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ETC Sasquatch User Manual
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ETC Sasquatch User Manual

ETC Sasquatch User Manual

Sensor for the plunger lift field
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Sasquatch
User's Manual
Revision 5 (Firmware 1.2.x)
01-Sept-21

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Summary of Contents for ETC Sasquatch

  • Page 1 Sasquatch User’s Manual Revision 5 (Firmware 1.2.x) 01-Sept-21...

  • Page 2: Table Of Contents

    Table of Contents Description ............................1 Features ............................1 Specifications ............................2 Installation ............................3 Wiring ............................3 3.1.1 Plunger Arrival Signal ......................3 3.1.2 RS485 Modbus Slave Interface ..................... 4 3.1.3 Hazardous Location Installation and Wiring ................. 4 Mounting ............................5 Setting Sensitivity ..........................
  • Page 3 Figure 3 – Plunger Arrival Signal External Resistor Wiring .................... 4 Figure 4 – RS-485 Connection ............................4 Figure 5 – Sasquatch Mounted Using Band Clamps ...................... 5 Figure 6 – Sasquatch Mounted Below the Plunger ......................5 Figure 7 – Recommended Mounting Locations ......................6 Figure 8 - Sensitivity Dial ..............................
  • Page 4 Revision History Date Name Details 01-Sept-21 Mark Scantlebury Add in Principle of operations Re-arrange kinetic energy settings Update Measurement Status/Confidence Codes as signed values...
  • Page 5 Installation Location: Class I, Division 2, Groups A, B, C, D or Non - Hazardous Locations Only Applicable to all models WARNING - DO NOT REMOVE, REPLACE OR DISCONNECT WHILE CIRCUIT IS LIVE UNLESS THE AREA IS KNOWN TO BE FREE OF IGNITIBLE CONCENTRATIONS OF FLAMMABLE SUBSTANCES. WARNING –...
  • Page 6 Installation Location: Class I, Division 1, Groups C, D or Class 1 Zone 0 Locations Only Applicable to model ET-11000-1031-0000 ONLY WARNING – INTRINSICALLY SAFE WHEN CONNECTED PER DRAWING ET-11000-1031-2001. WARNING – EQUIPMENT SHALL BE CONNECTED TO AN APPROVED POWER SOURCE OR BARRIER THAT DOES NOT PROVIDE MORE THAN 24VDC AND 8A.

  • Page 7: Description

    By programming Sasquatch with the plunger mass, Sasquatch can be used to monitor the kinetic energy absorbed by the lubricator and spring assembly. Sasquatch can also be set to monitor and provide an alarm when the measured plunger velocity exceeds a set threshold or when the sum of all kinetic energy impacts exceeds a limit.

  • Page 8: Specifications

    2 Specifications Electrical Supply Voltage 5 – 24Vdc Current Draw Typ. - 7.5mA, Max. – 8mA @ 5Vdc, T=25 °C Communications Communications Port 2-Wire RS-485 Modbus Slave, internally termination Baud Rates (bps) 1200, 2400, 4800, 9600*, 19200, 38400, 56000, 115200, 128000, 256000 Data Bits 7, 8*...

  • Page 9: Installation

    3 Installation 3.1 Wiring Sasquatch uses the same wiring scheme as a traditional plunger arrival sensor and adds a 2-Wire RS485 Modbus interface. Figure 1 - Sasquatch Physical Connections Pin Name Description COM* Ground Plunger arrival signal, Dry Contact Sensor Power...

  • Page 10: Rs485 Modbus Slave Interface

    Figure 4 – RS-485 Connection 3.1.3 Hazardous Location Installation and Wiring If Sasquatch is to be used as part of an intrinsically safe install (Div 1/Zone 0), a barrier device may be required. Installation must be completed according to drawing ET-11000-1031-2001 and any applicable national and local electrical code by qualified personal.

  • Page 11: Mounting

    Figure 5 – Sasquatch Mounted Using Band Clamps Sasquatch needs to be positioned on the lubricator so that the plunger can pass by the sensor. The sensor should be placed as low on the lubricator as is practical. Since Sasquatch measures the magnetic signature of the plunger, mounting where a balance of metal above and below the sensor will give the best results.

  • Page 12: Setting Sensitivity

    Sasquatch has sensitivity selection dial located above the wire terminals. The sensitivity dial allows the operator to adjust the threshold at which Sasquatch will detect a plunger arrival. By default the switch is set to 4 which is the middle of the range. If false arrivals occur the dial can be set to a less sensitive setting to or conversely if missed arrivals occur, the sensitivity can be increased.

  • Page 13: General Operation

    4.1.3 Capture – Full Debug In this sensor mode, Sasquatch will send a real time plot of the magnetic field as seen by each of the two sensing elements inside Sasquatch. To view the plot in ETC Vision, select the capture tab and start the...

  • Page 14: Capture - Raw Samples

    4.1.4 Capture – Raw Samples In this sensor mode, Sasquatch will send a real time plot of the magnetic field, however it will not process the data in any manner. This mode may be requested by ETC Support while diagnosing technical issues.

  • Page 15: Plunger Activity Hold

    Once the signal has exceeded the baseline by at least the threshold (defined by the sensitivity switch), the plunger is considered arrived. In the case of the Sasquatch, the output is not set until the velocity has been calculated and made available via the Modbus log. This prevents the control system from reading the velocity before it is ready.

  • Page 16: Fixed Pulse Length

    This mode ensures that the output signal is held for a specified amount of time each time that the plunger arrives. The length of the pulse is programmed by the Minimum Output Hold Time setting. Another arrival pulse will not occur until Sasquatch can no longer detect a moving plunger followed by the plunger arriving again.

  • Page 17: Post Arrival Operation

    Figure 14 - Velocity Scaled Output Timing 4.3 Post Arrival Operation Once the Sasquatch has detected the arrival, it calculates the velocity, sets and holds the output switch, and then re-initializes once the plunger has departed to avoid recording numerous arrivals as the...

  • Page 18: Re-Initialize Timer

    Figure 15 - Post Arrival Operation 4.3.1 Re-Initialize Timer After an arrival, Sasquatch has a cool-down timer that must elapse before it will detect another arrival. This timer specifies how long to wait after Sasquatch can no longer detect the plunger before re- initializing the sensor, ready to detect the next arrival.

  • Page 19: Table 1 - Lubricator / Spring Wear Settings

    The Sasquatch allows you to specify alarm thresholds in either velocity or kinetic energy units. It is up to the user to decide which to use. Velocity thresholds may be more familiar to some users but requires a manual calculation to check that it is within the lubricator specifications.

  • Page 20: Lubricator/Spring Wear Settings

    The mass of the plunger in thousandths of a pound (grams). Ex. 5lbs plunger = 5000 This is required in order for the Sasquatch to calculate accurate kinetic energy of the arriving plunger as it hits the lubricator. If this information is not set, the velocity-based alarms will still operate.

  • Page 21: Cathodic Protection

    Associated Alarm: Consecutive Hard Arrival Alarm 5.1.1.7 Cumulative Hard Arrival Threshold The Sasquatch counts the number of arrivals above the Hard Arrival threshold. If this count exceeds the Cumulative Hard Arrival Threshold, and alarm flag is set. These do not need to be consecutive hard arrivals to trip the alarm.
  • Page 22 Please do keep in mind that any shielding on the cable that is connected to the case of the Sasquatch will act as a path for any stray voltage to travel.

  • Page 23: Figure 17 - Etc Link Desktop

    ETC Vision can use any serial to RS485 adapter to communicate with Sasquatch, however for convenience ETC offers the Link USB to RS485 adapter kits in both a desktop and intrinsically safe version. The desktop kit is to be used for programming/configuring Sasquatch in non-hazardous areas while the IS kit can be used on live installs.

  • Page 24: Table 2 - Modbus Register Types

    Appendix B Modbus Register Types and Formats Register Types There are 4 types of supported Modbus registers Table 2 – Modbus Register Types Description Modbus Function Code 01 – Read Coil 0XXXX Coils – 1-bit values with read/write access 05 – Force Single Coil 02 –...

  • Page 25: Table 4 - Register Endianness Format

    Table 4 – Register Endianness Format Register Number Most Significant Word N + 1 Least Significant Word Date/Time Register Date and time can be read/written in one of two formats, use the “Time Format” coil to choose the desired format. •...

  • Page 26: Table 6 - Available Coils

    Appendix C Modbus Register Map Note: Any registers that are not listed have not been implemented. Writes to these registers will be ignored and reads from these registers will return unpredictable results. Note: Modbus uses a register number that starts at 1 where the address that is passed in the protocol layer starts at 0.

  • Page 27: Table 7 - Available Discrete Inputs

    Discrete Inputs Table 7 - Available Discrete Inputs Register Description Read General Information 10001 Date/Time Set 0 – date/time not set 1 – date/time set Sensor Status 10011 Plunger Arrival Status 0 – Absent 1 – Present 10012 New Velocity Indicator 0 –...
  • Page 28 Register Description Format Read 30004 Firmware Version – Minor Version 0 – 99 30005 Firmware Version – Fix Version 0 – 99 30006 Hardware Version 0 – 99 Sensor Information 30012 Dial Switch Setting 1 – 7 30013 Sensor Sensitivity Threshold 0 –...

  • Page 29: Table 9 - Available Holding Registers

    Register Description Format Read 32102 + 6(n-1) Daily Log Save Time – Entry n Date / Time Register Format n = 1 - 15 32107 + 6(n-1) 32192 + (n-1) Daily Log Plunger Arrival Count 0 – 65534 – Entry n n = 1 –...
  • Page 30 Register Description Format Read/Write 40047 Re-Initialize Timer 1 – 65535 s default = 1s Modbus COM Settings 40051 Baud Rate 0 – 1200 bps 1 – 2400 bps 2 – 4800 bps 3 – 9600 bps* 4 – 19200 bps 5 –...