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ACM ST200 Instructions Manual

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INSTALLATION AND OPERATING
INSTRUCTIONS FOR THE AMC-ST200, ST350,
IMPORTANT:
Please read these installation and operating instructions
completely and carefully before starting.
.........................................................................................................................................Copyright 1999
The Armstrong Monitoring Corporation (AMC)
ST200
ST300
SERIES
INSTRUCTIONS
AMC-ST200 Electrochemical
AMC-ST350 Solid State
AMC-ST360 Catalytic
ST360 TRANSMITTERS
(613) 225-9531 - Å
(613) 225-6965 - (Fax)
1 (800) 465-5777 - Å (U.S. Toll Free)

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  • Page 1 ST300 SERIES INSTRUCTIONS AMC-ST200 Electrochemical AMC-ST350 Solid State AMC-ST360 Catalytic INSTALLATION AND OPERATING INSTRUCTIONS FOR THE AMC-ST200, ST350, ST360 TRANSMITTERS IMPORTANT: Please read these installation and operating instructions completely and carefully before starting............................Copyright 1999 The Armstrong Monitoring Corporation (AMC) (613) 225-9531 - Å...

  • Page 2: Table Of Contents

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter WARRANTY .......................1 LIABILITY......................1 MODIFICATIONS AND SUBSTITUTIONS............1 PRODUCT RETURN ...................2 PRODUCT INFORMATION................2 FACTORY CALIBRATION ................2 SECTION I........................3 GENERAL DESCRIPTION .....................3 1.1 DESCRIPTION ....................3 1.2 SPECIFICATIONS ..................5 1.2.1 SENSOR VOLTAGE (ST350/360 Series) ...........5 1.2.2 SIGNAL OUTPUT ..................5 1.2.3 POWER SUPPLY ..................5 1.2.4 CALIBRATION RANGE ................5 1.2.5 CALIBRATION RESOLUTION..............5...
  • Page 3 4.2.2 BALANCE ADJUSTMENT..............17 4.2.3 ST350/ST360 SERIES INITIAL FIXED GAIN ADJUSTMENT ..17 4.3 SENSOR FAULT SUPERVISION..............18 SECTION V........................20 MODEL ST200 ELECTROCHEMICAL SERIES ............20 5.1 GENERAL DESCRIPTIONS .................20 5.2 INITIAL START-UP AND CALIBRATION PROCEDURE ......20 5.2.1 SENSOR RESPONSE COEFFICIENT..........21 5.2.2 SELECTING PRE-AMP GAIN RESISTOR R13.........21 5.2.3 INITIAL FIXED GAIN ADJUSTMENT..........21...

  • Page 4: Warranty

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter WARRANTY: The AMC-ST Series Super Transmitter is warranted against defects in material and workmanship for a period of two years from date of delivery (For sensor, see 1.2 sensor Specifications). During the warranty period, we will repair or replace components that prove to be defective in the opinion of The Armstrong Monitoring Corporation (AMC).

  • Page 5: Product Return

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter PRODUCT RETURN: All products returned for warranty service will be prepaid freight and they will only be accepted with an R.M.A. number issued by AMC. All products returned to the client will be freight collect. PRODUCT INFORMATION: Transmitter/Sensor unit Order Number ……..

  • Page 6: Section I

    Transmitters. Three models of the ST Series are described within this manual. The ST360 Series accepts catalytic bead combustible sensors. The ST350 Series is a non-intrusive transmitter used with solid state sensors. The ST200 Series accepts electrochemical toxic and oxygen sensors.
  • Page 7 Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter The only tool required to perform calibrations is a small magnet, which is provided on a key chain. The integral 3 1/2 digit LCD readout may be calibrated for direct reading in engineering units such as percent of LEL (lower explosive limit) or PPM (parts per million).

  • Page 8: Specifications

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter FIGURE 1.1 SPECIFICATIONS: 1.2.1 SENSOR VOLTAGE (ST350/360 SERIES): Adjustable Voltage; 2 W Max. 1.2.2 SIGNAL OUTPUT: 4-20 mA into 800 Ohms Max. with 24VDC Power Standard 1.2.3 POWER SUPPLY: 18-30 VDC; 4 W Max. 1.2.4 CALIBRATION RANGE: ZERO - + 15 % of Full Scale SPAN –...

  • Page 9: Accuracy

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter 1.2.6 ACCURACY: ± 0.1% of Full Scale ± 1 Count 1.2.7 AMBIENT TEMPERATURE RANGE: -40 to +60 °C 1.2.8 TEMPERATURE DRIFT: Less than 0.1% /°C over Ambient Temperature range. 1.2.9 HOUSING: Explosion Proof Class 1, Groups B, C, D & Class 2, Groups E, F, G with CSA and FM approval.

  • Page 10: Section Ii

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter SECTION II INSTALLATION MOUNTING: The ST Series is packaged in an explosion-proof housing with two 3/4 inch N.P.T. conduit hubs located in line and across the housing from each other (see figure 8.1). This housing has symmetrical mounting holes for the electronics, which are drilled so the conduit hubs may be oriented across the bottom, top, left side or right side.
  • Page 11 The sensor voltage level may be measured across A and R. For AMC-ST200 Series units, TB1 terminals are labeled S, R, and C. S is for the SENSE electrode, R for the REFERENCE electrode and C for the COUNTER electrode.

  • Page 12: Section Iii

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter SECTION III OPERATING PROCEDURES NORMAL MODE OPERATION: The NORMAL MODE is present any time the LCD’s left hand arrow or the FAULT / KEYPAD LED is not illuminated. During this time the ST Series functions as a 4-20 mA transmitter with a digital LCD readout.

  • Page 13: Routine Calibrations Using Cal Mode

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter ROUTINE CALIBRATIONS USING CAL MODE: Routine calibrations of gas readings are easily performed using the magnet tool provided with each ST Series Non-Intrusive Calibrating Transmitter. To enter CAL MODE, briefly hold the magnet close to the small dot located on the lower left of the front panel. The left hand arrow on the upper left side of the LCD will illuminate and the 4-20 mA output is locked at 1.5 mA, indicating the ST Series is ready for calibration.

  • Page 14: Delay Modes

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter reading to ZERO. However, it will be at the end of its adjustment range. If the ZERO adjustment required is greater than +10% of full scale, a BALANCE adjustment should be performed as described in section 4.2.2. In UNITY GAIN the SPAN controls have a 0.5 to 2 adjustment range.

  • Page 15: Automatic Cal Mode Exit Timer

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter 3.5.3 AUTOMATIC CAL MODE EXIT TIMER: The ST Series 4-20 mA output is held at 1.5 mA during the CAL MODE. This alerts any loop monitoring devices that a special condition is present. Since it is possible for an operator to forget to return the ST Series to the NORMAL MODE, a 5 minute timer monitors the magnetic keypad during the CAL MODE.
  • Page 16 Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter A. Remove the two thumbscrews attaching the front panel assembly to the enclosure. This assembly is connected to the I/O PCB via a ribbon cable long enough to remove it from the enclosure without disconnection. Removal exposes ZERO (R20) & SPAN (R19) potentiometers and J1 &...
  • Page 17 Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter CPU PCB FRONT P ANEL CPU PCB (BACK SI DE) THUMB SCREW 1 2 3 RIBBON CABLE TO I /O PCB FAULT/ KEYP AD LED LC D ZER O R2 0 L CD SPA N R 19 ASSY 10-0120 MA DE IN USA...

  • Page 18: Section Iv

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter SECTION IV MODEL ST350 & 360 SERIES GENERAL DESCRIPTION: Catalytic bead sensors interfaced to the ST360 Series are powered by a high efficiency switching power supply with an adjustable output to accommodate many sensor voltage requirements.

  • Page 19: Sensor Voltage Adjustment

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter IMPORTANT: Be sure to re classify the area non-hazardous before opening the ST Series or any other electronic enclosures. 4.2.1 SENSOR VOLTAGE ADJUSTMENT: The ST360 Series has been factory set to 2.0V, the ST350 is set to 2.7V. The sensor operating voltage is applied to the R and A terminals of TB1 (see FIGURE 4.1).

  • Page 20: Balance Adjustment

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter 4.2.2 BALANCE ADJUSTMENT: Differences in element resistance from sensor to sensor necessitate a BALANCE adjustment, which simply matches a particular sensor to the ST Series input bridge circuit. This adjustment should only be made when a sensor is initially wired to the ST Series I/O PCB.

  • Page 21: Sensor Fault Supervision

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter Determining what gain value is required for the application may be determined either by applying a known value of gas and configuring JP1 for the correct voltage on the VOUT test point, or, by reviewing the sensor’s mV output specification and predicting the correct gain.
  • Page 22 Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter VOUT ST-46EC I/O RIBBON CABLE TO CPU ASSY. VOLTS ST-46LEL I/O PCB FOR CATALYTIC BEAD SENSORS FIGURE 4.2 - 19-...

  • Page 23: Section V

    MODEL ST200 & SERIES GENERAL DESCRIPTION: The Model ST200 & Series accepts electrochemical sensors directly, without the need of other transmitters or electronics. The micro-amp output from the sensor is converted to a 0.4-2 volt level by an ultra-stable pre-amplifier on the EC I/O PCB.

  • Page 24: Sensor Response Coefficient

    ST Series or any other electronic enclosures. 5.2.1 SENSOR RESPONSE COEFFICIENT: Jumper header JP2, located on the I/O PCB, allows the ST200 Series to be configured to accept either positive or negative coefficient sensors. JP2’s dual jumpers must both be placed in either the ‘A’ or ‘B’ positions. ‘A’ corresponds to a positive coefficient output sensor and ‘B’...
  • Page 25 Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter JP1 gain values are as follows: JP1 with jumper in position 1 = GAIN = 5.5 JP1 with jumper in position 2 = GAIN = 4 JP1 with jumper in position 3= GAIN = 2.3 JP1 with jumper in position 4 = GAIN = 1.5 JP1 with no jumper = GAIN = 1 More than one jumper may be installed to allow additional gain values.

  • Page 26: Sensor Fault Supervision

    Model ST Series Non-Intrusive Transmitter ELECTROCHEMICAL SENSOR FAULT SUPERVISION: The ST200 Series is equipped with fault detection circuitry, which detects a missing sensor. Within several minutes of removing an EC sensor, the ST200 Series transmitters will signal a FAULT condition. A FAULT is also detected if the sensor output drifts far enough negative to cause the 4-20 mA output to reach 2.4mA (-10% of full scale).

  • Page 27: Section Vi

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter SECTION VI OPTIONAL FEATURES GENERAL DESCRIPTION: Space is provided behind the front panel/CPU assembly to add a single circuit board adding features not provided on the standard ST Series. Field wiring should be an important consideration when determining if an option is required.

  • Page 28: Modbus® Rs-485 Serial Interface Option

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter ASSY 10-0127 AW 0010-1097 REV 0 RIBBON CABLE TO I/O PCB ISOLATED 4-20mA OUTPUT FIGURE 6.1: OPTIONAL ISOLATED 4-20mA OUTPUT MODBUS® RS-485 SERIAL INTERFACE OPTION: The Modbus RS-485 serial interface board allows up to 128 ST Series Transmitters to communicate to a Modbus master device on a single cable.

  • Page 29: Rtu Address

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter 6.3.1 RTU ADDRESS: The eight DIP switches allows a different RTU address be assigned to each ST Series. The 8 DIP switches represent an 8 bit binary number with 1 = LSB and 8 = MSB. For example, OFF, ON, ON, OFF, ON, OFF, OFF, OFF = 0110 1000 = RTU address 104.

  • Page 30: Latching Alarms

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter WARN HIGH O FF 60% (TRIP LEVEL) O FF O FF 30% (TRIP LEVEL) O FF O FF O FF O FF SELECT ONLY 1 TRIP LEVEL PER SWITCH Only one of SW1 and SW2’s 8 DIP switches may be ON for correct operation. In the example shown above, since SW2 #4 is ON, the WARN alarm will trip at 30% of full scale.
  • Page 31 Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter ASSY 10-0130 REV 0 AW 0010-1094 RIBBON CABLE TO HIGH I/O PCB ALARM 2 HIGH WARN NORM ALARM 1 FAIL NORM FAULT WARN LTCH SHORT TB4 TO RESET LATCHED ALARMS FIGURE 6.3: OPTIONAL ALARMS - 28-...

  • Page 32: Section Vii

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter SECTION VII CUSTOMER SUPPORT TECHNICAL SERVICE: Technical service can be obtained by contacting Armstrong Monitoring Corporation at (613) 225-9531 (800) 465-5777 (U.S. Toll Free) Fax (613) 225-6965 HEAD OFFICE: The Head Office of Armstrong Monitoring Corporation is located at 215 Colonnade Road.

  • Page 33: Section Viii

    Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter SECTION VIII PHYSICAL DIMENSIONS .25 D IA. 3/4" N PT T YP. 2 PLA CES TYP. 2 PLACES 6.10 6.10 5.50 5.10 4.55 FIGURE 8.1 - 30-...
  • Page 34 Armstrong Monitoring Corporation Model ST Series Non-Intrusive Transmitter ST-420 ADDENDUM This instruction manual addendum describes a special version of the ST series modified to accept 4-20mA transmitter inputs in lieu of sensors. Portions of the manual not specifically addressing sensors still apply to the ST-420. This allows the ST-420 to be mounted in series with the transmitting device in need of its non-intrusive calibration and readout features.

This manual is also suitable for:

St350St30

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