manualshive.com logo in svg

BIOS dry-cal dc-lite, Руководство пользователя, Страница: 7 / 10

Поделиться
Скачать
BIOS dry-cal dc-lite Скачать руководство пользователя страница 7

8.0  Isolating the DryCal from Other Instruments

The DryCal DC-Lite will mimic the flow source being used. Therefore, if the flow

source exhibits flow pulsation, Bios recommends the use of an isolation device.

Use of a 25mm, 0.8m filter cassette creates a suitable backpressure for most flow 

rates used in industrial hygiene applications. This smoothes the slight pulsation

caused by the stroke of the sampling pump’s piston, allowing for more stable 

DC-Lite flow readings.

In addition to flow source pulsation, the closure of the DC-Lite's valve at the 

beginning of each flow reading inserts a small pressure spike into the flow stream.

Generally, the pressure spike is negligible. However, it may interact with some

instruments (such as some mass flow controllers). A common solution is to isolate

the DryCal with a restriction as described in Sections 8.1–8.4

8.1  Use with Instruments that Contain Internal 
Mass Flow Controllers (MFCs)

For some flow instruments with MFCs and large internal dead volumes (such as

some PM 2.5 monitors) results may not correlate between the instrument and the

DryCal, for the reasons describe in Section 8.0. To eliminate these discrepancies,

Bios offers an active regulation device, part DC-IR-H, to provide a constant 

insertion pressure that renders the DC-Lite’s pressure spike negligable.

8.2  Use with Personal Air Samplers

The DC-Lite may be used to verify the flow rate of personal air samplers. Due to

flow source pulsation, to ensure accurate calibrations Bios recommends the use of

an isolating flow restriction, as described in Section 8.0. When placed in-line

between the sampling pump (flow source) and the DC-Lite, a standard MSHA-

approved respirable dust filter or equivalent should provide sufficient flow 

source isolation. 

11

7.1  Charging the Battery

Before using your DryCal DC-Lite, be sure that the battery system has been fully

charged to ensure that unit will perform without interruption. Using the DC-Lite

with a low battery will not affect the product’s accuracy, but may affect the 

valve performance.

The DC-Lite is equipped with a battery indicator that provides battery charge 

indication at three levels. When the battery indicator on the display is empty the

unit will continue to operate for a limited period of time before shutting down. 

To Charge the DC-Lite

To view the actual charging status during the charging period, disconnect the 

battery charger and wait 3–5 minutes. When the indicator is solid black the battery

is fully charged. Bios recommends leaving the DC-Lite on charge when not in use

to prevent battery degradation. 

1

Connect only the appropriate Bios 12 VDC charger, provided with the DC-Lite 

calibrator, into a standard wall outlet. 

2

Insert the charger barrel plug into the charging jack located on the right side 

of the DC-Lite housing above the inlet and outlet ports. A green Charge LED 

will illuminate while the unit is charging. Full charge takes 8–12 hours, and 

the DryCal can be used while charging.

7.2  Battery Maintenance & Storage

The DC-Lite’s lead-acid battery will not exhibit the memory effect common to

nickel-cadmium batteries. It may be left on charge for an indefinite time period 

without damage. 

Long-term storage without charging can damage the battery pack, 

therefore if the DC-Lite cannot be left charging continuously, it should be

fully charged at least once every three months and should be placed in

storage only after achieving a full charge.

10

Содержание dry-cal dc-lite

Страница 1: ...rporation 10 Park Place Butler New Jersey USA 07405 Phone 973 492 8400 Toll Free 800 663 4977 Fax 973 492 8270 Email sales drycal com Web www drycal com 2004 Bios International Corporation MK01 1 Rev D DryCal DC Lite Manual ...

Страница 2: ... 25 H x 5 W x 2 75 D 133 mm H x 127 mm W x 70 mm D Weight 42 oz 1200 g Flow Ranges Air Flow Accuracy Specifications based on averaged readings Lower limit is based on self tested maximum leakage Model Optimum Flow Range 1 Extended Flow Range L 10 ml min 500 ml min 1 ml min 500 ml min ML 50 ml min 2 L min 5 ml min 5 L min M 100 ml min 7 L min 10 ml min 12 L min MH 200 ml min 20 L min 20 ml min 20 L...

Страница 3: ...ite at www drycal com for the most current product specifications For use with clean laboratory air or other inert non corrosive gasses only 4 0 General Description The DryCal DC Lite is a field portable primary flow calibrator used for industrial hygiene environmental and laboratory flow measurement applications Using patented near frictionless dry piston technology it combines the accuracy of a ...

Страница 4: ... which implies a known volume yields the volumetric flow as q v t π r2 h t Where q volumetric flow rate v measurement volume t measurement time r radius h measurement path length This piston prover would be as accurate as its physical dimensions and its clock with almost insignificant drift mechanisms Although such idealized devices do not exist we believe the DryCal offers close to ideal performa...

Страница 5: ...ts to test compatibility 7 6 3 Disabling Re Enabling the 5 Minute Auto Shutoff Feature 5 minute auto shutoff is the default setting for the DC Lite This feauture can be disabled if your application requires a longer standby time The 5 minute auto shutoff feature must be disabled each time the unit is powered on or reset Please note that the DC Lite s protective circuitry prevents the battery from ...

Страница 6: ...be charged indefinitely using the AC wall adapter provided Although the DC Lite may be plugged into AC power if the battery is exceptionally weak the DC Lite may not function Please read all setup and charging instructions indicated in this manual before using equipment 9 Print Setup 1 Turn the DC Lite on before connecting the printer cable to avoid Nexus Control 2 Turn on the flow source and conn...

Страница 7: ...p flow source and the DC Lite a standard MSHA approved respirable dust filter or equivalent should provide sufficient flow source isolation 11 7 1 Charging the Battery Before using your DryCal DC Lite be sure that the battery system has been fully charged to ensure that unit will perform without interruption Using the DC Lite with a low battery will not affect the product s accuracy but may affect...

Страница 8: ...the display will read Test OK Press Read 7 Press the Read button and the internal valve will open allowing the piston to fall any remaining distance to the very bottom of the cell 8 Repeat this test with the leak test accessory connected to the outlet port lower port 13 8 3 Calibrating Rotameters When calibrating rotameters the DryCal DC Lite should be used as a transfer standard only Do not use t...

Страница 9: ...et fitting depending on model ordered Older DC Lites sent to Bios for calibration will be retrofitted with these inlet filters free of charge However air containing cigarette smoke excessive dust or other particulates should be additionally pre filtered A particulate filter part AF 516 is available for this purpose The filter should be placed ahead of the DryCal in the flow stream on the inlet sid...

Страница 10: ...ng instrument the device under test such as your DC Lite and the corresponding values of a standard In other words to calibrate is to check or determine the validity of a measuring instrument by comparison with a standard Calibration may also include adjustment to restore the device under test to its original specification although adjustment is not possible with a DryCal because of its primary na...

Отзывы:

Нет отзывов