shipment from AGI s premises with the following exceptions Series 900 analog or digital clinometers are warranted against defects in materials and workmanship for 90 days from the delivery date AGI will repair or replace at its option goods that prove to be defective during the warr
9. om equation 3 using known scale factors Sx and Sy 4 Compute Oc from equation 1 or 2 B 97 1005 Rev C 12 Appendix B Calibration Certificates B 97 1005 Rev C 13
10. or the polynomials in the Calibration Certificate at the end of this manual To use the scale factor simply multiply the voltage reading by the scale factor For example if the scale factor of the X channel is 10 06 degrees volt and the X output is 2 000 volts the tilt angle is 20 12 degrees including the bias To obtain tilt angles from the polynomial substitute your voltage reading for the variable V and use the listed polynomial coefficients Again the computed angle includes the bias Using the polynomial eliminates most of the nonlinearity and gives the most accurate results To convert from degrees to other angle units arc minutes mm meter etc refer to Table 2 The instructions in the paragraph above are for rotations in the one of the principal planes of the Clinometer Pak that is in a vertical plane parallel to either the X or the Y arrow on the label on the enclosure Rotation in another vertical plane is termed a cross axis tilt Computation of cross axis tilt angles is described in Appendix A To obtain temperature in degrees Celsius from clinometers with bipolar output simply multiply the voltage reading on the temperature channel by 100 C V 0 1 C mV To obtain readings from clinometers with unipolar output first subtract 2 5 volts from the voltage reading then multiply the result as above Table 2 Angle Conversion Chart EE degrees arc minutes arc seconds radians mm meter inches ft degrees 1 360
11. ts to get the true angle EO lt SR Cen D SS VS Np POSITION 1 ASA TIS Figure 3 Measure tilt angles in these two positions to compute clinometer bias B 97 1005 Rev C 7 8 Using the Model 870 Readout Module The Model 870 Readout Module may be used to power your Clinometer Pak units with bipolar output only and switch the X and Y channel outputs to a digital multimeter for display If your Clinometer Pak was shipped with a Model 870 it will have a 6 pin connector P N 62204 on the end of its cable The connector on the end of the Model 870 cable is P N 62202 Skip this section if you did not purchase a Model 870 The Model 870 Readout Module is designed for use with any hand held multimeter containing banana plug sockets with standard 0 75 inch center to center spacing Figure 4 To use the Model 870 first plug it into your clinometer cable via the 6 pin connector Then plug the it into your multimeter via the banana jacks red to red black to black Set the multimeter to its DC Volts setting and turn it on Turn the X OFF Y switch on the Model 870 to the X or Y position this powers the clinometer Now depress the BATTERY CHECK button If the voltage displayed on the multimeter is below 8 volts replace the battery inside the Model 870 with a new one as described in the next section You are now ready to read your Clinometer Pak Turn the toggle switch to X or Y and read the output voltage on the mu
12. wire and a white signal ground wire Power and signal ground are common on the internal printed circuit assembly We recommend that the black wire be connected to the ground of your power supply and that the white wire be connected only to the signal ground of your recording device digital voltmeter A D converter etc Under normal conditions the two wires should be not be shorted together at the power supply end Keeping them separate prevents a voltage drop caused by current flowing in the signal ground wire and keeps the reference potential the same at both ends of the cable Your Clinometer Pak is reverse polarity protected but is not surge transient protected A high voltage transient exceeding the 24 VDC input range could damage the electronics 5 Installing Your Clinometer Pak The Clinometer Pak has four mounting holes Figure 2 for fastening it to a P N 01454 01 Mounting Plate for horizontal surfaces to a P N 01439 Mounting Bracket for vertical surfaces or directly to the surface to be monitored These holes are 4 4 mm 0 173 inch in diameter and accept a no 8 screw Access to the mounting holes is by removing the lid of the enclosure B 97 1005 Rev C 5 For best results install your Clinometer Pak in a shaded location away from temperature extremes 6 Converting Voltage Readings to Tilt Angles and Temperatures The voltage outputs of the Clinometer Pak are quickly converted to tilt angles using the scale factors
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