801A Intelligent Alarm, Universal TC/RTD/mV Input by Acromag

Companies & Organizations:

United States of America

Acromag, Incorporated
30765 South Wixom Road
Wixom, Michigan 48393-2417 USA

- Thermocouple (J, K, T, R, S, E, B, N), RTD (Pt, Ni, Cu), millivolt (±100mV DC), resistance (0 to 500 ohms) input

- Single or dual mechanical relay alarm outputs

- 10-36V DC power

- Software configured

- Multi-function alarms (limit, window, deviation, rate-of-change, peak/valley detection)

- On/off controller capability


IntelliPack alarms compare inputs against user defined limit setpoints to control built-in relays. Each unit offers a selection of input ranges and alarm functions to handle a broad range of applications. As your needs change, you can easily reconfigure the unit for different ranges or functions. Alarm functions available on all models include on/off controller, limit alarm, window alarm, deviation alarm, rate-of-change alarm, and peak/valley detection.


Setup is very easy. IntelliPack alarms are configured through a user-friendly Windows XP and newer program. Field adjustments and recalibration are quickly performed with front-panel push-buttons and status LEDs. Once configured, IntelliPacks operate independent of any host computer.


General Input


Analog to Digital (A/D) Converter: 16-bit S-D A/D converter.

Resolution: ±0.005% of span or 0.1°C/ LSB. ADC typically yields resolutions finer than 0.1°C/LSB.

Ambient Temperature Effect: Better than ±0.005% of input span per °C or ±1μV, whichever is greater.

Noise Rejection: Normal Mode: Better than 40dB @ 60Hz. Common Mode: Better than 130dB @ 60Hz.

Input Filter: Normal mode filtering, plus digital filtering optimized and fixed per input range within S-D ADC.

Input Response Time: Less than 200mS to 98% of final value for a step change in the input. A software programmable delay can be implemented for filtering transients.

Relay Time Delay: Adjustable alarm delay of up to 25 seconds.

Input Overvoltage Protection: Bipolar Transient Voltage Suppressors (TVS).


DC Millivolt Input


DC Millivolt/Voltage Input Ranges: ±1.0V, ±500mV, ±250mV, ±125mV, ±62.5mV, ±31.25mV, ±15.625mV

Millivolt Accuracy: Better than ±0.05% of input span.


Thermocouple Input


Thermocouple Input Ranges: Thermocouple type user configured. Signal linearization, cold-junction compensation, and open circuit or lead break detection are included.


TC       °C Range (°F Range)                                   Accuracy

J          -210 to 760°C (-346 to 1400°F)                   ±0.5°C

K         -200 to 1372°C (-328 to 2502°F)                  ±0.5°C

T         -260 to 400°C (-436 to 752°F)                      ±0.5°C

R         -50 to 1768°C (-58 to 3214°F)                      ±1.0°C

S          -50 to 1768°C (-58 to 3214°F)                     ±1.0°C

E         -200 to 1000°C (-328 to 1832°F)                  ±0.5°C

B         260 to 1820°C (500 to 3308°F)                    ±1.0°C

N         -230 to 1300°C (-382 to 2372°F)                  ±0.5°C


RTD Input


RTD Input Ranges: 100W Pt, 120W Ni, or 10W Cu; user-configured.


RTD    °C Range (°F Range)                                   Accuracy

Pt1      -200 to 850°C (-328 to 1562°F)                   ±0.25°C

Pt2      -200 to 850°C (-328 to 1562°F)                   ±0.25°C

Ni        -80 to 320°C (-112 to 608°F)                       ±0.25°C

Cu       -200 to 260°C (-328 to 500°F)                     ±1.00°C


Alpha: Pt1 (a = 1.3850), Pt2 (a = 1.3911), Ni (a = 1.6720), Cu (a = 1.4272).

2, 3, or 4-wire configurations supported. Module provides sensor excitation, linearization, lead-wire compensation, and sensor break detection.

RTD Excitation Current: 1mA DC typical, all types.

RTD Lead-Wire Compensation: 25 ohms per lead.

RTD Break Detection: Configurable for either upscale or downscale.


Resistance Input


Resistance Input Range: 0 to 500 ohms.

Resistance Accuracy: ±0.05 ohms.




Relay (801A-0100 models): One DPDT electro-mechanical relay. Contact material Silver Nickel (AgNi 90/10).

Relays (801A-0200 models): Two independent SPDT electro-mechanical relays. Contact material Silver-Cadmium Oxide (AgCdO).

Relay Ratings (CSA ratings): 25V DC @ 5A. 120/240V AC @ 5A.

Expected Mechanical Life: 20 million operations.




Ambient Temperature

Operating: -25 to 70°C (-13 to 158°F).

Storage: -40 to 85°C (-40 to 185°F).

Relative Humidity: 5 to 95%.

Power Requirements: 10 to 36V DC. 55mA @ 24V. 75mA @ 15V.

Isolation: 3-way (input/output/power). 1500V AC for 60 seconds or 250V AC continuous.

Radiated Field Immunity (RFI): EN61000-4-3, EN50082-1.

Electromagnetic Field Immunity (EMI): No relay trips will occur beyond ±0.25% of input span from setpoint under the influence of electromagnetic fields from switching solenoids, commutator motors, and drill motors.

Electrical Fast Transient (EFT): EN61000-4-4, EN50082-1.

Surge Withstanding Capability (SWC): EN61000-4-5, EN50082-1.

Electrostatic Discharge (ESD): EN61000-4-2, EN50082-1.

Radiated Emissions: EN50081-1 for Class B equipment.

Approvals: UL, cUL listed (USA, Canada). UL3121 - general product safety.




Software Configuration: Units are fully programmable via the Windows XP or newer IntelliPack Configuration Program. Configuration downloads from PC through EIA232 serial port using Acromag 800C-SIP kit.

Field Configuration: Setpoint and deadband are configurable via push-buttons and a standard calibrator.

LED Indicators: LEDs indicate power, status, and alarm.




Enclosure: Case: Self-extinguishing NYLON type 6.6 polyamide thermoplastic UL94 V-2, color beige; general purpose NEMA Type 1 enclosure.

Connectors (Removable terminal blocks): Wire Range: AWG #14-22 (AWG #12 stranded only).

Printed Circuit Boards: Military grade FR-4 epoxy glass circuit board.


1.05W x 4.68H x 4.35D inches. 26.7W x 118.9H x 110.5D millimeters.

Shipping Weight: 1 pound (0.45 Kg) packed.




Features & Benefits


Integrated microcontroller performs intelligent signal processing for advanced alarm functions.

Windows XP/Vista/7 software configuration speeds setup and replacement.

Push-button reprogrammability facilitates changes in the field without a host PC.

Multi-purpose inputs accept numerous ranges to reduce spare stock requirements.

High-resolution Sigma-Delta A/D converter delivers high accuracy with low noise.

Input excitation supply on each input provides power for a two-wire transmitter.

Dual alarm operation lets you perform two alarm functions at the same time.

-25 to 70°C (-13 to 158°F) operation

Defense Products & Services: 801A Intelligent Alarm, Universal TC/RTD/mV Input by Acromag
Companies & Organizations: 
Defense Products & Services Sectors: Computers components
Description: 801A Intelligent Alarm, Universal TC/RTD/mV Input
Source of Information: Acromag Inc