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INSTALLATION

Run wire to be monitored through opening in the sensor. Be sure the 

monitored current flows in the same direction as the arrow on the sensor. The 

arrow is just above the hinge, with the “+” symbol on the left, the “-” symbol on 

the right. The CTD transducers work in the same environment as motors, 

contactors, heaters, pull-boxes, and other electrical enclosures. They can be 

mounted in any position or hung directly on wires with a wire tie. Just leave at 

least one inch (25.4 mm) distance between sensor and other magnetic devices.

Split-Core Versions

Press the tab in the direction as shown to open the sensor. After placing the 

wire in the opening, press the hinged portion firmly downward until a definite 

click is heard and the tab pops out fully.

KEEP SPLIT-CORE SENSORS CLEAN.

Silicone grease is factory applied on the mating surfaces to prevent rust and 

improve performance. Be careful not to allow grit or dirt onto the grease in the 

contact area. Operation can be impaired if the mating surfaces do not have good 

contact. Check visually before closing.

INPUT AND OUTPUT WIRING

Connect control or monitoring wires to the sensor. Use 30 to 12 AWG copper 

wire rated at 75 °C. Terminals should be tightened to 5 to 7 in-lbs torque.

4-20mA:

The current loop is powered by the CTD Transducer.
Maximum loop impedance is 650 

.

RANGE SELECT

CTD transducers feature field selectable ranges. The ranges are factory 

calibrated, eliminating time consuming and inaccurate field setting of zero or 

span.

1. Determine the normal operating amperage of your monitored circuit.
2. Select the range that is equal to or slightly higher than the normal operating 

amperage.

3. Place the range jumper in the appropriate position.

TROUBLE SHOOTING 

1. Output Signal Too Low

A. The jumper may be set in a range that is too high for current being 

monitored. Move jumper to the correct range.

B. Power supply is inadequate. Check power supply. Make sure it is of 

sufficient voltage with all loads at maximum. CTD Series draw 2.0 VA.

C. Output load too high. Check output load, be sure it is no more than 650 

.

2. Output Signal is always at maximum

A. The jumper may be set in a range that is too low for current being 

monitored. Move jumper to the correct range.

3. Sensor has no output

A. Polarity is not properly matched. Check and correct wiring polarity

B. Monitored load is not DC or is not on. Check that the monitored load is 

DC and that it is actually on.

C.Split Core models: The core contact area may be dirty. Open the sensor and 

clean the contact area.

RED LION CONTROLS TECHNICAL SUPPORT

If for any reason you have trouble operating, connecting, or simply have 

questions concerning your new unit, contact Red Lion’s technical support.

Support: 

support.redlion.net

Website: 

www.redlion.net

Inside US: +1 (877) 432-9908

Outside US: +1 (717) 767-6511

ORDERING INFORMATION

MODEL NO.

DESCRIPTION

PART NUMBERS

CTD

DC/DC, Split Case

CTD00000

Important!

Keep Contact 

Area CLEAN!

To Open 

Press Tab 

Toward Hinge.

C

ONNECTION

 

N

OTES

:

Deadfront captive screw
terminals.
30–12 AWG solid or stranded.
Observe polarity.

Output loop is powered by

CTD Transducer. No loop power

supply required.

24VAC/DC

LIMITED WARRANTY

(a) Red Lion Controls Inc. (the “Company”) warrants that all Products shall be free from defects in material and workmanship 

under normal use for the period of time provided in “Statement of Warranty Periods” (available at www.redlion.net) current at the 

time of shipment of the Products (the “Warranty Period”). 

EXCEPT FOR THE ABOVE-STATED WARRANTY, COMPANY 

MAKES NO WARRANTY WHATSOEVER WITH RESPECT TO THE PRODUCTS, INCLUDING ANY (A) 

WARRANTY OF MERCHANTABILITY; (B) WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE; OR (C) 

WARRANTY AGAINST INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OF A THIRD PARTY; 

WHETHER EXPRESS OR IMPLIED BY LAW, COURSE OF DEALING, COURSE OF PERFORMANCE, USAGE OF 

TRADE OR OTHERWISE.

 Customer shall be responsible for determining that a Product is suitable for Customer’s use and that 

such use complies with any applicable local, state or federal law. 

(b) The Company shall not be liable for a breach of the warranty set forth in paragraph (a) if (i) the defect is a result of Customer’s 

failure to store, install, commission or maintain the Product according to specifications; (ii) Customer alters or repairs such 

Product without the prior written consent of Company.

(c) Subject to paragraph (b), with respect to any such Product during the Warranty Period, Company shall, in its sole discretion, 

either (i) repair or replace the Product; or (ii) credit or refund the price of Product provided that, if Company so requests, Customer 

shall, at Company’s expense, return such Product to Company.

(d) 

THE REMEDIES SET FORTH IN PARAGRAPH (c) SHALL BE THE CUSTOMER’S SOLE AND EXCLUSIVE 

REMEDY AND COMPANY’S ENTIRE LIABILITY FOR ANY BREACH OF THE LIMITED WARRANTY SET 

FORTH IN PARAGRAPH (a).

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