Thermo Scientific 3050 User manual

Visit us online to register your warranty
www.thermoscientific.com/labwarranty
User Manual
Model 3050/3052
Gas Guard
Operating and Maintenance Manual 7013050 Rev. 5

Thermo Scientific
MANUAL NUMBER 7013050
5 31031/31321/IN-4552 12/4/15 Updated specifications, parts list, schematics ccs
4 23451/IN-3294 6/30/06 Added ±5 psig to incoming CO2 pressure range ccs
3 -- 9/29/03 Clarified description (power failure on Gas Guard) ccs
- 20325/IN-2981 9/6/01 Release 3 updated declaration of conformity aks
2 20302 8/16/01 Electrical mains connection and service revisions aks
1 19988/IN-2929 4/23/01 Elec. Schematics and specifications updated aks
- IN-2200 12/12/96 Additional updates for 1010 heg
- SI-5967 12/12/96 Added RJ-11 wiring color codes heg
- 15794 12/12/96 Added Alarm system warning heg
0 12/3/96 Updated for 1010 and FLA Ratings deg
REV ECR/ECN DATE DESCRIPTION By
Preface
Model 3050/3052 i
Caution Model 3050/3052 Gas Guard is designed to be used with CO2and N2only. s

Thermo Scientificii Model 3050/3052
Preface
Contains Parts and Assemblies
Susceptible to Damage by
Electrostatic Discharge (ESD)
CAUTION
Important Read this instruction manual. Failure to read, understand and follow the instructions in this manual
may result in damage to the unit, injury to operating personnel, and poor equipment performance. s
Caution All internal adjustments and maintenance must be performed by qualified service personnel. s
Material in this manual is for information purposes only. The contents and the product it describes are subject
to change without notice. Thermo Fisher Scientific makes no representations or warranties with respect to this
manual. In no event shall Thermo be held liable for any damages, direct or incidental, arising out of or related to
the use of this manual.
©1996 Thermo Fisher Scientific. All rights reserved.

Thermo Scientific Model 3050/3052 iii
Preface
Important operating and/or maintenance instructions. Read the accompanying text carefully.
Potential electrical hazards. Only qualified persons should perform procedures associated with this
symbol.
Equipment being maintained or serviced must be turned off and locked off to prevent possible injury.
Marking of electrical and electronic equipment, which applies to electrical and electronic equipment
falling under the Directive 2002/96/EC (WEEE) and the equipment that has been put on the market
after 13 August 2005.
This product is required to comply with the European Union’s Waste Electrical & Electronic
Equipment (WEEE) Directive 2002/96/EC. It is marked with the WEEE symbol. Thermo Fisher
Scientific has contracted with one or more recycling/disposal companies in each EU Member State
European Country, and this product should be disposed of or recycled through them. Further
information on Thermo’s compliance with this directive, the recyclers in your country and
information on Thermo Scientific products will be available at www.thermofisher.com.
4Always use the proper protective equipment (clothing, gloves, goggles, etc.)
4Always dissipate extreme cold or heat and wear protective clothing.
4Always follow good hygiene practices.
4Each individual is responsible for his or her own safety.

Thermo Scientificiv Model 3050/3052
Preface
Do You Need Information or Assistance on
Thermo Scientific Products?
If you do, please contact us 8:00 a.m. to 6:00 p.m. (Eastern Time) at:
1-740-373-4763 Direct
1-800-438-4851 Toll Free, U.S. and Canada
1-877-213-8051 FAX
http://www.thermoscientific.com Internet Worldwide Web Home Page
[e-mail] Tech Support Email Address
Certified Service Web Pagewww.unitylabservices.com
Our staff can provide information on pricing and give you quotations. We canSales Support
take your order and provide delivery information on major equipment items or make
arrangements to have your local sales representative contact you. Our products are listed on the
Internet and we can be contacted through our Internet home page.
Our staff can supply technical information about proper setup, operation orService Support
troubleshooting of your equipment. We can fill your needs for spare or replacement parts or
provide you with on-site service. We can also provide you with a quotation on our Extended
Warranty for your Thermo Scientific products.
Whatever Thermo Scientific products you need or use, we will be happy to discuss your
applications. If you are experiencing technical problems, working together, we will help you
locate the problem and, chances are, correct it yourself...over the telephone without a service
call.
When more extensive service is necessary, we will assist you with direct factory trained
technicians or a qualified service organization for on-the-spot repair. If your service need is
covered by the warranty, we will arrange for the unit to be repaired at our expense and to your
satisfaction.
Regardless of your needs, our professional telephone technicians are available to assist you
Monday through Friday from 8:00 a.m. to 6:00 p.m. Eastern Time. Please contact us by
telephone or fax. If you wish to write, our mailing address is:
Thermo Fisher Scientific (Asheville) LLC
401 Millcreek Road, Box 649
Marietta, OH 45750
International customers, please contact your local Thermo Scientific distributor.

Model 3050/3052 vThermo Scientific
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Installation and Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Connect the Gas Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Connect the Gas Tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
Connect Gas Guard to Power Source . . . . . . . . . . . . . . . . . . . . . . . .2-2
Control & Indicating Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Maintenance and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Electrical Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Section 8
Section 7
Section 9

Model 3050/3052 1-1Thermo Scientific
Location
Section 1 Introduction
Model 3050/3052 Gas Guard is a monitoring and switching device for
CO2and N2gas supplies. The unit will monitor a two cylinder gas
supply. When the active supply tank is depleted, an audible alarm sounds
and the gas guard automatically switches to the second tank. The audible
alarm is silenced by manually switching the SILENCE switch to the other
tank position.
Power failure stops the automatic tank switching operation of the Gas
Guard. Gas will continue to flow from Tank #1 in a power failure, if the
tank is not empty. An Uninterrupted Power Source is recommended to
ensure continuous gas flow, no matter which tank is in service at the time
of power failure.
Located on the back of the unit, a voltage selector switch permits the
appropriate voltage selection (115V/230V). The unit is also equipped with
a single remote alarm contact that monitors alarm conditions such as an
empty supply tank, or a power failure to the unit.
Caution Model 3050/3052 Gas Guard is designed to be used with CO2
and N2only. s
Locate Model 3050/3052 on a level surface. Provide adequate space near
the incubator for storage of the CO2or N2cylinders.
Warning O.S.H.A. Regulations have been established for the handling,
storage, and use of high pressure gas storage cylinders. Consult the latest
edition of the O.S.H.A. Regulations to ensure compliance with all safety
requirements. Also, consult all applicable state and local regulations. s

Model 3050/3052 2-1Thermo Scientific
Section 2 Installation and Start-Up
Connect a regulated gas supply to each of the two inlet fittings located on
the back of the unit. The fittings are labeled. Refer to Figure 2-1. A filter
(Stock No. 770001) is recommended to be installed on each of the inlet
connections. Check the connections for leaks.
The gas outlet is located between the inlet fittings. Refer to Figure 2-1.
Connect the supply tubing to the barbed outlet and connect the other end
to the incubator or other piece of equipment requiring a gas supply. Check
the gas outlet for a possible leak.
TANK 1
15 PSI
REGULATED
ALARM
CONTACTS
30V, 1A MAX.
TANK 2
15 PSI
REGULATED
OUTLET
VOLTAGE
SELECT
115V
Figure 2-1. Rear View
Connect the Gas
Tanks
Connect the Gas
Outlet

2-2 Model 3050/3052 Thermo Scientific
Section 2
Installation and Start-Up
Connect Gas Guard to
Power Source
Set the voltage select switch to the proper setting (115V or 230V). For
Model 3050 set the voltage select switch to 115V and use part number
430108 line cord. For Model 3052 set the voltage select switch to 230V
and use part number 430109 line cord. Should the application require an
alternate cordset, consult the factory. See Figure 2-2.
With the power switch OFF, plug the cord set into the receptacle on the
back of the unit. The cord set is the mains disconnect for the gas guard.
Connect the other end of the cord set to an adequate power source. Refer
to the serial tag located on the back of the unit or see the Specifications
section or electrical schematics in the back of this manual for specific
power requirements.
Note It is recommended that the gas guard be connected to a separate
electrical circuit. s
Warning Use only a grounded electrical receptacle. Failure to ground the
unit can result in serious injury from electrical shock. s
1. Turn the CONTROL switch On.
2. Select the active tank using the SILENCE switch.
Start-Up Procedure
IMPORTANT USER INFORMATION
STOCK #296032
BEFORE INSTALLING POWER
CORD, ENSURE VOLTAGE
SELECTOR SWITCH IS IN
CORRECT POSITION TO MATCH
APPLIED VOLTAGE.
Figure 2-2. Voltage Switch and Receptacle Location

Model 3050/3052 3-1Thermo Scientific
Section 3 Control & Indicating Devices
Control Switch
The Control switch controls power to the Gas Guard control circuit
board. The yellow LEDs on the front panel designate which tank is
active and indicate the unit is receiving power.
Silence Switch
The Silence switch silences the alarm and selects the alternate tank. If the
Silence switch fails to silence the alarm, it is an indication that both gas
tanks are depleted or incapable of producing 15 PSIG.
Warning During initial start-up, the incubator connected to the Model
3050/3052 Gas Guard should not be injecting gas. s
Gas Depletion Alarm
The gas depletion alarm sounds automatically when the active supply
tank becomes empty. The other tank becomes active with the sounding
of the alarm.
Note Should both supply tanks become depleted, the only way to silence
the alarm is to turn the CONTROL switch to Off. s
Active Tank Indicating Lights
The two yellow indicating lights, labeled TANK1 On and TANK2 On,
located on the front of the control panel, show which gas tank is active.
Pressure Low
On
Pressure Low
On
Off Control
On
Gas Guard
T
A
N
K
1
T
A
N
K
2
Silence
Figure 3-1. Front View

Pressure Low Indicating Lights
The two red indicating lights, labeled Pressure Low, show when a supply
tank is depleted. If both tanks are depleted, both red indicating lights
will be lighted.
Voltage Select Switch (refer to Figure 2-1)
The VOLTAGE SELECT switch, on the back of the unit, permits the
selection of the proper electrical line voltage (115V or 230V).
Caution Make sure to set the switch to the correct voltage before
connecting the unit to power. s
Remote Alarm Contact (refer to Figure 2-1)
A SPDT relay is provided for monitoring alarm conditions on the Gas
Guard. Connections are made by means of an RJ-11, telephone style
jack, located on the back of the unit. Figures 3-2 and 3-3 show the con-
nector wiring diagram. A power outage or low gas pressure on the Gas
Guard will activate the relay.
A modular to modular cable, part no. 190388 and an RJ-11 telephone
style terminal converter, part no. 190392 or equivalent may be used to
convert to a screw terminal connection. Refer to the above illustration.
3-2 Model 3050/3052 Thermo Scientific
Section 3
Control and Indicating Devices
(2) COM
(4) N.C.
(3) N.O.
ALARM CONTACTS
30V MAX / 1 A MAX
Common (YEL) 5
N.O. (GRN) 4
N.C. ( RED) 3
not used (BLK) 2
(BLK) 2
(RED) 3
(GRN) 4
(YEL) 5
2 (YEL)
3 (GRN)
4 (RED)
5 (BLK)
Stock # 190388
Modular to Modular Cable, 12 ft.
Standard Telephone 4-Cond. Line Cord
(Note Crossed Pinning)
Stock # 190392
RJ-11 to Screw
Terminal Converter
Figure 3-2. Connections
Figure 3-3. Wiring

Model 3050/3052 4-1Thermo Scientific
Section 4 Maintenance and Service
Routinely check all the following every six months to ensure their proper
operation.
1. Check all piping connections between the CO2/N2source, the gas
guard and the incubator
2. Check the Mains Disconnect and the power indicator to make sure
that the unit is on.
3. Change gas inlet filters yearly, or as needed (if applicable).
Caution Before using any cleaning or decontamination method except
those recommended by the manufacturer, users must check with the
manufacturer that the proposed method will not damage the equipment. s
Warning Turn the unit off and disconnect power cord before cleaning. s
Clean the exterior with a damp sponge or soft, well-wrung cloth and mild
detergent dissolved in water. Dry with a soft cloth.
Warning High voltage is present behind control panel. Servicing must be
performed by qualified electrical service personnel only. s
Cleaning
Service
Contains Parts and Assemblies
Susceptible to Damage by
Electrostatic Discharge (ESD)
CAUTION

Model 3050/3052 5-1Thermo Scientific
Section 5 Specifications
Exterior Dimensions . .7.13”W x 5.13”H x 9.25 F-B
. . . . . . . . . . . . . .(18.1 cm x 13.1 cm x 23.5 cm)
Gas Connections . . . . . .Inlet - two ¼” barb fittings;
. . . . . . . . . . . . . . . . .Outlet - one ¼” barb fitting
Inlet Pressure . . . . . . . . . . . . . . . .15 PSIG, ±5 PSIG
Construction . . . 18 Ga. CRS, Heavy-gauge metal w/powder coated finish
Electrical . . . . . . . . . . . . .Switchable from 115/230V
100-115V, 1PH, 50/60 Hz, 0.3 FLA
200-230V, 1PH, 50/60 Hz, 0.15 FLA
Not to exceed ±10% of nominal
Power Connection . . . . . . . . . .IEC 320 Female Plug
Remote Alarm Contact . . RJ-11 Phone Jack (C, NO, NC)
Contact Rating . . . . . . . . . . . . . . . . . .30V, 1A Max
Shipping Weight . . . . . . . . . . . . . . . .13 lbs. (5.9 kg)
The Model 3050/3052 Gas Guard is designed to be electrically safe in the
following environmental conditions:
Indoor use only
Altitude: Up to 2,000 meters
Temperature: 5°C to 40°C
Humidity: 80% RH at or below 31°C, decreasing linearly to 50% RH
at 40°C
Mains Supply Fluctuations: ±10% of nominal voltage
Installation Category II1
Pollution Degree 22
Class of Equipment
1 Installation category (overvoltage category) defines the level of transient overvoltage which the instrument
is designed to withstand safely. It depends on the nature of the electricity supply and its overvoltage
protection means. For example, in CAT II which is the category used for instruments in installations supplied
from a supply comparable to public mains such as hospital and research laboratories and most industrial
laboratories, the expected transient overvoltage is 2500V for a 230V supply and 1500V for a 120V supply.
2 Pollution Degree describes the amount of conductive pollution present in the operating environment.
Pollution Degree 2 assumes that normally only non-conductive pollution such as dust occurs with the
exception of occasional conductivity caused by condensation.

Section 6 Parts List
Stock No. . . . . . . . . . . . . . . . . . . . . . . . .Description
190411 . . . . . . . . . . . .Wired WJ Gas Guard Control
230120 . . Fuse, BK/GMC-500mA, 250V Time Delay (T)
250108 . . . . . . . . . . .Solenoid Valve, Brass, 12VDC
360213 . . . . . . . . . .Pressure Switch, 12.5 Adjustable
360214 . . . . . . . . . . . .Voltage Select Switch, DPDT
420082 . . . . . . . . . . . . . . . . . . .Transformer, 80 VA
430108 . . . .Cordset, 10A, 125V (Model 3050 only)
430109 . . . .Cordset, 10A, 250V (Model 3052 only)
460123 . . . . . . . . . . . . . . . . . . .Power Inlet, Snap-In
190388 . . . . . . .Telephone cable, RJ-11 plugs, 12 ft.
190392 . . . .RJ-11 Jack to Screw Terminal Converter
770001 . . . . . . . . . . . . . . . . . .Disposable filter 99.97
Model 3050/3052 6-1Thermo Scientific

Model 3050/3052 7-1Thermo Scientific