BRECHTEL 3110 Manual de usuario

Instrument Manual

PRE-HUMIDIFIER 3110

83-00029-01

September 13, 2017

Pre-Humidiﬁer 3110

Contents

1 Changes 2

2 Unpacking 3

3 Pre-Humidiﬁer Overview 4

4 Installation 5

4.1 Power Connections .......................................... 5

4.2 Instrument Rack Mounts ....................................... 5

4.3 Compressed Air Connection ..................................... 5

4.4 Sample Flow Connections ...................................... 6

4.5 Humidiﬁcation Control System ................................... 6

5 Pre-Humidiﬁer Operation 7

5.1 Operation Overview ......................................... 7

6 Pre-Humidiﬁer Speciﬁcations 8

7 Appendix 9

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Pre-Humidiﬁer 3110

1 Changes

Change Description Page Date Authorized By:

First Draft N/A 9/12/2017 FJB

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Pre-Humidiﬁer 3110

2 Unpacking

Each Brechtel Manufacturing Pre-Humidiﬁer is inspected and tested in-house at Brechtel Manufacturing

to ensure out of the box operation upon delivery. Prior to opening, inspect the packaging container and

ShockWatch impact indicator.

Carefully open the package and inspect the instrument and accessories for broken parts, scratches, dents

or other signs of damage incurred during shipping.

Notify BMI within 2 days of receiving package if the shock indicator (Fig 1) has activated and/or of

any other visible damage

Verify the contents of the shipment with the unpacking instructions, which are enclosed inside the packaging

and available as a PDF ﬁle.

Retain all shipping packaging, foam inserts and cushions to ensure a safe delivery should the in-

strument need to be returned.

Figure 1: The black lines in the bottom image indicates the package has experiences an impact.

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Pre-Humidiﬁer 3110

3 Pre-Humidiﬁer Overview

The Brechtel Manufacturing Pre-Humidiﬁer is a simple device designed to bring a particle sample ﬂow to a

known relative humidity. The Pre-Humidiﬁer can be implemented as a component of a suite of instruments,

in particular the Model 3100 HTDMA, to explore the humidity dependence of particle size, efﬂorescence,

deliquescence, and other properties. The unit is typically operated by controlling mixing dry and water sat-

urated air ﬂows inside a small metal box containing 24 inches of naﬁon tubing. The sample ﬂow is drawn

through the instrument by a user supplied vacuum and the RH of the ﬂow near the sample exit can be read

using the display on the chassis front panel. By changing the ratio of wet and dry air ﬂows, the RH of the

ﬂow can be changed.

Figure 2: Front view of the Pre-Humidiﬁer chassis.

The data from aerosol humidiﬁcation studies are used to understand the air quality, climate and human

health impacts of aerosols. The unit can also be used in a routine air-monitoring mode at urban and remote

ﬁeld sites to continuously measure the ambient aerosol efﬂorescence and deliquescence cycles as part of

the BMI HTDMA.

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Pre-Humidiﬁer 3110

4 Installation

The Brechtel Manufacturing Pre-Humidiﬁer is operational out of the box with only minimal additional assem-

bly. Attach the water bottle mounting bracket to the rear panel of the chassis and ﬁll the water bottle with

distilled water. Insert the vent tube into the hole in the top of the water bottle to allow proper water ﬁlling.

Connect the water bottle supply tube to the ’Water Fill’ panel mount connector on the rear panel so water

ﬂows into the chassis. The sections below describe how to conﬁgure the Pre-Humidiﬁer for your speciﬁc

environment.

Figure 3: View of the Pre-Humidiﬁer Water Fill Bottle mounted to rear panel of chassis.

4.1 Power Connections

Power is supplied to the back panel of the Pre-Humidiﬁer from a 100-240VAC supply. The unit automatically

adjusts to the input AC voltage.

4.2 Instrument Rack Mounts

The Brechtel Manufacturing Pre-Humidiﬁer is able to mount into a 19 inch instrument rack using the built-in

rackmount ears on each side of the chassis.

4.3 Compressed Air Connection

The push-lock ﬁtting on the rear of the Pre-Humidiﬁer and is used to supply clean compressed air at beteen

5 and 15 psig during operation. The ﬁtting accepts 1/4” outside diameter tubing. The total air ﬂow rate

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Pre-Humidiﬁer 3110

required varies depending on desired RH set points but typically is less than 5 lpm. A ﬁlter inside the

chassis removes particles from the compressed air ﬂow before the needle valves.

Figure 4: Rear view of the Pre-Humidiﬁer chassis.

4.4 Sample Flow Connections

The 1/4” sample inlet and outlet ﬁttings are made from stainless steel. Connect to the inlet and outlet ﬁttings

using electrically conductive tubing. The Pre-Humidiﬁer is optimized to humidify sample ﬂow rates less than

1 lpm, the higher the sample ﬂow rate, the lower maximum RH that can be reached.

4.5 Humidiﬁcation Control System

The RH control system is completely contained within the chassis and requires no user installation. Ensure

the water bottle is full so water is provided to the unit.

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Pre-Humidiﬁer 3110

5 Pre-Humidiﬁer Operation

5.1 Operation Overview

Two manual needle valves are provided on the front panel to control the dry and wet air ﬂow rates that

mix together to create the desired sample ﬂow RH. The wet ﬂow is created using a 36” long naﬁon tube

submerged in a water bath maintained at 40◦C . Dry compressed air enters the naﬁon tube in the water

bath and becomes saturated with water vapor.

When attempting high RH operation, be sure to tightly close the Dry Flow valve to limit the amount of dry

ﬂow supplied to the sample humidiﬁer.

The saturated air ﬂow from the wet bath is mixed with a dry air ﬂow and the mixed ﬂow is delivered to a

second box housing another 24” coil of naﬁon. The particle sample ﬂow is passed through the 24” long

naﬁon. By manually adjusting the ratio of dry and wet air ﬂow rates, different RH values can be attained.

Because of the nature of the naﬁon tubing, the system is relatively slow response, be sure to wait several

minutes after making changes to the air ﬂow rates to determine the change in RH. An RH sensor monitors

the RH of the sample ﬂow just before the exit port on the front panel. The RH sensor reading is displayed

on the front panel.

Warning: Operating the Pre-Humidiﬁer at RH above 80% over long periods of time (days) can possibly

result in water condensation inside the sample ﬂow naﬁon box. To operate under dry conditions, dry air ﬂow

may be required for a substantial amount of time to evaporate any liquid condensate.

Figure 5: Front view of the Pre-Humidiﬁer chassis.

Connect your aerosol instrument to the sample ﬂow out port of the Pre-Humidiﬁer . In the case of the

Brechtel Model 3100 HTDMA, the Pre-Humidiﬁer is installed between the SEMS and HSEMS so that the

dry monodisperse ﬂow from the SEMS, after the MCPC ﬂow splitter, is attached to the Pre-Humidiﬁer

sample ﬂow in port. The sample ﬂow out port of the Pre-Humidiﬁer is connected to the HSEMS sample

ﬂow in port. The RH setting of the Pre-Humidiﬁer can be manually entered into the HSEMS AutoScheduler

software. Adding the Pre-Humidiﬁer to the HTDMA allows particle efﬂorescence studies to be conducted by

exposing the dry SEMS-selected particles to a high RH in the Pre-Humidiﬁer and then exposing the sample

ﬂow to a lower RH in the HSEMS.

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Pre-Humidiﬁer 3110

6 Pre-Humidiﬁer Speciﬁcations

Relative Humidity

Description MIN MAX UNIT

Sample Flow 0.1 2.0 lpm

RH 20 90 %

Response Time 1 10 minutes

Power

Description MIN MAX UNIT

Voltage Input 100 240 VAC

Power Input 10 Watts

Physical Dimensions

Description MIN UNIT

Width 19 in

Depth 12 in

Height 7 in

Weight 19 lb

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Pre-Humidiﬁer 3110

7 Appendix

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