CTC LP902 Intrinsically Safe Loop Power Sensor Owner’s Manual
- June 13, 2024
- CTC
Table of Contents
CTC LP902 Intrinsically Safe Loop Power Sensor
Introduction
4-20 mA Vibration Monitoring Process Overview
4-20 mA technology can be used to measure temperature, pressure, flow and
speed, as well as the overall vibration of rotating machines. Adding a
vibration sensor/transmitter to the machine provides a critical measure of the
machine’s health. It can be used to identify changes in balance, alignment,
gears, bearings, and many other potential faults. The purpose of the 4-20 mA
analog current loop is to transmit the signal from an analog vibration sensor
over a distance in the form of a 4-20 mA current signal. The current signal
generated is proportional to the overall vibration of the equipment or
machinery that is being monitored. This output current has a range of 4-20 mA,
with 4 representing the minimum and 20 representing maximum amplitudes (within
the range of 4-20 mA). The 4-20 mA signal output is proportional to the
overall amplitude generated within a defined frequency band. Therefore, the
signal does not include data from frequencies outside the frequency band but
includes all vibration (critical and non-critical faults) within that band.
LP902 Series Overview
Each LP902 sensor that is approved for IS must meet or exceed the requirements
for standards recognized by the countries that would use the sensors.
Specific Conditions of Use:
Specific ambient conditions of use include -40°F to 176°F (-40°C to 80°C) for
all LP Series
Special Conditions for Safe Use:
None
Intrinsically Safe Information
Compliance with the Essential Health and Safety Requirements
Assured by compliance with EN60079-0:2004, EN60079-11:2007, EN60079- 26:2007,
EN61241-0:2006, EN61241-11:2007
ATEX Related Nameplate Markings
The following is a complete recapitulation of ATEX nameplate markings so the
customer has complete ATEX information for specific conditions of use.
Class 1 Div 1 (Zone 0) Labeling
INTRINSICALLY SAFE SECURITE INTRINSEQUE
Ex ia IIC T3 / T4
Ex iaD A20 T150 °C (T-Code = T3) / T105 °C (T-Code = T4)
DIP A20 IP6X T150 °C (T-Code = T3) / T105 °C (T-Code = T4)
AEx ia IIC T3 / T4
AEx iaD 20 T150 °C (T-Code = T3) / T105 °C (T-Code = T4)
CLI GPS A,B,C,D
CLII, GPS E,F,G, CLIII
CLI, ZONE 0, ZONE 20
OPERATING TEMP CODE: T4
AMBIENT TEMP RANGE = -40 °C TO +80 °C
CONTROL DRAWING INS10012
Ex ia IIC T3 -54 °C < Ta < +125 °C
Ex ia IIC T4 -40 °C < Ta < +80 °C
Ui=28Vdc Ii=100mA
Ci=70nF Li=51µH Pi=1W
CSA 221421
KEMA 04ATEX1066
LP80, and LP90 Series – Temperature Code: T4 Ambient temperature range = -40
°C to 80 °C
Product Specifications
| Power Input | 15-30 Vdc supply voltage required |
|---|---|
| Band-Pass Filter | The vibration sensor contains a band-pass filter, consisting |
of a low-pass and a high-pass .
Analog Output| Full-scale output of 4-20 mA
Operation| Filters the signal, and normalizes the output to the specified
full-scale output . Performs a true RMS conversion and transmits this data in
a 4-20 mA format (if RMS is chosen) .
Temperature Range| -40°F to 176°F (-40°C to 80°C)
Dimension Drawings
Wiring
The Intrinsic Safety Control Drawing INS10012 below shows the installation
requirements for CTC IS Sensors. As shown, properly installed barriers are
required to limit the energy the sensor can receive. Cabling brings the signal
from the sensor to the Zener diode barrier or galvanic isolator, which is the
energy-limiting interface. The signal is transferred through the barrier
(which can be located in a Class I Div 2 or non-hazardous area) to measurement
equipment, such as a data collector or junction box, for further processing.
Notes
- Unspecified barrier strip shown
- See safety barrier manufacturer installation manual for information on proper wiring of sensor cables to the terminal blocks of the safety barrier
- Wire color for clarity only
Loop Resistance Calculations
Standard Loop Powered Sensors
*Intrinsically Safe Loop Powered Sensors
*Note: Typical Loop Powered Circuit will include an Intrinsically Safe Barrier in the Circuit
Power Source Voltage (VP)| Typical RL (max) (Non-IS Sensors)| Typical RL (max)
(IS Sensors)
---|---|---
20| 250| 100
24| 450| 300
26| 550| 400
30| 750| 600
Measurement
Full-Scale Measurement Range| Actual Vibration, IPS| Expected
Output (mA)
---|---|---
0 – 0.4 IPS (0 – 10 mm/s)| 0| 4
0 .1 (2 .5 mm/s)| 8
0 .2 (5 .0 mm/s)| 12
0 .3 (7 .5 mm/s)| 16
0 .4 (10 .0 mm/s)| 20
0 – 0.5 IPS| 0| 4
0 .1| 7 .2
0 .2| 10 .4
0 .3| 13 .6
0 .4| 16 .8
0 .5| 20
0 – 0.8 IPS (0 – 20 mm/s)| 0| 4
0 .2 (5 .0 mm/s)| 8
0 .4 (10 .0 mm/s)| 12
0 .6 (15 .0 mm/s)| 16
0 .8 (20 .0 mm/s)| 20
0 – 1.0 g (LP900 Series)| 0| 4
0 .1| 5 .6
0 .25| 8
0 .5| 12
0 .75| 16
1| 20
0 – 2.0 g (LP900 Series)| 0| 4
0 .25| 6
0 .5| 8
0 .75| 10
1| 12
1 .25| 14
1 .5| 16
1 .75| 18
2| 20
Installation
Hand tighten the sensor to the mounting disk and tighten using 2 to 5 ft-lbs of mounting force.
- The mounting torque is important to the frequency response of the sensor for the following reasons:
- If the sensor is not tight enough, proper coupling between the base of the sensor and the mounting disk will not be achieved.
- If the sensor is over tightened, stud failure may occur.
- A coupling agent (such as MH109-3D epoxy) will maximize the high frequency response of your hardware, but is not required.
Permanent/Stud Mounting Surface Preparation
- Prepare flat surface using a spot face tool and pilot drill hole using a CTC spot face installation tool.
- The mounting surface should be clean and free from any residue or paint.
- Tap for required thread ( ¼-28 or M6x1).
- Install sensor.
– Suggested Installation Tool Kit: MH117-1B
Warranty and Refund
Warranty
All CTC products are backed by our unconditional lifetime warranty. If any CTC
product should ever fail, we will repair or replace it at no charge.
Refund
All stock products can be returned for a 25% restocking fee if returned in new
condition within 90 days of shipment. Stock products qualify for free
cancellation if your order is cancelled within 24 hours of purchase. Built-to-
order products qualify for a 50% refund if returned in new condition within 90
days of shipment. Custom products are quoted and built specifically to the
requirements of the customer, which may include completely custom product
designs or private labeled versions of standard products for OEM customers.
Custom products ordered are non-cancellable, non-returnable and non-
refundable.
