Brooks Instrument BM50 - Manual (Page 55)

4-7
Section 4 Maintenance
BM Oval Series
Installation and Operation Manual
X-PD-BM-Ovals-eng
Part Number: 541B031AAG
January, 2009
To extend battery life it is advised to disable unused functions.
Check periodic:
• The condition of the casing and front panel.
• The wiring of components for reliability and ageing symptoms.
• The process accuracy. As a result of wear and tear, re-calibration of the
flowmeter might be necessary. Do re-enter any subsequent K-factors
alterations.
• The indication for low-battery.
• Clean the casing with soap-water; don’t use any aggressive solvents as
these might damage the polyester coating.
Technical Specifications General:
Display: High intensity reflective alphanumeric LCD, UV-resistant.
Digits: Seven 17mm (0.67") and eleven 8mm (0.31"). Various symbols and
measuring units.
Refresh rate: Selectable via menu: 8 times/sec - 30 sec’s.
Window: Polycarbonate window.
Control keys Three industrial micro-switch keys. UV-resistant polyester
keypad.
Operating temperature: -20°C to +70°C.
Power requirements: 8-30 Vdc supply can be connected to power the unit.
Option PA: Internal Lithium battery 3.2 Vdc: average lifetime seven years
dependent upon settings and sensor type.
Sensor excitation: Same voltage as offered to power the unit.
Terminal connections: Removable plug strip. Wire max. 1.5mm2.
Data protection: EEPROM backup of all setting. Backup total and
accumulated total every minute.
Environment CE: EMC compliant ref: EN50081 and EN50082.
Pulse inputs: Type P: NPN, reed-switch,
Frequency: Minimum 0 Hz - maximum 7 kHz for total and flowrate. Max
frequency depends on signal type and internal low-pass filter, see Section
3.2.3.5. Reed switch with low-pass filter = max. 120 Hz.
Low-pass filter: Available for all pulse signals.
Selection main function: Total or Flowrate will be displayed with 17mm
digits.
Operator Functions
General: The Operator has three functions available:
- TOTAL and Flowrate are displayed.
- TOTAL can be reset by pressing CLEAR-key twice.
- After pressing SELECT, Accumulated TOTAL will be displayed.
TOTAL: 17mm character-size - 7 digits. Measuring units: L, m3, GAL,
USGAL, KG, lb, bbl, no unit. K-factor: 7 positions 0.000010 - 9,999,999.
Number of decimals: max. three. TOTAL is resetable.
Accumulated Total: 8mm character-size - 11 digits. Acc. Total is not
resetable. Uses the same K-factor, unit and decimals as TOTAL.