Darwin Chambers

Cleanroom Chamber

CLO34 Cleanroom Chamber

CL Series Overview

The CL series chambers are used for a variety of research applications. These units are specifically made for a cleanroom environment. The CL series cleanroom chambers include heating and cooling capabilities. These units have lower temperature capabilities than our thermoelectrically cooled units, have associated greater heat removal capabilities, and are ideal for locations where the ambient conditions cannot be controlled very well. These units will also outperform our thermoelectric units where specifications call for fast “open door” recovery times.


The CL series chambers are used for a variety of research applications.

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The CL034 is a single-door chamber designed for maximum capacity while still allowing passage through most commercial doorways.

Cabinet Construction
  • Standard model features grade 304 stainless steel 18-gauge, #4 finish
  • 2″ I.D access port with access port cover and insulation plug located on side wall of the chamber.
  • Fully welded and sealed door with magnetic gaskets. Has a heavy-duty grade 304 stainless steel latch that ensures secure closure after door opening
  • Entire cabinet structure and doors insulated using minimum 2” non-cfc- polyurethane insulation.
  • Insulation manufacturer utilizes CFC free blowing agent that has zero ODP.
  • Unit completely pre-wired at factory, and ready for final connection to a 115/60/1 phase – 15 amp dedicated (recommended) outlet. Unit runs approx. 6RLA under test conditions.
  • A 9 ft cord with NEMA 5-15P plug is included.
  • A sole use circuit is recommended
  • Unit also equipped with 3 grade 304 stainless steel shelves
  • Shelves capable of supporting up to 100 lbs of evenly distributed weight.
  • Full height shelf support pilasters, with double oblong holes on ½” centers. Pilasters made of the same material as cabinet interior. Four (4) chrome plated, stainless steel shelf clips to be included for each shelf.
Refrigeration System
  • Unsurpassed temperature control through continuous refrigeration bypass system
  • Refrigeration system factory balanced using CFC free 134A refrigerant
  • Top mounted air-cooled condensing unit
  • Factory pre-engineered capillary tube system with over-sized condenser and evaporator to reduce product pull down time and to consistently maintain interior cabinet temperature (non-adjustable capillary tube system superior to problematic expansion valve).
  • Evaporator- epoxy-coated at the time of manufacture to eliminate the potential of corrosion.
Performance Standard Customized Option
Temperature Range 4º C to 37º C -5º C to 70º C
Ambient Temperature 21º C ± 3º C Low Temp. and High Temp. Ambient Available
Temperature Control ± 0.2º C Available
Temperature Uniformity ± 1º C Available
Control Resolution 0.1º C Available
Temperature Sensor NIST Traceable PT100 RTD Class A Available
Control System Standard Customized Option
Controller Fuji PXF4 (PID – Fuzzy Logic) West EC-44, Future Design Touchpad, Watlow, Allen Bradley
Control Readout Actual and Set-Point Values Trending, Duty Cycle
Calibration Corrrection Capability Standard 0.1 Resolution Available
Uniformity Off Set N/A N/A
Alarm Audible and Visual Text, Email, Web Server, Remote Access
Alarm Type Deviation in 0.1º C or 0.1% RH with Delay Absolute 0.1 Resolution with Delay
Remote Monitoring Dry Alarm Contact, RS 485 & Analog Output Ethernet
Password Protection Numeric Numeric, Alpha Numeric
Audit Trail N/A Available
Uninterrupted Power Supply (Monitoring) N/A Available
Construction Standard Customized Option
Exterior 18 gauge 304 Grade Stainless Steel, #4 finish 316 Grade Stainless Steel 18-guage, #4 finish
Interior 18 gauge 304 Grade Stainless Steel, #4 finish 316 Grade Stainless Steel -18 gauge, #4 finish
Shelving 3; 304 grade Stainless Steel Shelves, Supports Up to 100 lbs of Evenly Distributed Weight Custom sheet metal shelf per customer specification
Legs/ Casters 2.75”. Total Weight Capacity is 300 lbs per Caster (not Including the weight of the chamber). Chamber can be placed directly on floor without casters
Panel Insulation Minimum 2″ thick insulation; closed cell polyisocyanurate (polyiso) foam core and polyurethane insulation.
Doors 18 gauge 304 Grade Stainless Steel, #4 finish welded seams. Door is installed with 2 left hinges. Door is reversible- please specify swing direction. * refer to drawing for standard door location
Access Port 2″ I.D access port, cover and installed plug. Customizabe access port size and location available.
Capacity & Dimensions US Standard Metric
Interior Capacity 29.58 ft3 837.6 liters
External Dimensions 34”W x 35”D x 80.5”H 86.36cm W x 88.9cm D x 204cm H
Internal Dimensions 29.5” W x 29.75” D x 58.25” H 74.93cm W x 76.2cm D x 160.973cm H
Shelf Dimensions 28.75” W x 26” D 54.61 cm W x 66.68 cm D
Crated Weight 745 lbs 338 kg
Utilities US Standard International
Voltage (dedicated circuit required) 115 / 60 / 1 230 / 50 / 1
RLA 8 2.74m
Cord Length 9 ft long cord with NEMA 5-15P Plug 4 With Step Down Transformer
Drain Line Chambers are equipped with 1/2″ polytube. Floor drain or sink required adjacent to chamber Condensate pump option available, if floor drain is not available nearby


CL Series

The CL series chamber includes heating capabilities and cooling capabilities. These units are specifically made for a clean room environment. They have lower temperature specifications than our thermoelectrically cooled units and have associated greater heat removal capabilities. These units will also outperform our thermoelectric units where specifications call for fast “open door” recovery times.


Darwin Chambers CL034 model comes standard with a temperature range of 4° C to 37° C with temperature control of ± 0.2° C and superior temperature uniformity of ± 1° C. Quick recovery via forced air plenum/ refrigeration system.

Control System

All CL series models come standard with a Fuji PXF4 (PID – Fuzzy Logic) controller providing a readout of actual and set-point values. This chamber comes with audible and visual alarms, remote monitoring and a numeric password protection. Chamber has cleanable solid front face with control panel section guarded by clean plastic enclosure.


All CL series offer endless customized options. Common upgrades include more stainless steel shelving, various lighting options including LED, fluorescent, dimming options and microprocessor control of lights. More options include water cooled conditioning unit, door lock, full swinging interior glass door, heated glass door, chart recorder, and humidity control. Chamber controls can be turned around making it serviceable from non-clean room side. There is also the option to upgrade the controller.

Services and Warranties

Darwin Chambers Company offers 24-hour technical support throughout the lifetime of your chamber. In addition to standard warranties, we also offer extended warranties for cooling components, parts and labor. We also provide qualifications, validations and preventive maintenance services at an additional cost. Please ask for a quote.


Darwin Chambers CL034 model is constructed of grade 304 stainless steel 18-gauge, #4 finish, interior and exterior. All chambers come with a 2” access port. Fully welded and sealed door with magnetic gaskets, which ensure secure closure after door opening. Engineered frame structure for rigidity. Covered top for placement in clean room – refer to drawing for header spacing. Dual, swivel locking casters. Chamber has matching stainless steel sheet metal skirts to cover the casters and to seal the space between floor and chamber. Integrated drain system in plenum for quick condensate removal.