ESPEC BTX-475 - Specimen Protection Safety Devices

Precautions in Usage
8
Bench Top User’s Manual
2.2 Keep Out of the Chamber
RISK OF BEING TRAPPED! NEVER climb inside the chamber. The
door cannot be opened from the inside.
2.3 Specimen Protection (Safety Devices)
Set safety devices according to test conditions and the type of
specimens. Unless properly set, specimens could be damaged if
something goes wrong during testing.
The chamber is controlled to a target constant temperature and humidity* by the controller. Nonetheless,
temperature and humidity can get out of control for various reasons. In such cases, to protect specimens
against thermal damage, the chamber has an independent overheat protector and overcool (optional)
protector.
* Humidity is not set with temperature only chambers.
2.3.1 Safety Device Setting Example
High Limit Temperature
In the following example, the target temperature is 40°C and the maximum allowed temperature of the
specimens is 60°C. Safety devices are set as follows:
TABLE 2.1. HARDWARE/SOFTWARE SAFETY DEVICES
Safety Device Trip Point
Equipment
Response when
Tripped
Overheat Protector
- Set approximately 20°C
higher than target tempera-
ture.
- Set below specimen’s max-
imum allowed temperature.
- Alarm displayed
- Heater shut OFF
- Humidifier shut OFF
(Temperature only
chambers excluded)
- Refrigerator shut OFF
- Air circulator shut OFF
- Specimen power sup-
ply control terminal
interrupted
TABLE 2.2. SETTING EXAMPLE FOR OVERHEAT PROTECTOR AND HIGH LIMIT TEMPERATURE ALARMS
Overheat Protector +60°C
- Set 20°C higher than target temperature
- Set to specimen’s maximum allowed temper-
ature
!
DANGER
!
CAUTI ON