Switch Configurations:
The Model 220 indicating / non-indicating differential
pressure switch is configured with one of the outputs
identified in the table below.
OUTPUT RATINGS (Resistive Load)
Type
SPST
SPDT
SPDT
DPDT
Relay
ELEC Spec.
A
A
A
B,C,D,E,F,
G, H
Output
Option Code
E, F, or G
H
A
R
*Power
60 W
60 W
3W
N/A
Max. Current 3 Amps
1.0 Amps
0.25 Amps
10 Amps
Max. Volts
VAC/ VDC
240
240
125
277 / 30
Setting
(F.S.)
15% to 90% 25% to 90% 10% to 90% 15% to 90%
Hysterisis
(Max/Nom)
20% / 9%
Full
Scale(F.S.)
20% / 18%
Full
Scale(F.S.)
10% / 6%
Full
Scale(F.S.)
20% / 10%
Full
Scale(F.S.)
Repeatability 1% F.S.
1% F.S.
1% F.S.
1% F.S.
Table I
* Product of the switching voltage and current shall not
exceed the power rating of the device.
Hermetically Sealed Switch Outputs:
Electrical Specification Input Option “A” identifies that your
unit does not need input power to operate the switch output
and that your unit is equipped with Hermetically Sealed Reed
switches. The “A” option matched with Output Options A, E,
& H identifies the output capability of your unit. Depending on
the electrical configuration specified on the order (A, B, R, or
S), your unit will be equipped with 1 or 2 independently
adjustable reed switches.
Interface to the 16 position terminal strip shown in Figure 3 is
defined in Table II.
Terminal Connections
Electrical
Options
Qty
Sw.
Function
Switch Adjust
Low Port
Switch Adjust
Hi Port
RAA, RAH
1
SPDT
1(COM), 2(NO),
3 (NC)
No Connection
SAA, SAH
2
SPDT
1(COM), 2(NO)
3 (NC)
8(COM), 7(NO)
6 (NC)
RAE
1
SPST
NO
1,2
No Connection
RAF
1
SPST
NC
1,3
No Connection
SAE
2
SPST
NO
1,2
8,7
SAF
2
SPST
NC
1,3
8,6
SAG
2
SPST 1
NO, 1NC
1, 3 NC
8, 7 NO
Table II
Chassis connection is to position 12 or 13
.
Customer Interface for the Reed Switch Output Option will be
via connections 1 through 8 and connections 12 or 13. Do
not loosen the connections at positions 9, 10, 11, 14, 15 , or
16.
All switch types are field adjustable. The defined range of the
adjustment is specified in Table I above. All switches come
with a decal to identify adjustment direction to increase the
set point.
Do not
use excessive force when rotating the
adjustment screw as the adjustment mechanism may be
damaged
(See Figure 4).
Note:
Switches can be set below the defined minimum set
point however, the switch may not remain activated at
maximum PSID.
If the unit is set below the defined minimum
set point, the customer should verify that the switch remains
activated from the set point to full over range of the gauge.
Provide standard protection techniques for the switch
contacts for capacitive and inductive loads. Use current
limiting techniques near the switch to protect the contacts
due to high inrush (i.e.; in line resistor or inductor) for long
cable interfaces. Provide clamping devices at or near
inductive loads (i.e.; relay).
Maximum wire length between
the 3W switch and its load, should not exceed 70 – 100
Feet
.
for 120 VAC
applications. Contact the factory for
assistance regarding this condition.
FIGURE 4
Figure 3: Reed Switch Terminal Strip Output Interface
Customer
Interface
Low
Port
High
Port
Switch
Adjust
Low Port
High Port
Protective
Terminal
