Chapter Two: Installation
Environmental Requirements
23
Environmental Requirements
Follow the guidelines listed below when installing and using the 1179 flow controller.
1. Maintain the normal operating temperature between 0° and 50° C (32° and 122° F).
2. Observe the pressure limits:
A. Maximum gas inlet pressure is 150 psig.
B. Operational differential pressure is:
10 to 40 psid for
≤
5000 sccm units
15 to 40 psid for 10,000 to 30,000 sccm units
The standard orifice is sized for control over this range with the outlet at atmospheric
pressure.
3. Provide power input at ±15 VDC (±5%) @ 200 mA.
A. Maximum voltage/current at startup is ±15 VDC (±5%) @ 200 mA.
B. Typical steady state voltage/current should be ±15 VDC (±5%) @ 100 mA.
4. Allow 2 minutes for warm-up time.
5. Use high purity gas and filters in line upstream of the MFC.
6. Leave the power to the instrument on at all times, for optimal performance.
For additional information refer to Appendix A: Product Specifications, page 57.
