EWS chambers are solid, one-piece construction, using fiberglass insulation and an angle-iron frame. The stainless steel interior liner is reinforced and continuously welded, including leak-testing for integrity.

  • Temperature range up to 150°C
  • Temperature-cycling faster than 10°C/min.
  • Capabable of long-term 85°/85% tests

(Conventional chambers, like our EWP models, are built using panels with foam insulation that cannot withstand higher temperatures and are more susceptible to leaks at the seams under extreme conditions, such as fast temperature cycling.)

The angle-iron frame provides enough structural strength to allow a full-opening door for easy loading of large arrays without restriction. A full-opening door can also allow floor-space saving over panel chambers.


Note: Actual change rate capability is determined by selection of heating/cooling system based on your requirement.

Easy-to-use Programmer

In addition, the P-300 touch-screen controller makes running an ESPEC environmental test chamber a breeze. The full-color, touch-screen interface is remarkably easy to use and understand. The P-300 Touch Screen Controller can be managed remotely via our Ethernet/LAN-based Web Controller, serial port, or GP-IB/LabView.

Features for Solid Walk-in Chambers
  • Solid-construction chamber is a one-piece welded structure with six inches of fiberglass insulation and a 304 stainless steel interior
  • Full-opening door(s) with heated windows
  • One 4" (100mm) diameter cable port with silicone plug

Refrigeration and Plenum

  • Modular or Integrated Air Plenum with cooling coil, wire heaters, and two circulator blowers
  • Non-CFC refrigeration system using Copeland Discus or Scroll compressors
  • Automatic water regulator controls water usage on water cooled models
  • Humidity system includes steam generator and dehumidification coil

System Controls

  • Instrumentation console mounted to the right of the chamber door
  • Three levels of overheat protection including an independent, adjustable sensor
  • ESPEC's Exclusive P-300 Programmer

Optional Capabilities

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Photo of Solid Walk-in
One-piece chamber construction for durability

Product Suggestions
Model Number Interior Dimensions
(W x D x H)
Interior Volume Temperature Range Humidity Control Change Rate
EWS183 48" x 70" x 94" 183 cu. ft. (-35 or -65) to 150°C Optional up to 1-15°C/min. Representative model: size and performance customized to your needs
EWS364 62" x 108" x 94" 364 cu. ft. (-35 or -65) to 150°C Optional up to 1-15°C/min. Representative model: size and performance customized to your needs
EWS499 85" x 108" x 94" 499 cu. ft. (-35 or -65) to 150°C Optional up to 1-15°C/min. Representative model: size and performance customized to your needs

      Click model number for details, including metric & english units.

Get improved performance, energy savings, plus USB access

New P-300 controller with USB

The exclusive ESPEC P-300 controller has USB and Ethernet features to make programming and data collection easier than before. The user interface uses tabs for faster access to any screen. Standard USB and optional Web Controller/Ethernet interfaces make programming and data acquisition much simpler. In addition, improved algorithms make operation faster and smoother.

DEMO: See how easy the P-300 is

USB port for upload/download of test profiles and test data

  • Test programs can uploaded or downloaded from the P-300 via USB thumb drive.
  • Create, edit, and store programs on a PC using the included Pattern Manager Lite software.
  • Accurate, repeatable testing by uploading the same program to multiple chambers.
  • Create your own back-up archive of programs, and get additional profiles from ESPEC's library.
  • Retrieve and download test operation data via USB thumb drive. Data timeframe is selectable.
  • For integrity, viewing test data on a PC and exporting to Excel requires included Pattern Manager Lite software.

Energy-saving operation

Invisible to the end user, the P-300 uses advanced cooling control via an electronic expansion valve, saving energy and improving temperature stability. Sophisticated future-looking algorithms make temperature ramping faster and smoother. These high-end features are unique to ESPEC. Additional improvements in refrigeration and heater operation will make the next generation of ESPEC chambers the most energy efficient ever.

Additional capabilities

  • Store up to forty programs, as well as three different constant-mode set-ups.
  • Multilingual display in English, Japanese, Chinese, or Korean.
  • Alarm diagnostics and history, plus a ‘back trace’ feature for troubleshooting.
  • Three programmable timers allow the user to set reminders for maintenance or other actions.
  • Energy saving by using only one compressor when testing above -10°C (for cascade refrigeration models).
  • Optional Ethernet/browser-based Web Controller access can also be used to upload and download programs, as well as data.
  • Optional Product Temperature Control allows faster ramping to the desired conditions on the sample.
  • Computer interface options for specialized programs: RS-232/serial or GP-IB.

P-300 Specification

Specification Features

Color touch-screen, 6.5 inch diagonal, 640x480 resolution
Multilingual display in English, Japanese, Chinese, or Korean

Control Method

PID (Proportional, Integral, Derivative)
plus WRTC (Window Reference Trajectory Control)


Standard: USB External Memory port
Optional: RS-232, RS-485, GP-IB, Ethernet

Operating Modes
(as indicated in upper left of the display)

STOP: chamber off, programmer on
PGM: RUN runs selected test profile
CONSTANT: runs at set value continually

Program Capacity

40 programs, 99 steps per program

Programming Capabilities

Create or copy programs
Upload and download of programs via USB
Copy, edit, insert, and delete steps
Two nested loops to repeat steps 999 times
Selectable end-of-test modes
Create pause steps within programs
Soak control delays timer until setpoint is reached

Additional Functions

Alarm report lists last 1000 alarms and time occurred
Time signal relay control (with naming capability)
High/low limit alarm functions
Audible alarm with on-screen explanation
Selectable restart modes after power failure
Automatic start and stop functions
Keylock protection and configuration lock-out
Service guide and help screens
Three settable reminder alarms for PM
Running time meter is integral
RoHS directive lead-free compliant

Pattern Manager Lite Software

Allows creation, editing, and archive storage of test profiles on a PC
Test profiles may be uploaded and downloaded to P-300
Allows viewing and graphing of chamber operation data downloaded via USB
Operation data may be exported to CSV for use with Excel or other programs

Software Options

Learn more about ways to access ESPEC controllers via software our support page:
Software for P-300

Recommended: Web Controller

The ESPEC Web Controller is an embedded server/software solution for monitoring and programming your chamber via Ethernet. Works with P-300, SCP-220, F4T, & F4 controllers.

See the brochure
Self-install kit for existing units
Try the live demo now!

Independent of the controller itself, the Web Controller adds additional capabilities for datalogging, programming, alarm emails, and RESTful API.

Get quick pricing on Solid Walk-in Chambers

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