User manual FLUKE A70M

[. . . ] RPM4/HPMS A70M/A20M-AFTM Reference Pressure Monitor with High Pressure Mounting System Operation and Maintenance Manual NSN 6685-01-529-6990 RN (2 of 3) © 2007 DH Instruments, a Fluke Company RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL High pressure liquids and gases are potentially hazardous. Energy stored in these liquids and gases can be released unexpectedly and with extreme force. High pressure systems should be assembled and operated only by personnel who have been instructed in proper safety practices. This instrument is not to be operated in any other manner than that specified by the manufacturer. © 2007 DH Instruments, a Fluke Company All rights reserved. Information in this document is subject to change without notice. No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of DH Instruments, a Fluke Company 4765 East Beautiful Lane, Phoenix AZ 85044-5318, USA. [. . . ] OPERATION To customize the [UNIT] function key, press [SPECIAL], <6PresU> from the MAIN RUN screen. The display is: 1. Entry field to specify which unit position (1 to 6) of the [UNIT] function key menu is to be changed. Set up unit #6 Enter the number of the unit position that you would like to change. The display becomes: Unit#6 1SI 2other 3altitude 4user Select the desired pressure unit category (SI units include units based on SI units such as mmHg), then select the desired unit from the unit menu. UNIT function - available units of measure <1SI> <1Pa> <2hPa> <3kPa> <4MPa> <5mbar> <6bar> <7mmHg> <8mmWa> <2OTHER> <1psi> <2psf> <3inHg> <4inWa> <5kcm2> <3ALTITUDE > Not available in this RPM4 model <4USER> If <4user> is selected, the user unit must be defined. The display is: Define user unit: 1. 000000 unit/Pa 1. Entry field. Enter the number of user units per Pascal (Pa) in the entry field. Pressing [ENT] defines the user unit and returns to the <Set up unit #n> screen. The user defined unit label can be customized to any alphanumeric, four character label using the remote command "UDU" (see Section 4. 4. 4). See Section 7. 1. 1 for the pressure unit conversion factors used by RPM4. 3. 5. 7 <7INTERNAL> PURPOSE To view, set, adjust, and maintain various aspects of RPM4's internal operation. OPERATION To access the internal selections press [SPECIAL], <7internal>. The display is: 1baro 2ReadRt 3RPT2x 4lo vnt 5log © 2007 DH Instruments, a Fluke Company Page 66 3. OPERATION The INTERNAL menu choices include: <1baro> <2ReadRt> <3RPT2x> <4lo vnt> <5log> View the real time output of the RPM4 on-board barometer (see Section 3. 5. 7. 1). Turn ON and OFF RPM4's automated, rate of change dependent, reading and integration and display rate feature (see Section 3. 5. 7. 2). View the RPM4 incident log (see Section 3. 5. 7. 5). 3. 5. 7. 1 <1BARO> PURPOSE To view the value of atmospheric pressure as measured by the RPM4 on-board barometer. The atmospheric pressure measurements made by the on-board barometer are used for dynamic compensation of atmospheric pressure when making gauge pressure measurements (see Sections 3. 2. 2, 3. 3. 3, PRINCIPLE). See Section 5. 4, 4 Figure 13 and Section 5. 4. 5, Figure 14 for a photo and schematics showing the position of the on-board barometer in RPM4. The on-board barometer is a low accuracy sensor used only for measuring small changes in atmospheric pressure over short periods of time (see Section 3. 2. 2). RPM4 measurement uncertainty does not depend on the measurement uncertainty of the on-board barometer. OPERATION To view the current reading of the on-board barometer press [SPECIAL], <7internal>, <1baro>. The display is in the active pressure unit of measure (see Section 3. 3. 2). The display resolution is fixed to 0. 1 Pa, or its equivalent. 3. 5. 7. 2 <2READRT> PURPOSE To turn ON and OFF RPM4's automated, rate of change dependent, reading integration and display rate feature. PRINCIPLE To obtain maximum resolution from RPM4 Q-RPT pressure measurements, an integration time of about 1. 2 second per reading is used. In most situations, maximum precision is needed when pressures are stable so a relatively slow display update rate presents no disadvantage. However, when pressure is changing quickly, more rapid pressure updates are usually more important than obtaining maximum precision on individual readings. The RPM4 read rate function automatically adjusts pressure measurement integration time depending on the rate of change of pressure. [. . . ] In an RPM4 with two Q-RPTs, the Q-RPT that is not currently displayed on the top line of the display. The inactive Q-RPT may be displayed on the second line of the RPM4 display using the Q-RPT DISPLAY function. The designation of a the Q-RPT with the lower full scale default range in RPM4s with two Q-RPTs. Whether pressure is being measured relative to absolute zero or vacuum (absolute mode) or relative to atmospheric pressure (gauge mode). [. . . ]