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GAS MONITORS
MODELS 2050-00 & 2050-10
MODELS 2060-00 & 2060-10
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TABLE OF CONTENTS
SECTION
PAGE
1.PRODUCT DESCRIPTION
1.1 Introduction
1
1
1
1
2
2
2
1.2Application
1.3 Configuration
1.4 Temperature Range
1.5 Sensor
1.6 RemoteAlarm
2. QUICK START
2.1 Overview
2.2 Wiring
3
3
3
3. OPERATION
3.1 Introduction
3.2Alarms
4
4
4
4
3.3 Outputs
4. ALARM CALIBRATION
5
5
5
5
6
6
4.1 FactoryAlarm Calibration
4.2 Frequency ofAlarm Calibration Check
4.3 Alarm Calibration Check Process
4.4 Equipment Required
4.5 Alarm Calibration Procedure
5. SERVICE
5.1 Sensor Replacement
7
6. INSTALLATION
8
8
8
8
8
8
6.1 Gas Sensor Module Locations
6.2 Mounting
6.3 Wiring
6.4 Power Supply
6.5Alarm Devices
7. ALARM CONFIGURATION
8. SPECIFICATIONS
10
11
11
11
9. ACCESSORIES AND REPLACEMENT PARTS
10. LIMITED WARRANTY
Table of Contents
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Instruction Manual
1.0 PRODUCT DESCRIPTION
1.1 Introduction
Model
2050-00
2060-00
Gas
Ammonia
Halocarbons
TTL
X
X
Relay
X
X
The Model 2050 Ammonia and Model 2060 Refrigerant/
Halocarbon Gas Monitors are continuous duty, low cost
stationary monitors for detection of high levels (50-500
PPM) of ammonia and halocarbon ("freons") refrigerant
gases. See the specifications page for a full list of avail-
able applicable halocarbons
Table 1.1 Gas Monitor Configurations
This manual provides instructions for both the 2050 and
2060 series Gas Monitors, including the relay versions.
factory setpoint for R12 is 500 ppm while the setpoint
for R134 a is 50 ppm. See the specifications for more
details.
1.2 Application
The Model 2050 / 2060 is cross sensitive to other com-
bustible gases. If combustible gasses in excess of 50
ppm are expected in the area please contact Sierra Moni-
tor to determine amount of cross-sensitivity expected
for the specific combustible gas. It is not recommended
to use this unit in areas with combustible gases present.
These monitors are primarily used in and around freez-
ers, refrigerators, and compressor rooms to warn of leaks
and dangerous levels of these gases.
1.3 Configuration
An alarm is activated when the concentration of gas
exceeds the user-adjustable level. An alarm condition
activates the alarm light on the front of the monitor and
generates an output signal. On Models 2050-00 and the
2060-00 the output signal a TTL (Transistor-Transis-
tor-Logic signal) can activate a remote alarm through
one of Sierra Monitor’sAlarm Panels. (The Model 2102
Dual Channel Alarm Panel can be connected up to 500
feet from the monitors. ) The models can be config-
ured with a 0.5 amp, dry contact relay.
The monitors are housed in a
polystyrene enclosure that is suit-
able for installation in freezer, re-
frigerator or other applications.
Test connections and adjustment
controls are located on the out-
side of the enclosure and are eas-
ily used, even when the operator
is wearing hand protection.
The Model 2050 Ammonia moni-
tor has a factory alarm setpoint of
100 ppm NH3. This setpoint is
user adjustible in the field over a
range of 50 to 500 ppm NH3. The
Model 2050 calibration can be
checked with Hydrogen gas.
The Model 2060 Halocarbon
monitor can be calibrated with
carbon monoxide and the factory
setpoint varies for the specific
type of halocarbon present. The
Figure 1.1 Outline View - 2050/2060 Series
2050/2060 Gas Monitors (5/04)
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Instruction Manual
1.4 Temperature Range
The Model 2050 and 2060 have temperature compen-
sated circuitry to provide stabilization in temperatures
ranging from -4o to 158oF.
However, for optimum operation the unit should be cali-
brated at the normal temperature expected for the sensor
location.
1.5 Semiconductor-Type Sensor
A solid-state semiconductor-type sensor and associ-
ated electronic circuitry ensure trouble-free, long-term
operation. All the electronic circuitry needed to operate
the monitor, except the DC input power, is contained in a
compact unit. There are no pumps, filters, or chemical
cells to replace or maintain. Except for periodic calibra-
tion to verify the alarm setting, no attention is required
after installation. The user may adjust the alarm level by
applying a different calibration gas concentration.
A sensor self-check feature will flash the alarms on and
off alternatively should the sensor fail (open circuit).
The alarm flash includes LEDs, audible alarm, relay or
alarm signal as applicable.
1.6. RemoteAlarmAvailable
If a remote alarm is desired, Sierra Monitor’sAlarm Pan-
els, the Model 2102 Dual Channel Alarm Panels can be
connected up to 500 feet away from the monitors.
2050/2060 Gas Monitors (5/04)
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Instruction Manual
2.0 QUICK START
2.1 Overview
The Gas Sensor Module has been supplied factory
calibrated and ready for immediate installation and
operation. An installer familiar with installation and
operation of gas detection products can use this
section to begin immediate use of the monitor.
During warm-up the monitor will, first, cycle
through safe/alarm/safe condition at one hertz.
This will be followed by a short period of continu-
ous alarm before warm-up is completed.
2.2.4 Configuration
2.2 Wiring
The default configuration for each module is to
operate with a buzzer and a normally operating
open (NOO) relay. The user can change this con-
figuration using the jumpers provided. Refer to
table 6.2.
Each module requires four-conductor wiring (two
wires for power and two wires for the signal).
2.2.1. Model 2050-2060 Series
The Model 2050-2060 series are designed to
mount on any indoor vertical surface. Mount
the monitor in the desired location.
-
The installation must meet any hazard-
ous environmental codes for AC/DC elec-
trical instrumentation.
2.2.2 Wiring Connection
Terminal positions on the electronics board are
as follows:
Terminal
TB1-1
Function
+ VDC (9 – 24)
TB1-2
GND (0VDC)
TB2-1
Relay NC (Normally Closed) or
Output to Model 2102 Safe
Relay Common
Relay NO (Normally Open) or
Output to Model 2102 Alarm
Table 2.1
TB2-2
TB2-3
2.2.3 Start-up & Operation
To begin operation of the Gas Sensor Module
provide 9 - 24 VDC from a regulated power
supply such as one of the Sierra MonitorAlarm
Panels, 2102-XX. Each time the sensor mod-
ule is powered up it will perform a warm-up for
2 - 60 minutes.
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2050/2060 Gas Monitors (5/04)
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Instruction Manual
3.0 OPERATION
3.1 Introduction
Trouble Alarm
Under normal conditions the gas sensor module does
not require operator or technician intervention. The
following are conditions under which the module re-
quires attention:
Interrupted contact closure and “red/green” vi-
sual indication (once the warm-up time is com-
pleted) after unit has been in operation, indicat-
ing either a failed sensor or calibration problems.
- Routine periodic calibration
- Sensor replacement on a planned schedule
or when a sensor failure occurs.
Buzzer
Relay
Relay
Fail Safe
- Periodic cleaning as necessary.
On/Off
Oscilating
Oscilating
3.2 Alarms
Three alarm conditions are possible. These can be
detected visually at the optional Sierra Monitor con-
troller and at the module.
3.3 Outputs
For the non-relay configurations a 5 volt DC TTL
signal is provided to activate remote alarms such
as the Sierra MonitorAlarm Panels. Relay configu-
ration alarm conditions described above are trans-
mitted to the annunciator as relay contact closures
from the monitor.
Warm-Up Alarm
Oscillating (On/Off) contact closure and “red/
green” visual indication when power is first con-
nected to the module, followed by a continuous
closure of approximately 2-60 minutes indicat-
ing warm-up.
The alarm outputs are non-latching closed contacts.
As soon as the gas concentration falls below the
alarm set-point, the alarm will stop and the alarm
output will cause the relay to de-energize and the
contacts will open.
Buzzer
Relay
Relay
Fail Safe
During warm-up and failed sensor alarms the re-
lays contact and the display LED's oscillate at ap-
proximately one hertz.
On/Off
Oscilating
Oscilating
Gas Alarm
Sustained contact closure and solid red light
(once the warm-up time is completed) indicat-
ing the presence of gas at, or above, the pre-set
alarm limit.
Table 2.1
Buzzer
Relay
Relay
Fail Safe
On
Closed
Open
=
2050/2060 Gas Monitors (5/04)
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Instruction Manual
4.0ALARM CALIBRATION
of each gas sensor module be verified monthly dur-
ing the first three months of operation and then quar-
terly. More frequent checks are necessary during
periods of extreme humidity and temperature
changes. The monitor should have operated con-
tinuously (uninterrupted) for at least 24 hours prior
to calibration adjustment.
4.1 FactoryAlarm Calibration
The module has been factory calibrated to alarm as
indicated in Table 4.1 and as marked on the cali-
bration label shipped with the module.
Model
Time
Gas
cc/min
4.3AlarmCalibrationCheckProcess
2050-XX
2060-XX
100sec. 100 ppm NH3
50
The output signal of the gas sensor module is calibrated
using a calibration gas mixture containing a known
concentration of the gas of interest and a balance of air,
or using a substitute gas. The concentration of the span
gas must be equal to the alarm point desired.
60 sec. 500 ppm R11 50
500 ppm R12
50 ppm R22
50
50
100 ppm R113 50
70 ppm R123 50
50 ppm R134a 50
40 ppm R141b 50
40 ppm R142b 50
The equivalent substitute gas is 80 ppm Hydrogen (H2)
for the Model 2050 and 150 ppm Carbon Monoxide
(CO) for the Model 2060.
40 ppm R500
70 ppm R502
50
50
Calibration requires application of the span gas to the
sensor and adjustment of the sensitivity adjustment po-
tentiometer.
Table 4.1
Warning: During calibration the alarm will turn on and
remote alarms connected to the alarm relays will be
activated. Disable the remote alarm if necessary.
4.2 Frequency of Alarm Calibration Check
The manufacturer recommends that the calibration
Fig. 4-1 Location of Calibration Voltmeter Connections and Adjustments
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2050/2060 Gas Monitors (5/04)
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Instruction Manual
4.4EquipmentRequired
The following tools and equipment will be required for
calibration:
-JewelersScrewdriver
- Calibration Gas
- Calibration gas delivery system
For accurate calibration use a gas mixture at the re-
quired concentration mixed in an air balance, rather
than with an inert gas like nitrogen. This gas and the
required delivery equipment such as the Model 1200-
26 Calibrator is available from Sierra Monitor Corpo-
ration.
4.5Alarm Calibration Procedure
1. The monitor should be in the safe condition prior
to calibration (green LED “ON”).
-
Be sure that the area is non-hazardous be-
foreproceeding.
2. With the monitor in operation, expose the sensor
to a sample of calibration gas. Apply calibration
gas directly to the sensor insuring that the delivery
cup loosely covers the sensor. Use 80 PPM H2 for
the Model 2050 and 150 PPM CO for the Model
2060.
3. The red LED on the face of the monitor should turn
"on". If the alarm occurs within 18-20 seconds and
stops within one minute of the removal of the cali-
bration gas, the monitor is in calibration and re-
quires no further adjustment.
4. If the monitor fails to alarm within 90 seconds of
the application of the gas adjust the potentiometer
counter clockwise until the alarm turns "on".
5. If the monitor fails to stop alarming within one
minute of the removal of the gas adjust the poten-
tiometer clockwise until the alarm stops.
6. After adjustment, repeat steps 4 and 5 to verify cali-
bration.
7. When the calibration is complete, reconnect any
alarm equipment as necessary.
2050/2060 Gas Monitors (5/04)
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Instruction Manual
5.0 SERVICE
5.1 Sensor Replacement
The gas sensor needs replacement when:
2. Remove the cover from the main enclosure.
3. Unplug the sensor connector on the lower
right hand corner of the electronics board.
-
-
-
It is no longer possible to obtain correct
calibration
4. Unscrew the sensor assembly from the end of the
enclosure.
The failed sensor alarm (oscillating
red/green LED) is on
5. Reverse the preceding steps to install the new sen-
sorassembly.
The sensor output signal is noisy,
causingincorrectgasalarms.
6. Restore power and allow a minimum of 24 hours
for stabilization before recalibration. The calibra-
tion should be re-verified after 6 days of continu-
ous operation.
To replace the sensor:
1. Confirm that the system power has been
removed.
Figure 5-1 Model 2050/2060 Electronics Board Connections
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2050/2060 Gas Monitors (5/04)
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Instruction Manual
6.0 INSTALLATION
6.1 Gas Sensor Module Locations
6.4 Power Supply
The gas sensor module is a diffusion type sensor
that should be located close to the anticipated source
or destination of the gas hazard. For heavy gases
such as H2S install the module within 24 inches of
the ground. For lighter gases such as CO and com-
bustible gases use a higher elevation.
The power supplied by the controlling device or an
external power supply must meet the following speci-
fications:
Voltage:9 - 24 VDC
Current: 250 mA
After optimum locations are determined based on 6.5Alarm Devices
the above recommendations, consideration should
be given to placing the sensors in locations that are
accessible for calibration service. Slight adjustments
to the location of the sensor may have little impact
on effectivity but major effect on accessibility.
The internal relay is rated at 0.5Amp, normally open
dry contact rated at 100 VDC/130 VAC.
6.2 Mounting
To mount the monitor, remove the four svrews in the
cover plate and move the cover plate aside. Use
screws through the monitoring holes visible in the
four corners of the housing to mount the monitor to
a wall.
- The installation must meed any hazardous envi-
ronmental codes forAC/DC electrical instrumenta-
tion.
6.3 Wiring
Interconnect wiring from the controller to the module
is by 4 conductor 22 AWG (or lower AWG) cable,
conduit as necessary. Shielding is not required.
For installations where the distance from the con-
troller to the sensor is greater than 500 feet, 18
AWG cable is recommended.
Terminal
Function
TB1-1
TB1-2
TB2-1
+ VDC (9 – 24)
GND (0VDC)
Relay NC (Normally Closed) or
Output to Model 2102 Safe
Relay Common
Relay NO (Normally Open) or
Output to Model 2102 Alarm
Table 6.1
TB2-2
TB2-3
The terminal strip on the electronics board in the
module. The wiring must be connected as indi-
cated in Figure 6.1 depending upon the controller
or relay configuration being used.
2050/2060 Gas Monitors (5/04)
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Instruction Manual
Figure 6.1
Interconnect Wiring Table
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2050/2060 Gas Monitors (5/04)
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Instruction Manual
7.0 ALARM CONFIGURATION
Model 20X or 200X Configured with Alarm Relay Output
Configuration Jumpers
Relay Operation
Normally
Buzzer Active
Yes No
Default
Install Jumper Remove Jumper
Normally
Energized
Not Energized
Default
Install Jumper
JP2 pins 1-2
Install Jumper
JP2 pins 2-3
JP6
JP6
(Best for 20X)
Wiring Terminations
Power Supply
Output Terminals
TB1-1
+ DCV
TB1-2
0 DC
TB2-1
NC
TB2-2
Common
TB2-3
NO
(9-24 VDC)
Common
Model 20X or 200X Configured for Interface to Model 2102 Alarm Panel
Configuration Jumpers
Buzzer Active
Yes No
Default
Install Jumper Remove Jumper
Relay Operation
Interface Selection
Normally
Normally
Model 2102
Not Energized
Default
Energized
N/A
N/A
Install Jumpers
JP3 pins 1-2
JP2 pins 1-2
JP6
JP6
(Best for 20X)
Wiring Terminations
Output Terminals
Power Supply
TB1-1
+ DCV
TB1-2
0 DC
TB2-1
Safe
TB2-3
Alarm
TB2-2
To Model 2102 To Model 2102 To Model 2102
To Model 2102
Not Used
Terminal J5 -2 Terminal J5 -3 Terminal J5 -1 Terminal J5 -4 or
or J6-2 or J6-3 or J6-1 J6-4
Table 6.2
Jumper Configuration and Wiring Terminations
Relay Operation
Normally Not Energized
TB2-1 NC
Connected
Oscillating
Connected
TB2-2 Common
TB2-3 NO
No Power
Sensor Fail
Safe
Open
Open
Alarm
Open
Connected
Normally Energized - Fail Safe
TB2-1 NC
Open
TB2-2 Common
Connected
TB2-3 NO
Open
No Power
Sensor Fail
Safe
Oscillating
Connected
Alarm
Connected
Open
Table 6.3
Relay Operating States
2050/2060 Gas Monitors (5/04)
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Instruction Manual
8.0 SPECIFICATIONS
Calibration Gas:
2050 Series
Indicators:
Green LED for Monitor “ON”/Safe
Red LED for Alarm
80 ppm Hydrogen (H2)
150 ppm Carbon Monoxide (CO)
2060 Series
Sensor Type:
Solid-state metal oxide semiconduc-
tor
Power:
9 VDC, 250 mA
Signal Output::
2050-00/2060-00
Alarm Setpoint::
2050 Series
Nominal 5 volt DC, source 25 mA.
SAFE and ALARM Signals
0.5 AMP dry contact, 100 VDC, 130
VAC
100 ppm NH3
2060 Series
R11
R12
R22
R113
R123
R134a
R141b
R142b
R500
R502
500 ppm
500 ppm
50 ppm
100 ppm
70 ppm
50 ppm
40 ppm
40 ppm
40 ppm
70 ppm
Response Time:
Less than 90 seconds
Operating Temperature Range:
-4 to 158 F (-20 to 70 C)
Enclosure Material: Polystyrene
o
o
o
o
Size:
5.6 x 3.1 x 2.1 in.
(14.2 x 7.9 x 5.3 cm)
0.3 lb (0.15 Kg)
Weight:
User adjustable with calibration over
range of 50 to 500 ppm
9.0 ACCESSORIES AND REPLACEMENT PARTS
Alarm Panels
Replacement parts
Model 2102-00 Alarm Panel - 2 channel
Model 2102-01 Alarm Panel - 2 channel with audible
SPF22073
SPF22074
Sensor for 2050-XX
Sensor for 2060-XX
CalibrationAccessories
1200-26 Gas Sensor Calibrator w/2 gas cylinders
(specify gas type/conc)
1290-10 Gas Cylinder - Carbon Monoxide 150 PPM
1290-11 Gas Cylinder - Hydrogen 80 PPM
10.0 LIMITED WARRANTY
In all cases SMC’s responsibility and liability under this
warranty shall be limited to the cost of the equipment. The
purchaser must obtain shipping instructions for the prepaid
return of any item under this warranty provision and com-
pliance with such instruction shall be a condition of this
warranty.
SIERRAMONITOR CORPORATION warrants its products
to be free from defects in workmanship or material under
normal use and service for two year after date of shipment.
SMC will repair or replace without charge any equipment
found to be defective during the warranty period. Final
determination of the nature and responsibility for defective
or damaged equipment will be made by SMC personnel.
Exceptfortheexpresswarrantystatedabove, SMCdisclaims
all warranties with regard to the products sold hereunder
including all implied warranties of merchantability and fit-
nessandtheexpresswarrantiesstatedhereinareinlieuofall
obligations or liabilities on the part of SMC for damages
including but not limited to consequential damages arising
out of/or in connection with the use or performance of the
product.
All warranties hereunder are contingent upon proper use in
the application for which the product was intended and do
not cover products which have been modified or repaired
without SMC approval or which have been subjected to
accident, improper maintenance, installation or application,
or on which original identification marks have been re-
moved or altered. This Limited Warranty also will not apply
to interconnecting cables or wires, consumables (ie. calibra-
tion gases, batteries), nor to any damage resulting from bat-
tery leakage.
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2050/2060 Gas Monitors (5/04)
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