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MIL-STD-810H Method 507.6 Humidity Chamber - X Series Size 20

MIL-STD-810H Method 507.6 Humidity Chamber – X Series Size 20

The Auto Technology X Series Size 20 is a computer-controlled humidity chamber configurable for selected MIL-STD-810H Method 507.6 Procedure I profiles. Advanced Climate Control programs the coupled temperature and RH changes used by natural B1, B2, and B3 and induced B1.

  • Internal Volume: Approximately 20 ft³ (594 L)
  • Supported Profiles: Natural B1, B2, and B3; induced B1
  • Climate Control: Programmable temperature and relative-humidity profiles
  • Control System: PC-based sequencing, monitoring, graphing, and data logging

This configuration does not claim the extreme induced B2 or B3 profiles or Procedure II without separate engineering verification.

SKU: XSERIES20-MIL-STD-810-5076 Categories: ,

Description

MIL-STD-810H Method 507.6 Humidity Chamber

The Auto Technology X Series Size 20 can be configured for selected temperature-humidity profiles from MIL-STD-810H Method 507.6 Procedure I. The PC control system and Advanced Climate Control package coordinate temperature and RH through the hourly conditions defined by the selected cycle.

This configuration covers natural B1, B2, and B3 profiles and induced B1. The required cycle must be selected from the test item’s anticipated storage, transit, and operational environment.

Cycle-specific capability: Method 507.6 does not define one universal humidity exposure. The test plan must identify the procedure, B1/B2/B3 category, natural or induced profile, duration, test-item configuration, and operational-check requirements.

X Series Size 20 Specifications

Internal volume 20 ft³ / 594 L
Internal dimensions 50 × 29 × 25 in / 127 × 73 × 64 cm
Base external dimensions 95 × 43 in / 242 × 110 cm
Climate system Advanced Climate Control
Controls PC-based programmable controls

X Series Size 20 MIL-STD-810H humidity chamber dimensional drawing
Size 20 dimensional information. Final installation must account for controls, ventilation, utilities, and service access.

Supported Procedure I Profiles

Profile Daily conditions Exposure represented
Induced B1 Nearly constant 27 °C with RH varying from 95% to nominally 100% Constant high humidity during storage or transit
Natural B1 Nearly constant 24 °C with RH varying from 95% to nominally 100% Continuously damp tropical operating conditions
Natural B2 Approximately 26-35 °C and 74-100% RH through the daily profile Cyclic tropical humidity with daytime warming and partial drying
Natural B3 Approximately 31-41 °C and 59-88% RH through the daily profile Hot-humid coastal operating conditions

Nominal 100% RH means as close to saturation as possible, but not below 95% RH for chamber-control purposes. The general Method 507.6 tolerance is ±5 percentage points RH at the control sensor.

Procedure I Test Sequence

  1. Condition the test item for at least 24 hours at 23 ±2 °C and 50 ±5% RH.
  2. Run the selected induced storage/transit profile for the duration required by the test plan.
  3. Return to 23 ±2 °C and 50 ±5% RH until the test item stabilizes.
  4. Inspect, operationally check, and reconfigure the test item for its operating environment.
  5. Run the corresponding natural profile for the required number of 24-hour cycles.
  6. Return to standard ambient conditions for final stabilization, inspection, and operational checkout.

B1 selection note: A test plan may require only the induced storage/transit exposure or only a natural exposure. The applicable requirements document determines the required sequence.

Standard Test Durations

Profile Non-hazardous items Hazardous items
Induced B1 90 days 180 days
Natural B1 45 days 90 days
Natural B2 45 days 90 days
Natural B3 15 days 30 days

Computer-Controlled Temperature and RH Profiles

X Series PC controls for MIL-STD-810H Method 507.6 humidity profiles
X Series PC controls sequence the hourly temperature and RH points and provide live monitoring, graphing, and chamber data logging.
X Series air-management hardware for MIL-STD-810H temperature and humidity transitions
X Series air-management hardware supports the programmed heating, cooling, humidification, and drying changes used by the selected profile.

Method 507.6 Chamber and Measurement Requirements

  • Prevent chamber condensate from dripping onto the test item.
  • Vent the test volume to prevent total-pressure buildup.
  • Drain and discard condensate rather than reusing it.
  • Use RH sensors whose calibration is not affected by condensation, or another accepted measurement method.
  • Maintain air velocity around the test item between 0.5 and 1.7 m/s.
  • Record temperature and RH continuously or at digital intervals of 15 minutes or less.
  • Use an independent calibrated recording system separate from the chamber controller.

Water used for humidity generation should have a pH of 6.5-7.2 at 25 °C. MIL-STD-810H recommends water resistivity between 0.15 and 5 MΩ·cm and requires water quality to be documented when it falls outside that range.

Scope of this configuration: Induced B2 reaches 63 °C/19% RH, and induced B3 reaches 71 °C/14% RH. Those profiles and the Procedure II aggravated cycle require separate engineering verification and are not included in this Size 20 capability claim.

Specify the MIL-STD-810 revision, Procedure I cycle, natural or induced profile, item configuration, test duration, operational checks, loading quantity, and required independent instrumentation when requesting a Method 507.6 Size 20 configuration.

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