Plant Growth Chamber – PG068

The PG Series is Darwin’s stock plant growth chamber design. It is quiet, easy to clean, highly reliable and ideal for plant growth use, It offers hot gas bypass control of refrigeration and resistive heat to facilitate reliable, temperature and humidity control. The PG068 is a wide double door plant growth chamber. This chamber gives researchers additional growing room for their plants. Popular options include humidification via humidistat or microprocessor based PID. and a viewing window. electronic/audit capable locks. Download Specification

SKU# PG068

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PG Series

The PG series chambers feature hot gas by-pass technology which controls the temperature of the epoxy coated evaporator for greater uniformity. Compressors in our PG series of environmental chambers come with a three year warranty - which is the longest in the industry.

Superior Control and Humidity

The ultrasonic humidification system provides excellent humidity control and avoids hot spots seen during chamber mapping of steam boiler equipped chambers. Standard control at the sensor in these chambers is ±0.2°C and ±0.3%RH.

Widely Proven, Non-Proprietary Controllers

Standard controllers for the PG Series are manufactured by Fuji Electric and are ideal for chambers. Unlike many proprietary controllers, this controller is commercially available and proven in tens of thousands of installations. Standard functions include: autotuning, fuzzy logic, PID control, programmable alarms, calibration capability, offset capability, etc. A touchscreen control interface is optional. Other controller manufacturers are also supported (Watlow, Allen Bradley etc.)

Greatly Reduced Direct and Indirect Energy Loads

The PG Series chambers utilizes less energy than comparable chambers and introduce less impact upon building cooling systems. This efficiency “dual benefit” allows our chambers to be located in spaces unsuitable for other chambers. Electrical energy savings by the PG series vs. steam boiler equipped chambers can easily amount to hundreds or thousands of dollars saved per year.

Services and Warranties

We offer free 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 preventive maintenance services at an additional cost. Please ask for a quote.

Quiet Operation

The PG chambers utilize quiet and highly efficient DC fans. Locating these chambers in laboratory workspaces is a viable option.

Widely Used Options for Plant Growth Chambers

  • LED lighting
  • T5HO bulbs
  • T8HO bulbs
  • Touchscreen controller (controls 3 outputs)

Additional information

Design and Purpose

The PG068-1,-2,-3 is a 1,2 or 3 tier plant growth chamber. The construction materials are well insulated with optimal coatings, come standard with remote interface (programming, data retrieval etc.), and utilize a drop-in refrigeration system for ease of repair. This unit is designed to outlast, outperform, and be easier to maintain.


The lighting that is included in the PG068-1,-2,-3 is standard with programmed dimming capabilities to achieve 500-1000 μmol/m2/s (6”) of broad PAR 5000K making this useful for entomology, arabidopsis, tissue culture, C3, C4, cannabis, algae, and general corn, wheat or soybean plant studies. Dimming is “all at once” type. Fixtures are easy to clean, white powder-coated aluminum with robust sealed LEDs. Fixtures are attached to (removable) shelves above and can be manually height adjusted in ½” increments as study needs change.

Cabinet Construction

Interior of 20-gauge, 304 stainless steel that is powder-coated white. This is a differentiator vs competitor thinner (26-gauge), galvanized, wet painted interior
Exterior of 20-gauge, galvanized steel for more resistance to dents vs 24-gauge
Door exterior of 20-gauge aluminum for long life. Magnetic gasket. Industrial hinges
Includes 2&3/4” casters (rated at 300lb/ea.) or leveling legs
2" I.D access port with access port cover and insulation plug located on side wall of the chamber.


Open wire 304 stainless steel capable of supporting 150lbs/shelf evenly supported


2” non-CFC urethane and poly-iso for superior thermal performance

Options Available

Controls – Touchpad, UPS
Humidification and/or Dehumidification w/programmability
Cabinet – Window (w/light tight cover), Stainless Exterior, Custom Sizes
Condensate Recirculation, Pan, or Pump
Lighting – Broad Spectrum, Custom, Dimmable with Closed Loop Control, T5, T8
Cooling – Water Cooled Compressors
CO2 Monitoring or Control

Cooling System

Industrial grade, top-mount, air cooled hot-gas bypass system is used for extended life and tight temperature control. System is designed to be drop-in for easier repair/replacement. Industry-leading 3-year warranty for cooling components. PG068’s come standard with polymer coated evaporator coils.


Airflow is through back wall plenum down to bottom of chamber for minimal plant disturbance and maximum uniformity.

Virtual Touchscreen/Controls

Users can view actual value and set point from front of the chamber as the actual PID controllers are placed in this location. The controllers can still be interfaced with or locked out, and only controlled via the virtual touchscreen. The virtual touchscreen is a CE and UL listed feature that can be accessed through the free viewer app (Easy Access) provided from a mobile device or desktop. Normal customer set-ups monitor or program multiple chambers through a phone or PC. Included advantages:

Data logging with the ability to verify the integrity of the data via the EASY Convertor tool
USB storage up to 32GB can be used for data log files and accessed via web browser or FTP. These files can be emailed daily and weekly
Built in 4GB flash memory and RTC (Real Time Clock)
Allows for users to be logged in while having different levels of access, also includes an automatic log off function
Alarm notification: Preprogrammed email or text (phone carrier name required) will be setup that contains brief trouble shooting help notes and phone number plus link to Darwin Chambers technical support team. Chamber(s) can be named by user to identify which chamber is in alarm. Preprogrammed text and email alarm events able to be categorized to different levels. Email and/or text will also be sent to notify user when chamber goes back into spec and is out of alarm.
SD card slot for expansion of storage and one USB hot port and 2 gigabit ethernet ports
Programmable temperature and dimming of lights