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MST 5700 Owner's Manual

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MST, INC.
MODEL 5700
MICROPROCESSOR
MONITOR
OWNER'S
MANUAL
IMPORTANT WARNING
WHEN THE CO MONITOR IS CORRECTLY INSTALLED AND
MAINTAINED, IT MONITORS THE LEVEL OF CARBON
MONOXIDE IN THE RESPIRATORY AIR LINE. THE MONITOR
DOES NOT
REMOVE CARBON MONOXIDE FROM THE AIR
2/12

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  • Page 1 MST, INC. MODEL 5700 MICROPROCESSOR MONITOR OWNER’S MANUAL IMPORTANT WARNING WHEN THE CO MONITOR IS CORRECTLY INSTALLED AND MAINTAINED, IT MONITORS THE LEVEL OF CARBON MONOXIDE IN THE RESPIRATORY AIR LINE. THE MONITOR DOES NOT REMOVE CARBON MONOXIDE FROM THE AIR...

  • Page 2: Table Of Contents

    MODEL 5700 SPECIFICATIONS MST, INC. MODEL 5700 CARBON MONOXIDE MONITOR AND ALARM RANGE: 0-199 PPM CO SERIAL NUMBER: INITIAL ALARM SETTING: U.S.: 10 PPM CO POWER: 9 V ALKALINE BATTERY Canada: 5 PPM CO (Transistor type) - 2 each DETECTOR TYPE: ELECTROCHEMICAL CELL CONTENTS INTRODUCTION .

  • Page 3: Introduction

    MODEL 5700 I. INTRODUCTION The MST, Inc. Model 5700 Carbon Monoxide (CO) Monitor and Alarm is a side mounted, battery powered unit. The monitor has been designed, and is certified by the Canadian Standards Association (CSA LR-104195) to be INTRINSICALLY SAFE FOR USE IN CLASS 1, DIVISION I, GROUPS A,B,C&D when used with two “9V”...

  • Page 4: Detailed Description

    MODEL 5700 II. DETAILED DESCRIPTION General descriptions of each of the items mentioned in the previous section are provided below. Their functions are indicated in Section III, OPERATION. FRONT PANEL ON/OFF/TEST Switch This switch is a three-position type with alternate ON and OFF positions, and a momentary TEST position.

  • Page 5: Low Battery Light

    MODEL 5700 LOW BATTERY Light Amber LOW BATTERY light comes on when battery voltage falls to where the instrument will not function properly (about 7. 0V). Batteries should be replaced at this time. NORMAL Light The green NORMAL light acts as a pilot light and glows when the instrument is turned on.

  • Page 6: Auxiliary Power Jack

    MODEL 5700 Auxiliary Power Jack A 2.5 mm pin jack is located near the bottom for operating the instrument from an auxiliary 12 V battery or from a Continuous Operation Adapter (COA). An auxiliary battery will extend the time of operation considerably, and the COA will power the instrument as long as power is supplied to it.

  • Page 7: Normal Operation

    MODEL 5700 Remove the zero air sample and introduce a known sample of 50 to 150 ppm CO to the sample inlet tube. The sample flow should be between 0.5 and 1.5 SCFH. Verify that the display readings rise upscale and the alarm light and buzzer operate (See Calibration and Adjustment, IV.

  • Page 8: Det Ect Or O Pen Circu It

    MODEL 5700 At 5.8 volts the buzzer will beep at 1-second intervals and the display will go to --. This malfunction indication will continue until the battery is completely dead. Detector (cell) open circuit If there is a discontinuity in one or more of the detector leads, or internal to the...

  • Page 9: Calibration And Adjustment

    MODEL 5700 IV. CALIBRATION AND ADJUSTMENT After each adjustment in the following steps, allow time for the changes to stabilize. Recheck all adjustments. Turn instrument on and allow at least 5 minutes warm-up before calibration and adjustments are made. ZERO ADJUSTMENT Remove sample inlet tube from sample metering valve outlet fitting and introduce a sample of zero air or nitrogen, free of “CO”...

  • Page 10: Maintenance

    MODEL 5700 Set the display reading to the desired alarm level with the ZERO potentiometer. Turn the ALARM potentiometer clockwise until the alarm just activates. Check the setting by turning the ZERO potentiometer CW and CCW to cause the instrument to go into and out of alarm. Observe display to confirm alarm setting level.

  • Page 11: Main Circuit Board

    The wires can then be unplugged from their sockets along the edge of the board. The board can then be sent to MST, Inc. for repair or exchange.

  • Page 12: Other Components

    Intrinsic Safety of instrument. REPAIR For repair of other components, it is recommended that you call your local distributor or MST @ 1-800-542-6646 or 1-888-MOD-SAFE. VI. ACCESSORIES ALARM REPEATER - P/N 80444 This accessory is a piezoelectric audible alarm (85 dB (A) at 1 Ft.) with a 6 Ft.
  • Page 13 MODEL 5700 CONTINUOUS OPERATION ADAPTER (12 VDC) - P/N 80123 This accessory will allow the use of an external 12 volt DC battery, such as an automotive or compressor battery, to provide continuous operation of the instrument. Care must be taken to observe that the proper voltage (12 VDC) and polarity (Red clip is positive, Black clip is negative) is maintained.

  • Page 14: Parts List

    MODEL 5700 VII. PARTS LIST The following is a list of optional accessories and items that would most likely need replacement during the life of the instrument. Identifier Description 80052 Normal light, green 80053 Alarm light, red 80081 Low battery light, amber...

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