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Applied Physics Systems 851 User Manual

Natural gamma sensor
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DOC PN: 260-0922
MODEL 851
NATURAL GAMMA SENSOR
USER MANUAL
DOC DESC: Model 851 User Manual
CONTACT US
HEADQUARTERS
425 Clyde Avenue Mountain View, CA 94043
OFFICE
650.965.0500
EMAIL
info@appliedphysics.com
APPLIEDPHYSICS.COM
1
APPLIED PHYSICS SYSTEMS, INC. | APPLIEDPHYSICS.COM
SEPTEMBER2022. REVISION: 04

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Summary of Contents for Applied Physics Systems 851

  • Page 1 DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 MODEL 851 NATURAL GAMMA SENSOR USER MANUAL CONTACT US HEADQUARTERS 425 Clyde Avenue Mountain View, CA 94043 OFFICE 650.965.0500 EMAIL info@appliedphysics.com APPLIEDPHYSICS.COM APPLIED PHYSICS SYSTEMS, INC. | APPLIEDPHYSICS.COM...

  • Page 2: Copyright

    DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 COPYRIGHT Copyright 2014 - 2022 Applied Physics Systems Incorporated. All Rights Reserved. The contents of this manual may not be reprinted in part or whole without permission. The contents of this manual are subject to change without notice.

  • Page 3: Table Of Contents

    5 - DATA INTERFACE ..............................9 6 - MODEL 851 GAMMA SENSOR COMMANDS ..................10 6.1 – MODEL 851 SYSTEM BINARY DATA REQUEST COMMANDS ............11 6.1.1 - ID COMMAND (KEYBOARD COMMAND 0, 0X30 HEX) ............... 12 6.1.2 - BINARY COUNT COMMAND (KEYBOARD COMMAND 1, 0X31 HEX) ........12 6.1.3 - BINARY RATE COMMAND (KEYBOARD COMMAND 2, 0X32 HEX) ........

  • Page 4: Tables

    6.2.1 - ASCII RATE COMMAND (KEYBOARD COMMAND 6, 0X36 HEX) .......... 15 6.2.2 - ASCII ACCELEROMETER COMMAND (KEYBOARD COMMAND 7, 0X37 HEX) ....15 6.2.3 - ASCII SEND 851 CONFIG DATA COMMAND (KEYBOARD COMMAND R, 0X72 HEX) ......................................16 6.3 - MODEL 851 CONFIGURATION COMMANDS ..................17 7 - CORRECTIONS TO THE GAMMA COUNT RATE FOR USE IN MWD SYSTEMS ......

  • Page 5: Introduction

    (such as sandstones and limestones), which are generally less radioactive than nonporous strata (such as shales). The Model 851 gamma sensor can be used as either a standalone system or in conjunction with Model 850 directional sensors: •...

  • Page 6: System Specifications

    DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 2 - SYSTEM SPECIFICATIONS This section describes the system specification for the Model 851 Gamma Sensor. Table 1. Model 851 Gamma Sensor Specifications Electrical Input Voltage Range +15 V to +30 V...

  • Page 7: Mechanical Features

    SEPTEMBER2022. REVISION: 04 3 - MECHANICAL FEATURES A drawing of the Model 851 Sensor is shown in Figure 1. When used in pulser or EM MWD systems, usually the Model 851 is mechanically connected directly to a Model 850 directional sensor and mounted in a cylindrical pressure barrel. An overlap mechanical connection using four 8-32 stainless steel screws is used to attach the Model 851 to the Model 850 directional sensor.

  • Page 8: Electrical Interface

    Not used Communication with the Model 851 is accomplished via the TTL-level serial communications lines shown in Table 2. The Model 851 can be connected to a PC for testing if a TTL-to-RS232 conversion box is inserted in the communication lines between the Model 851 and PC.

  • Page 9: Data Interface

    9600 using 8-bit data words with one stop bit and no parity bit. An easy method of communicating with the Model 851 is to use a PC running a terminal emulator program such as Windows HyperTerminal or ProComm. When...

  • Page 10: Model 851 Gamma Sensor Commands

    ASCII data request commands • Configuration commands To send a data request command to the 851 system, enter the command token <Ctrl/F> (pressing the Ctrl key and the f key simultaneously) followed by one of the keyboard commands listed in Table 3. Press Enter to send the command.

  • Page 11: Model 851 System Binary Data Request Commands

    DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 Table 3. Model 851 Data Request Commands Keyboard Hex Command Command Result Command 0x30 Send 851 identity data (see Section 6.1.1 for more information) 0x31 Send binary count data in binary format (see Section 6.1.2 for more information)

  • Page 12: Id Command (Keyboard Command 0, 0X30 Hex)

    DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 6.1.1 - ID COMMAND (KEYBOARD COMMAND 0, 0X30 HEX) The data in this command is the ASCII string "01Gamma 004" which identifies the unit. Example of a 0x30 response: 06 30 30 31 47 61 6D 61 20 30 30 34 0A 58 A7 06 04 Table 4 explains the contents of this sample data response packet.

  • Page 13: Binary Rate Command (Keyboard Command 2, 0X32 Hex)

    DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 Example of a 0x31 response: 06 31 00 02 57 AD 00 00 01 D2 01 01 BB 19 06 04 The table below explains the contents of this response: Table 5.

  • Page 14: Binary Transmission Decoding Convention

    DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 commands or set to a user defined time by using the wa command (see Section 6.3 for an explanation of these commands). An example of the binary command...

  • Page 15: Model 851 System Ascii Data Request Commands

    273 so the rate is 273/10.2=26.8 cps. When the ASCII rate command is received the 851 sensor responds by sending the time and number of counts since the last ASCII rate command. The time and count values are then zeroed so that time and count accumulation can restart.

  • Page 16: Ascii Send 851 Config Data Command (Keyboard Command R, 0X72 Hex)

    Tstart:+180.000 T_X2:+0.00002500 T_X1:-0.00350000 T_X0:+1.07000005 TempScale(degree/count):+0.12130 TempOffset(degree c):+273.0 Cal:+25.0 Pulseout mode: Uncorrected The table below explains the contents: Table 7. Send Model 851 Config Command Format Example Key Contents Description APS SNG0001 APS Gamma serial number Gamma Autosend Delay Autosend inter-packet delay time...

  • Page 17: Model 851 Configuration Commands

    Enter key. The Model 851 system has 22 configuration commands. Many of these commands should only be used during the calibration of the 851 system. See Appendix A for a complete list of configuration commands. The table below contains the...

  • Page 18: Corrections To The Gamma Count Rate For Use In Mwd Systems

    These factors tend to reduce the count rate recorded by the 851 sensor from the true borehole formation count rate. The true borehole count rate must be determined; to do so, correct the Model 851 count rate for the following factors: •...

  • Page 19: Pressure Barrel Correction (Pb Correction)

    DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 greater. Generally the drill collar will produce the largest correction factor. These correction factors are described in more detail below. 7.1 - PRESSURE BARREL CORRECTION (PB CORRECTION) The following two graphs show pressure barrel correction factors using inch and centimeter units.

  • Page 20: Drill Collar And Drilling Fluid Correction (Cm Correction)

    DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 Figure 4. Pressure Barrel Correction Factors in Centimeters If a pressure barrel is manufactured with a metal other than beryllium copper (density 8.2 gram/cm³) then the PB correction factor should be multiplied by the ratio of the density of the new metal divided by the density of beryllium copper.
  • Page 21 DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 Collar ID (cm), cid 2. Collar OD (cm), cod 3. Bit diameter (cm), bit 4. Mud density (gram/cm), md 5. Collar density (gram/cm), cd The BF is given by the following equation: BF=(7 + (md * (cid-4.445)/2)) + (cd*(cod-cid)/2) +(md*(bit-cod)/2)

  • Page 22: Net Systems

    DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 8 - NET SYSTEMS The Applied Physics Systems .NET protocol is based on a polled protocol and is implemented by means of a two-wire serial data link, which is connected in parallel to all auxiliary sensors.

  • Page 23: Net Packet Description

    DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 8.1 - NET PACKET DESCRIPTION Each NET packet containing data is a short string of bytes, with the following format: <Token> <Command> <data1> <data2>…<dataN> <CRCL> <CRCH> <token> <Eot>...

  • Page 24: Net Protocol

    DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 <0x01> <0x73> <0x06> <0x06> <0x19> <0x06> <0x06> <0x06> <0x06> <0x56> Note that the double token becomes four tokens, each pair in the transmitted string representing one token in the original message.

  • Page 25: The Crc Program

    An example of a command response from the Model 851gamma sensor is shown below. The data request command sent by the NET master (usually a directional sensor) to the 851 system is two bytes: <06> <0x31>. The response is of the form: <0x06> <0x31> <Time> <Count> <mx> <my> <CRC> <0x06><0x04>...
  • Page 26 DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 The same routine can be used to check the CRC. Again, start with the CRC=0, and update the CRC with each byte received. After the last data byte, the received CRC itself is used to update the CRC being computed.
  • Page 27 DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 const WORD crc16tab[256] = { 0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241, 0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440, 0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40,...

  • Page 28: A - Model 851 Configuration Command Reference

    DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 A - MODEL 851 CONFIGURATION COMMAND REFERENCE A complete listing of the Model 851 configuration commands is shown in Table 11 below. Table 11. Model 851 Configuration Commands Keyboard Command Result...
  • Page 29 DOC PN: 260-0922 DOC DESC: Model 851 User Manual SEPTEMBER2022. REVISION: 04 There are two Help commands, ch and wh. Below are samples of the Help output: • Configuration Command Help With Config Parameter, Command: 'contrl+f''c''x''parameter' (contrl+f means hold down control key and type f key)

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