<7. General Specifications>
7-67
IM 01C25W01-01EN
Table 7e. Diaphragm material and Sealing face material
Wetted parts material
*
1
[Diaphragm material]
[Sealing face material]*
11
SS ........................
[S] 316L SST
[S] 316L SST
HS .......................
[H] Hastelloy C-276*
3
#
[S] 316L SST
*1:
Users must consider the characteristics of selected wetted parts material and the influence of process fluids. The use of
inappropriate materials can result in the leakage of corrosive process fluids and cause injury to personnel and/or damage
to plant facilities. It is also possible that the diaphragm itself can be damaged and that material from the broken diaphragm
and the fill fluid can contaminate the user’s process fluids.
Be very careful with highly corrosive process fluids such as hydrochloric acid, sulfuric acid, hydrogen sulfide, sodium
hypochlorite, and high temperature steam (150°C [302°F] or above). Contact Yokogawa for detailed information of the
wetted parts material.
*2:
Refer to section 12 for limitation of capillary length.
*3:
Hastelloy C-276 or N10276.
*4:
Electro polishing for all wetted parts (Diaphragm and Block).
*5:
Buffing for Block of wetted part except diaphragm. (JIS-standard: #400)
*6:
Clamp and gasket are not required, all of the code are selected “N”.
The ‘#’marks indicate the construction materials conform to NACE material recommendations per MR0175 (2003).
Please refer to latest standards for details.
Table 7f. Process temperature and Ambient temperature
Code
Process
temperature
*
7
Ambient
temperature
*
8
Working pressure
Specific
gravity
*
9
Silicone oil
(general use)
B
−10 to 120°C
(14 to 248°F)
−10 to 60°C
(14 to 140°F)
2.7 kPa abs (0.38 psi abs) to 1MPaG
0.94
Propylene glycol
P
−10 to 120°C
(14 to 248°F)
−10 to 60°C
(14 to 140°F)
100 kPa abs (atmospheric pressure)
to 1MPaG
1.04
*7:
See figure 1i ‘Working Pressure and Process Temperature.’
*8:
This ambient temperature is the transmitter ambient temperature.
*9:
Approximate values at a temperature of 25°C (77°F)
*10: Applicable for process connection size code “3” with capillary length more than 6 m.
*11: Pipe material (non-wetted parts): 316 SST
