Form 270
Warrick® Series 27 Controls
*** WARNING
Important!
Before proceeding to install and wire the control, Read and thoroughly understand these instructions.
Location
Wiring:
(See applicable wiring diagram in
this bulletin)
on the supply line
Note:
27 - X-X - X -X
Enclosure
Sensitivity (Ohms)
Voltage
Mode of Operation
Grounding:
Bulletin No 100274-1
Rev. L
Installation and Operation Bulletin
This bulletin should be used by experienced personnel as a guide to the installation of series 27. Selection or installation of equipment should always be accompanied by competent technical assistance. We
encourage you to contact Gems Sensors or its representative if further information is required.
When installing according to these instructions, the sensing circuit
is intrinsically safe for Class I, Groups A, B, C and D; Class II,
Groups E, F and G; Class III:
Electrical equipment connected to associated apparatus should not
exceed maximum voltage marked on product.
: The control must be situated in a non-hazardous area
where an explosive atmosphere will not exist at any time.
1. Intrinsically safe wiring must be kept separate from nonintrinsically safe wiring.
2. Intrinsically safe and non-intrinsically safe wiring may occupy
the same enclosure or raceway if they are at least 2 inches
(50mm) apart and separately tied down. Inside panels, field
wiring terminals for intrinsically safe circuits must be separated
by at least 2 inches (50 mm) from non-intrinsically safe terminals.
3. Wire the control device (s) to the Series 27 relay as shown in the
specific application wiring diagram in this bulletin. A separate
rigid metallic conduit should be used to enclose the conductors
of the intrinsically safe control circuit.
4. An approved seal should be used at the point where the intrinsically safe control circuit wiring enters the hazardous area.
For intrinsically safe output wiring, use #14 or #16 AWG type MTW or
THHN wire. By using these wire types in conjunction with the following distance recommendations, you will not exceed the maximum
capacitance for field wiring. Use the following chart as a guide for
maximum wire runs for differential level service (3wire) field wiring.
: To prevent ignition of flammable or combustible atmospheres, disconnect power before servicing.
Model
Max.
Sensitivity
(K Ohms)
Distance
(FT.)
One of the two grounding terminals provided on the intrinsically safe output
terminal strip must be connected as reference to the same conductive
media presented to terminals “H” and “L”
redundant system ground terminal and should be connected to the earth
ground buss of the control’s AC supply line feeder.
1. Intrinsically safe terminals can be connected to any non-energy gen-
2. To prevent electrical shock from supply line/load side powered con-
3. For additional guidance on “Hazardous Location Installation” and
connection for earth grounding between the control’s internal solid
state circuitry and the enclosure chassis. To insure proper grounding, use only metal screws and lock washers when mounting this
control.
Terminal G
erating or storing switch device such as a pushbutton, limit or float
type switch or any Warrick electrode and fitting assembly.
nections, Series 27 should be mounted in a tool accessible enclosure
of proper NEMA rated integrity.
“Intrinsically Safe Devices”, consult ANSI/ISA standard RP 12-6 or
NEC articles 500-516.
Both mounting tabs of the Series 27 provide an electrical
: 0- none, 1- NEMA 1, 4- NEMA 4
: 1- 120 VAC, 2- 240 VAC
/load side terminal strip is a
: D- 3K, E- 10K, H- 24K, G- 100K
: A- Direct, B- Inverse
27XXD0 3 4,000
27XXE0 10 900
27XXH0 24 800
27XXG0 100 75
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Contact Design
Wiring diagram
Single Level Service
-Conductance Actuated
Note: Jumper must be installed as shown to insure proper Operation.
Wiring diagram
Differential Level Service
-Conductance Actuated
SPDT (1 form C): One normally open (N.O.) and one
normally closed (N.C.), non-powered contacts
Contact Ratings: 8A @ 240 VAC resistive,
8Amps @ 30 VDC resistive
Contact Life
Mechanical: 10 million operations.
Electrical: 100,000 operations minimum at rated load
Electronic Module
Solid state components epoxy encapsulated in a
black nylon shell
Supply Voltage
120 or 240 VAC models ±10%, 50/60 Hz.
Supply Current
Relays energized - 1.7 VA.
W
1. Connect (both terminals AC, AC) and G to appropriate VAC supply line.
2. Install metallic jumper between terminal H and L.
3. Connect terminal L to the electrode.
Terminal G must be grounded to the tank if metallic.
When the tank is non-metallic, terminal G must be
connected to an additional electrode of length equal to
the longest electrode.
4. Wire contacts (C-NO) normally open and (C-NC)
normally closed into load circuit as required.
Secondary Circuit
11 VAC RMS voltage on probes, 2.3 milli-amp
current
Sensitivity
Models operate from 0-100,000 ohms maximum specific resistance (factory set)
Temperature
-40° to 150° F ambient
Terminals
Size 6 pan head screws with captivated wire
clamping plate
Listings
U.L. Intrinsically Safe (UL 913)
1. Connect (both terminals AC, AC) and G to appropriate VAC supply line.
2. Connect terminal H to the electrode and terminal L to low electrode.
Terminal G must be grounded to the tank if metallic.
When the tank is non-metallic, terminal G must be
connected to an additional electrode of length equal to
the longest electrode.
3. Wire contacts (C-NO) normally open and (C-NC)
normally closed into load circuit as required.
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W
Wiring diagram
Single Input (Non Latching)
-Pilot Contact Actuated
Note: Jumper must be installed as shown to insure proper Operation.
Gems Sensors & Controls
Wiring diagram
Dual Input Latching
-Pilot Contact Actuated
1. Connect (both terminals AC, AC) and G to appropriate VAC supply line.
2. Install metallic jumper between terminal H and L.
3. Wire contacts (C-NO) normally open and (C-NC)
normally closed into load circuit as required.
4. Connect the pilot contact to terminals G and L.
1. Connect (both terminals AC, AC) and G to appropriate VAC
supply line.
2. Wire contacts (C-NO) normally open and (C-NC)
normally closed into load circuit as required.
3. Connect the latch pilot contact to terminals G and H and
the unlatch Pilot contact to terminal G and L
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