Dwyer 391/393/394系列侧安装式液位控制

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Dwyer 391/393/394系列侧安装式液位控制

重型和低成本是对391系列液面控制的完美描述。不锈钢开关机构使用重力返回作用,而不是弹簧的长寿命。耐候外壳是标准的。焊接钢室在600°F(315°C)下可满足650 psig(45 Bar)的焊接要求。



选型表

EXAMPLE391WT7810C170
391-WT-7810-C1-70 Liquid Level Control with welded carbon steel chamber, watertight – NEMA 4X enclosure, SPDT snap action switch rated 12 amp 120 VAC, 5 amp 240 VAC, fixed deadband and automatic reset, operating pressure 600 psig (41 bar) at 100ºF (38ºC), 500 psi (34 bar) at 600ºF (315ºC), side/bottom process connections 1” NPT, minimum specific gravity 0.70.
CONNECTION391




One Horizontal and One Vertical 1” NPT or Socket Weld
393




One Vertical and One Horizontal Flanged Connection
394




Two Vertical Flanged Connections
ENCLOSURE
G



General purpose, NEMA 1

WT



Weatherproof, NEMA 3R, 4, 4X

E



Explosion-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G

EV



Explosion-proof, vapor proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G
CIRCUITS
(for electrical circuits,
See charts A & B below)


48XX


Single stage, mercury switch, see chart A.


48XX


Two stage, mercury switch, see chart A.


78XX


Single stage, snap switch, see chart B.


78XX


Two stage, snap switch, see chart B.


78XXHM


Hermetically sealed snap switch, see chart B.


98XX


Single stage, high capacity DC snap switch, see chart B.


98XX


Two stage, high capacity DC snap switch, see chart B.


10XX


Single stage, high temperature snap switch, see chart B.


10XX


Two stage, high temperature snap switch, see chart B.
CHAMBER MATERIAL





Refer to chart C below for pressure/temperature ratings



C1

Carbon steel body
MINIMUM SPECIFIC
GRAVITY




70
0.70 specific gravity (391 only)




80
0.80 specific gravity (391 only)




95
0.95 specific gravity (391 only)




170
0.70 specific gravity & 150# flange (393, 394 only)




180
0.80 specific gravity & 150# flange (393, 394 only)




195
0.95 specific gravity & 150# flange (393, 394 only)




370
0.70 specific gravity & 300# flange (393, 394 only)




380
0.80 specific gravity & 300# flange (393, 394 only)




395
0.95 specific gravity & 300# flange (393, 394 only)




670
0.70 specific gravity & 600# flange (393, 394 only)




680
0.80 specific gravity & 600# flange (393, 394 only)




695
0.95 specific gravity & 600# flange (393, 394 only)
OPTIONS




H21” socket weld hub instead of 1” NPT





STWSS tag wired





01Breather only (E-Housing only)





02Drain only (E-Housing only)





12Breather and drain (E-Housing only)





23720Fungus proofing special 23720

CHARTS A & B - ELECTRICAL CIRCUITS AND RATINGS

SWITCH TYPE
SWITCH ACTION
ELECTRICAL RATINGS IN AMPS
ORDERING CODE

AC
DC
SINGLE STAGE
TWO STAGE
120V
240V
440V
30V
125V
250V
LOWER
UPPER
CHART A
Mercury Contacts
SP-ST open on level FALL
10
5
3†

10
5
-4821
-4821
-21
UL
SP-ST open on level RISE
10
5
3†

10
5
-4820
-4820
-20
UL
SP-DT one switch
4
2
1†

4
2
-4810
-4810
-10
UL
SP-DT two switches E.I.*
10
5
3†

10
5
-4815
-4815
-15
UL
DP-ST two switches E.I.* open on level FALL
10
5
3†

10
5
-4813
-4813
-13
UL
DP-ST two switches E.I.* open on level RISE
10
5
3†

10
5
-4814
-4814
-14
UL
DP-DT two SP-DT switches
4
2
1†

4
2
-4806
-4806
-06
UL
CHART B
snap action contacts
SP-DT one switch
12
5
3†

0.5**
0.25**
-7810
-7810
-10
UL
DP-DT Two SP-DT switches
12
5
3†

0.5**
0.25**
-7806
-7806
-06
UL
SP-DT one hermetically sealed switch
5
5

5**


-7810HM
-7810HM
-10HM

DP-DT two hermetically sealed SP-DT switches
5
5

5**


-7806HM
-7806HM
-06HM

DP-DT two SP-DT switches
10
3


10‡
3‡
-9806
-9806
-06

SP-DT one switch
10
3


10‡
3‡
-9810
-9810
-10

DP-DT two SP-DT switches
2
2


0.4**
0.25**
-1006
-1006
-06

SP-DT one switch
2
2


0.4**
0.25**
-1010
-1010
-10

†Available on special order, change 1st digit in ordering code from 4 to 5 or 7 to 8, i.e., -4820 becomes -5820, -7810 becomes -8810, etc.
‡10 amp inductive (polarized) at 125 VDC.
*Electrically Independent.
**Resistive.



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