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STRP
Seal & Temp-Stat Relay
Operation
The STRP monitors the seal and embedded
temperature sensor on submersible pump
motors. If the resistance in the seal area goes
lower than the set point or the temp-stat opens,
individual relay outputs will be energized, one
for a seal failure and one for a temp-stat failure.
2-Input Operation
To monitor the seal for a leakage, low voltage
is applied to the seal sensor. If the resistance
sensed falls below the adjustable trip point, the
seal fault output relay will be energized. High
resistance is considered “good”.
To monitor the temp-stat, low voltage is applied
to the normally closed contact. If the contact
opens, the temperature fault output relay will
be energized. A normally closed input is considered “good.”
1-Input Operation
An alternate input option is also built into the
STRP. With the 1-input option selected, if the
resistance is between 330Ω and 1,500Ω, both
the seal and temp-stat are considered “good”.
If the input resistance falls below 330Ω, a seal
fault is indicated and the seal fault output relay
will be energized. If the input resistance goes
above 1,500Ω, a high temperature fault is
indicated and the temperature fault output relay
will be energized.
Specications
Electrical
Supply Voltage:
12VDC & 24VDC
24VAC, 120VAC & 240VAC
Frequency: 50/60Hz
Power Consumption: 2VA
Inputs: 5VDC @ 2mA
2-Input:
Seal: Adjustable 5KΩ to 200KΩ,
+5KΩ Hystersis
Temp-Stat: 1NC Contact, Good condition
1-Input:
Resistance trip point xed at 330Ω & 1,500Ω
Seal Fault: <330Ω
Temp-Stat Fault: >1,500Ω
Contact Ratings:
Seal: 1NO
Temp-Stat: SPDT
10A @ 120VAC, 25°C
5A @ 277VAC
1/8HP @ 120/277VAC
5A @ 30VDC
Ordering Information
STRP - 120A - B - XXXX
R-K Model
Dimensions
3.88" 0.5" 2.0"
Cincinnati, OH
SEAL 100K GOOD
SEAL 2000K GOOD�
TEMP GOOD
GOOD
TEMP
STRP
Adjustments: (4) Membrane Buttons
Display: 16 Character, 2-line display,
with back light
Physical
Mounting: Panel Mounting: Through
the door
Termination:
Terminals: Pluggable Terminal Blocks
Packaging: Panel Mount
Weight: 1 Pound
Ambient Temperatures
Operating:
Terminal Blocks: -40°C to 60°C
(Display and membrane buttons may
not function below -20°C.)
Storage: -40°C to 85°C
Termination
B - Pluggable Terminal Blocks
Voltage
12D - 12VDC
24V - 24VDC
24A - 24VAC
120A - 120VAC
240A - 240VAC
3"
3.88"
Adjustments are available to:
• Select 1-Input or 2-Input operation
• Select the resistance on the 2-input operation
from 5KΩ to 200KΩ
• Select a Manual or Automatic reset after a
fault has been corrected.
5/25/16
Connections
Seal
Temp
NO
C
NCCNO
CST
L1
2-Input
L2
Seal
NO
CST
C
1-Input
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