Lake Shore Model 218 Temperature Monitor User’s Manual
1-4
Introduction
1.2 MODEL
218
SPECIFICATIONS
Thermometry
Number of Inputs:
8
Input Configuration:
Two groups of four. Each group must contain same input type
Measurement Type:
Four-lead differential
Excitation:
Eight constant current sources
Supported Sensors (temp. range): Silicon Diode, GaAlAs Diode, RTDs: 100
Ω
Platinum, 1000
Ω
Platinum,
Germanium,
Carbon
Glass, Cernox, ROX
Accuracy/Resolution:
Refer to Table 1-2
Maximum Update Rate:
16 readings per second total
Standard Curves:
DT-470, DT-670, CTI-C, DT-500D, PT-100, PT-1000
User Curves:
Room for eight (one per input). 200 point maximum for each
Soft Cal™:
Improves accuracy of DT-470 diode to ±0.25 K from 30 K to 375 K. Improves
accuracy of Platinum RTDs to ±0.25 K from 70 K to 325 K. Stored as user curves
Math:
Maximum, Minimum, and Linear Equation
Filter:
Averages 2 to 64 input readings
Front Panel
Display:
4 line by 20 character backlit LCD display
Number of input displays:
1 to 8
Display Units:
K, C, V,
Ω
Display Update Rate:
All displayed inputs twice in one second
Temperature Display Resolution:
0.001° between 0° to 99.999°, 0.01° between 100°
to 999.99°, 0.1° above 1000°
Sensor Units Display Resolution:
Sensor dependent, to 5 digits
Display Annunciators:
Remote (R), Alarm (A), Data Logging (D), Max (>), Min (<), Linear (/)
Keypad:
20-Key membrane, numeric and specific functions
Front Panel Features:
Front panel curve entry and keypad lock-out
Interface
IEEE-488.2 Interface (218S Only): SH1,AH1,T5,L4,SR1,RL1,PP0,DC1,DT0,C0,E1
Serial Interface:
RS-232C Electrical, DE-9 Connector, 9600 BAUD
Printer Capability:
Support for serial printer through serial interface. Used with Data Log parameters
Alarms:
Number:
16 – High and low for each input
Data
Source:
Temperature,
sensor units, linear equation
Settings:
Units, High Setpoint, Low Setpoint, Deadband, Latching or Non-Latching,
Audible on or off
Actuators:
Display annunciator, beeper, relays (218S)
Relays (218S Only):
Number:
8
Contacts:
Normally Open (NO), Normally Closed (NC), and Common (C)
Contact Rating:
30 VDC at 5 A
Operation:
Each input may be configured to actuate any or all of the 8 relays. Relays
may be activated on high, low, or both alarms for any input, or manually
Corrected Analog Output (218S):
Scale:
User
selected
Range:
±10
V
Resolution:
1.25
mV
Accuracy:
±2.5
mV
Minimum Load:
1 k
Ω
Data Logging
Readings: 1
to 8 per record
Operation:
Store Data Log records in memory or send them to the printer. Users may
display, print, or retrieve stored data by computer interface
Data memory:
Maximum of 1500 single reading records, non-volatile
General
Ambient Temperature:
15 to
35 °C at rated accuracy. 10 to 40 °C at reduced accuracy
Power Requirement:
100, 120, 220, 240VAC, +6% –10%, 50 or 60Hz, 18 VA
Size:
217 mm W × 90 mm H × 317.5 mm D (8.5 × 3.5 × 12.5 in.), half rack
Weight:
3 kilograms (6.6 pounds)
Approval:
CE Mark (contact Lake Shore for availability)
