User manual ROTOTHERM DIGIGAUGE DIGITAL PRESSURE GAUGE

[. . . ] Fittings and hardware : To allow the gauge to be removed easily for servicing and calibration it is recommended that a service valve is placed in the pressure line immediately before the DigiGauge. This service valve, together with other fittings and hardware should be of an appropriate pressure rating. If pressure surges are likely to occur it is advisable to fit a pressure limiting device such as a snubber. Use a siphon tube or 'pig-tail' to isolate the gauge from high temperature pressure media. [. . . ] The DigiGauge display will then alternate between the maximum and minimum values as long as the magnet is held in place. The maximum pressure is shown after the display message Hi and the minimum value follows Lo. To reset (clear) the minimum and maximum values : Place a bar magnet on the top left-hand side of the case within the box marked Min-Max Clear on the instrument label. After approximately 5 seconds the minimum and maximum values will be cleared, confirmed by the display message HiLo CLrd. Setup Mode The gauge has a set-up mode which may be used for the following:· Set the full scale pressure range. · Clear the stored instrument zero value · Clear the stored instrument linearisation value Three pushbutton switches, SW5, SW6 and SW7, are used when programming the gauge. To gain access to these switches, which are located to the right of the display, the bezel and dial must first be removed. When entering a value, the currently stored value is recalled from memory and written to the display. Entering the setup mode Hold down the UP and DOWN pushbuttons (SW7 and SW5) for approximately 5 seconds, the gauge will then enter the setup mode which will be confirmed by the display message SET UP. The SET UP message will be replaced by the following menu:- FS - CLr. Z - CLr. L - End. Press UP (SW7) to advance through the menu. When the required function is displayed, press ENTER (SW6) to select it. The various functions are described below. FS : Set the full-scale pressure range The full-scale pressure range is equal to that of the pressure sensor. It is set during manufacture and should not be changed in normal operation. CLr. Z 1. 4. : Clear the display zero value Using the UP pushbutton switch (SW7) scroll through the setup menu until the display shows CLr. Z Move DIL switch SW4 to its 'ON' position Press the ENTER pushbutton (SW6). The display will show the message donE which indicates that the zero value has now been cleared from the gauge. 4. Using the UP pushbutton switch (SW7) scroll through the setup menu until the display shows CLr. L Move DIL switch SW3 to its 'ON' position Press the ENTER pushbutton (SW6). The display will show the message donE which indicates that the linearisation value has now been cleared from the gauge. : End setup End Terminates the setup mode of operation and restarts the gauge in the normal measurement mode. DigiGauge Digital Pressure Gauge Instruction Manual Page 4 Calibration Each DigiGauge instrument is fully calibrated during manufacture and certificates of calibration may be requested at time of ordering. It is recommended that the calibration of the gauge should be checked against a known standard every 12 months or at intervals specified by relevant quality assurance procedures. British Rototherm offers a rapid in-house recalibration service for its pressure measurement products, traceable to national standards. Note that calibration is made easier by operating the gauge at the 0. 5 second update rate which allows adjustments to be made more quickly. To zero the gauge 1. [. . . ] Hold down push button switch SW6 until the display reads St. LP then release switch SW6. Hold down push button switch SW6 until the dis play reads St. Ln then release switch SW6. Return DIL switch SW3 to the OFF position and SW1 & SW2 to their original positions. The compound gauge is now correctly linearised. DigiGauge Digital Pressure Gauge Instruction Manual Page 5 Warranty The Rototherm Digital Pressure Gauge is guaranteed to be free of manufacturing defects for a period of one year from the date of purchase. [. . . ]