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1. NEGATIVE PRESSURE ENCLOSURE MONITOR UNIT HS EM1 USER MANUAL SMH Products Ltd South Shields Document Number HS EM1 User Manual Approved 20 03 15 _ Revision Number The Harley Scientific Negative Pressure Enclosure Monitor Unit HS EM1 User Manual Introduction The Harley Scientific Negative Pressure Enclosure Monitor Unit HS EM1 is a device for monitoring the air pressure relative to ambient in a permanent or temporary enclosure where it is desirable to maintain a small negative pressure difference in order to prevent the egress of undesirable gasses vapours or particulates from the enclosure The device features an organic light emitting diode OLED display to inform an operator as to the working status of the unit A keypad allows data entry of for instance alert thresholds An audible annunciator is also included Three Light Emitting Diode LED status indicators Red to indicate that the unit is powered Green and Blue indicate status of the internal Bluetooth module A set of volt free changeover relay contacts are available for connecting either an external remote sounder or an external telephone dialler The HS EM1 is principally a monitoring device however external equipment such as booster air handling units may be indirectly operated by means of a set of volt free changeover relay contacts available at a male connector on the front panel Wired communication with the unit may be executed by means2. cted and preferably pointing downwards to prevent debris from entering it Ensure that there is no potential for excessive leakage around the tubing s entry point into the enclosure Insert the power lead into the receptacle and connect the other end of the power lead to a suitable supply 100 240V Switch the unit ON by depressing the small rocker switch below the power entry connector The audible alarm will sound for several seconds If the measured pressure is below a previously set alert threshold it will persist and must then be silenced by pressing the RETURN KEY E It is assumed that the unit has already been pre set using a computer communicating through the USB port with the following parameters ALERT set to 20Pa and the mode is NOT FIXED TIME and DATE Language ENGLISH The OLED display screen will show Approximately every ten seconds the display will blink and show LT TTT TTT TT tT ERRE aff SERRE E Heren LEJ This confirms that the current data has been saved to memory See Harley Scientific EM1 Software Guide for instructions how to use the unit with a computer Adjusting the ALERT Set Point The ALERT set point can be adjusted by a suitably qualified operator by using the UP and DOWN buttons To raise the set point under normal operation repeatedly press the UP 4 key until the desired value is displayed on the OLED Conversely to lower the set point pres
3. d correctly but the protective bung has not been removed from the other port The unit will operated with the specified accuracy provided that the total length of tubing ie the sum of the length of tubing from the enclosure together with any tubing connected to the reference port does not exceed 5m If it is desired to use lengths of tubing in excess of this then it is advisable to connect using larger bore tubing for the main lengths and a suitable tubing size adaptor close to the HS EM1 In the unlikely event that the mains input fuses are blown after examining the unit for water ingress replace with a pair of new 3 15 AMP 20mm fuses The fuses are located in a draw within the IEC Mains Input connector switch unit If the target air pressure values cannot be adjusted using the front panel push buttons it is possible that the unit has been set to FIXED mode to prevent unauthorised access to these controls This status can only be returned to NOT FIXED by attaching a computer to the USB port and running the dedicated software See Harley Scientific EM 1 Software Guide for instructions how to use the unit with a computer Front Panel Layout External Sounder Connector Air Unit IEC Power Inlet Cable storage E E Fuses ON OFF Switch Display Keyboard E Service and Technical Support Refer all technical support to the manufacturer SMH Products Maxwell Street South Shields NE33 4PU UK http smhprod
4. of a USB connection to a connected lap top computer Also the unit includes a wireless Bluetooth module allowing communication to a remote printer unit The unit is powered form a mains line source and is tolerant of wide variation in the supply voltage A convenient aperture is included for storing the mains cable lead when not in use In normal operation the unit is installed outside the monitored enclosure A small bore tube connects the unit to the negative pressure enclosure by inserting its distal end through a suitable aperture in the enclosure An operator adjustable programmed Alert set point initially requires setting to an appropriate pressure differential value in Pascals which if crossed activates the audio annunciator and causes both relays to switch state The date and time of such an event is internally logged for later analysis Please note that when switching on the unit for the first time and with no pressure present an ALERT condition is likely to be asserted and this can be immediately accepted by pressing the Return Key lt Starting Up Choose a suitable location to position the unit close to an available mains power supply and within 10m max of a suitable place to pass tubing into the enclosure to be monitored Connect the 6mm OD tubing to the negative input push fit connector on the unit Ensure that the distal end of the tubing within the enclosure is positioned so that it cannot be obstru
5. ressing the small rocker switch below the power entry connector Using the Optional Bluetooth Printer A small hand held printer may optionally be provided to offer hard copy of the unit s event log The unit is designed to connect using the Bluetooth communications protocol To print Turn the printer ON Simultaneously PRESS the PRINTER key AND the ACCEPT key The OLED displays the message PTT RIS ejmyt I T A Bh uleltiolo itih Islelair icih Irlolri Wert in LEUU PN elals lel Iwal It When it finds the printer Cloln lr HATE etalstel baste tL LT Within the next five seconds the printer will respond and print the most recent 32 events in the log During the print operation the Blue LED will flash to indicate successful connectivity Using the External Relay Connectors an All three volt free contacts from the respective relays associated with an external Air Handling Unit and External Sounder which may also be used to attach to an external Telephone Dialler are available at a pair of Bulgin connectors The wiring of the connector is as shown in the diagram In normal operation the relays are de energised The maximum ratings for these relay contacts are 240V and 3A including A surge Note that these connectors are not internally fused N O N C Calibration The HS EM1 internal pressure sensors are factory calibrated and in normal operating condi
6. s the DOWN key The set point can be adjusted in the range 0 to 60Pa Note Using the EM 1 s PC software application it is possible to lock out the keypad preventing unauthorised modification to the alert levels Action in an ALERT condition In the event that the pressure within the enclosure drops below the ALERT set point The sounder will activate The relay contacts accessed through the External Sounder Remote Dialler Connector will change state The relay contacts accessed through the Air Handling Unit Connector will change state Responding to an ALERT condition Operation of the ACCEPT button will result in The sounder will be silenced The relay contacts accessed through the External Sounder Remote Dialler Connector will return to the original state The relay contacts accessed through the Air Handling Unit Connector will remain in their changed state Subsequent elevation of the pressure within the enclosure above the ALERT set point will result in The sounder continuing to activate until ACCEPT pressed unless already pressed The relay contacts accessed through the External Sounder Remote Dialler Connector will continue in the change state until ACCEPT pressed unless already pressed The relay contacts accessed through the Air Handling Unit Connector will change state reverting back to the normal condition Shutting Down When the monitoring process ceases to be required simply switch the unit OFF by dep
7. tions no adjustments are necessary However there is a requirement for the sensors to be checked and if necessary re calibrated on an annual basis To remind the user of this requirement a message Not Calibrated will be displayed on the OLED display after twelve months from shipment Nott Iclal rlaltlela I T SEC ECE In addition this screen will display the Not Calibrated message in the unlikely event that an internal fault has developed within the unit If this happens press the Return Key to clear it Warnings A Warning The voltages used in this unit can cause electric shock The unit should not be placed in a position where it could be immersed in water A Warning It is possible to apply external voltages to this unit that could cause electic shock Attaching external equipment to the Air Handling Unit relay connector or the External Sounder Autodialler relay connector must only be performed by a suitably qualified person The maximum voltage that can be applied to any of the pins on these connectors must not exceed 240V when measured relative to the unit s earth connection Maximum Current is 3A Troubleshooting The HS EM1 has been designed to be easy to use however some simple problems may arise The message Positive Pressure on the display indicates that the tube connection from the enclosure has been fitted to the wrong port Alternatively it may have been fitte
8. ucts com Declaration of Conformity We SMH Products Maxwell Street South Shields NE33 4PU UK declare under our sole responsibility that the product identified as HS EM1 Enclosure Pressure Monitor to which this declaration relates is in conformity with the following standards EN 61000 6 2 2005 Electromagnetic compatibility EMC Part 6 2 Generic standards Immunity for Industrial Environments EN 61000 6 3 2007 A1 Electromagnetic compatibility EMC Part 6 3 Generic standards Emission standard for residential commercial and light industrial environments EN 61000 3 2 2006 A2 Electromagnetic compatibility EMC Part 3 2 Limits Limits for harmonic current emissions equipment input current lt 16A per phase EN 61000 3 3 2008 Electromagnetic compatibility EMC Part 3 3 Limits Limitation of voltage changes voltage fluctuations and flicker in public low voltage supply systems for equipment with rated current lt 16 A per phase and not subject to conditional connection and the Low Voltage Directive EN 61010 1 2010 corrigendum May 2011 Safety requirements for electrical equipment for measurement control and laboratory use Issued South Shields 20 03 2015
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